LIST OF TABLES

Table 1 : Areas (Km²) of fishing grounds by bottom type and depth zone (FAO 1979b) statistical division 34.3.5
INSHORE (0 – 50 M)			Nigeria	Cameroon	Equatorial Guinea	TOTAL
	Soft (muddy to Sandy-muddy)	0 – 10 m	5100	3400		8500
		10 – 50 m	20650	4250	1850	26750
		Total
		0 – 50 m	25750	7650	1850	35250
	Hard and Sandy	0 – 10 m
		10 –50 m	950	950		1900
		Total
		(0–50m)	950	950		1900
	Rocky and Non-trawlable	0 – 10 m
		10 –50 m		500	150	650
		Total
		0 – 50 m		500	150	650
	TOTAL (0 - 50 m)		26700	9100	2000	37800
OFFSHORE (50 - 200M)	Soft Hard and Sandy Rocky and non-trawlable		14000	5800	1560	21360
					140	140
			300	500		800
	TOTAL		14300	6300	1700	22300
	Total non-trawlable		300	1000	150	1450
	Total trawlable		40700	14400	3550	58650
	Total area of Continental shelf
	Total area of Continental shelf		41000	15400	3700	60100

Table 2 : Industrial fleet size and catches in Cameroon, 1951–1971
Year	Number of trawlers	Fresh fish landed (t)	Frozen fish (t)	Shrimp (t)	Total catch
1951	1	60			60
1952	3	120			120
1953	3	480			480
1954	6	1500			1500
1955	7	2500			2500
1956	9	2750			2750
1957	8	2553			2553
1958	8	2610			2610
1959	8	2860			2860
1960	9	3220			3220
1961	9	3819			3819
1962	15	5335			5335
1963	15	7436			7436
1964	16	8077			8077
1965	17	8515			8515
1966	20	11239			11239
1967	19	11558			11558
1968	22	11511	1179		12690
1969	33	12828	2538	257	15623
1970	36	16910	5312	943	23165
1971	39	14734	6695	1742	23171

Source : Laure (1969, 1972), who mentions an increase in size, engine power and fishing time in the period 1951–1968.

Table 3 : Size composition of Cameroonian industrial fleet,
TR = Trawlers
SHR = Shrimpers (Njock, in press)
	25–50 GRT		50–100 GRT		100–250 GRT		250–500 GRT		+500 GRT
	TR	SHR	TR	SHR	TR	SHR	TR	SHR	TR
1970	9		4	8	9		1	2	2
1971	9		6	10	10		1	3	1
1972	7		5	10	14		1	3	2
1973	6		8	10	13			3	2
1974	4		6	13	11			3	2
1975	2		6	13	9	4		1	2
1976	1		6	13	10	4		1	2
1977	1		6	13	10	4
1978			6	13	11	2		1
1979			6	13	12	4	1	1
1980			14	8	9	13		1
1981			17	6	11	10
1982			17	5	5	10
1983			12	5	3	11

Table 4 : Numbers of trawlers (TR) and shrimpers (SHR) per company, 1979–1984 (Njock, in press)
YEAR	1979		1980		1981		1982		1983		1984
COMPANY	TR	SHR	TR	SHR	TR	SHR	TR	SHR	TR	SHR	TR	SHR
CRECAM	-	13	-	18	-	10	-	10	-	10	-	10
PECAM/COPEMAR	9	-	9	-	8	6	5	5	3	6	1	9
COTONNEC	6	-	6	-	6	-	6	-	6	-	6	-
SOPAC	2	4	-	4
CAFISHTRACO	2	1
ATLANTIK FISH			2	2	1	-	1	-
NOPECAM			2		2	-	2	-
CHALUTCAM			4	-	6	-	6	-	6		6	-
SILVER FISH					3	-	2	-
SOCAPROMA					2	-
TOTAL	19	18	23	22	28	16	22	15	15	16	13	19
OVERALL TOTAL	37		45		44		37		31		32

Table 5 : Company COTONNEC. Distribution of the number of fishing trips by zone and depth (average 1977–1978), (Njock, in press)
	Fishing Depth (m)	Number of fishing Trips.	% of visits
Rio del Rey-Calabar	8 - 12	168	27,86
Bibundi	10 - 25	74	12,27
Sud Victoria	14 - 18	9	1,49
W Bouée A - Cap Cameroun	6 - 22	46	7,62
Bimbia	10 - 20	50	8,29
Sanaga	9 - 20	208	34,49
Nyong	12 - 20	34	5,63
Kribi	9 - 16	14	2,32

Table 6 : Estimated Nigerian continental shelf area on which the artisanal fishermen and industrial fleet operate (based on FI : DP/NIR/77/001 ; Field Document 2)
Coastal sector	Continental shelf area
Coastal sector	0 - 18 m	18 - 91 m	Total Area
Cross River State	2 810	3 590	6 400
Rivers State	5 200	10 890	16 090
Bendel State	1 200	470	2 670
Ondo/Ogun/Lagos States	2 570	5 730	8 300
TOTAL AREA	11 780	21 680	33 460

Table 7 : Estimated Nigerian continental shelf area which is frequented by shrimpers (based on FI : DP/NIR/77/001 : Field Document 2), but excluding the coastal sector of Lagos, Ogun and Ondo States
Coastal States	Continental shelf area
Coastal States	0 - 18 m	18 - 91 m	Total area
Cross River State	2 810	3 590	6 400
Rivers State	5 200	10 890	16 090
Bendel State	1 200	1 490	2 670
TOTAL	9 210	15 950	25 160

Table 8 : Evolution of the numbers of Nigerian artisanal inshore canoes. (Ssentongo, Ajayi and Ukpe, 1983)
Year	No. of non-motorized canoes	No. of motorized canoes	Total No. of canoes	% motorization
1971	90 923	4 202	95 125	4.42
1972	90 523	5 364	95 887	5.59
1973	91 732	6 224	97 956	6.35
1974	93 328	7 850	101 178	7.76
1975	91 951	8 240	100 191	8.22
1976	122 633	11 704	134 337	6.41
1977	125 256	12 187	137 443	8.87
1978	128 129	10 117	138 246	7.32
1979	121 218	12 187	133 405	9.14
1980	120 518	13 205	133 723	9.87
1981	101 430	18 712	120 142	15.57
1982	85 656	19 583	105 239	18.61
1983	109390	20 165	129 555	15.56
1984	89 237	20 401	109 638	18.61

Table 9 : Demersal fish species exploited by artisanal and industrial fisheries of Cameroon and Nigeria (modified after Ssentongo, Ajayi and Ukpe, 1983)
Commercial Name	FAO English Name	Species Name
Bar	Longneck croaker	Pseudotolithus typus -P. senegalensis
Bossu	Bobo croaker	Pseudotolithus elongatus
Gros brochet	Guinean barracuda	Sphyraena piscatorium
Gros capitaine	Giant African threadfin	Polydactylus quadrifilis
Petit capitaine	Small African threadfin	Galeoides decadactylus
Carpe	Snapper	Lutjanus spp.
Congre	Conger	(Conger, Paraconger, Ariosoma)
Disque	African moony	Psettias sebae
Dorade grise	Sompat grunt	Pomadasys jubelini
Dorade rose	‘Red’ seabream	Dentex spp. - Pagellus spp.
Friture	Bobo croaker	Pseudotolithus elongatus-P. typus
Friture	Royal threadfin	Pentanemus quinquarius-Pteroscion peli
Gros	Threadfin	Polydactylus quadrifilis
Gros	Cassava croaker	Pseudotolithus senegalensis
Gros	Snapper	Lutjanus spp.
Mâchoiron	Sea catfish	Arius spp.
Mérou	Grouper	Epinephelus spp.
Ombrine	Croaker	Pseudotolithus spp.
Raie	Stingray	Dasyatis spp. (Rajidae)
Rouget	West African goatfish	Pseudupeneus prayensis
Disque	African sicklefish	Drepane africana
Sole	Tonguesoles	Cynoglossus spp.
Crevette	Caramote shrimp	Penaeus kerathurus
Crevette	Pink shrimp	Penaeus notialis
Crevette	Guinea shrimp	Parapenaeopsis atlantica
Crabe	Smooth swimcrab	Portunus validus
Langouste	Royal spiny lobster	Panulirus regius1
Seiche	Cuttlefish	Sepia spp.

Table 10 : Fresh landings in Cameroonian trawlers (CH)₂ and shrimpers (CR)₁, in tons, 1970–1978, Njock (1978)
	COMMERCIAL CATEGORIES	1970	1971	1972	1973	1974	1975	1976	1977	1978
POISSONS	BAR		2 742	2 761	2 370	3 216	4 536	7 996	5 664	4 651
	BOSSU		515	652	1 002	675	742	1 014	1 020	2 040
	BROCHET		66	51	51	55	51	60	76	65
	CAPITAINE (GROS)		131	60	38	11	16	21	7	3
	CAPITAINE (PETIT)		318	463	588	681	871	908	1 030	761
	CARANGUE		44	96	107	141	233	356	477	309
	CARPE		5	5	2	1	2	3	13	1
	CONGRE		9	19	64	14	17	48	53	38
	DISQUE		380	223	266	261	252	265	334	287
	DORADE GRISE		92	104	203	127	155	213	233	244
	DORADE ROSE		76	48	4	111	5	2	2	-
	FRITURE		6 646	7 479	7 137	5 608	4 984	4 695	5 681	5 893
	MACHOIRON		1 670	1 100	1 058	960	1 059	1 064	1 087	1 448
	MEROU		27	12	15	21	29	33	35	37
	OMBRINE		52	84	68	69	49	101	73	106
	RAIE		895	493	862	153	444	351	345	404
	REQUIN		186	137	107	106	105	128	143	108
	ROUGET		12	3	3	-	5	-	-	-
	SARDINELLE		2	-	-	11	11	17	45	27
	SOLE		784	773	782	790	771	857	807	745
	DIVERS		481	453	462	119	219	418	559	687
	TOTAL	17 846	14 883	15 016	15 189	13 730	14 556	18 550	17 684	17 854
CRUSTACES	CRABE		17	28	25	27	20	19	35	27
	CREVETTE (CR)₁	942	1713	2 321	2 248	1 876	1 667	1 783	2 383	880
	CREVETTE (CH)₂		46	39	110	84	29	33	55	100
	LANGOUSTE		1	1	2	4	5	7	8	4
	TOTAL	942	1 777	2 389	2 385	1 991	1 721	1 842	2 481	1 011
CEPHALOPODES
CEPHALOPODES	SEICHE + CALMAR		9	13	42	15	3	5	2	2
TOTAL GENERAL		18 788	16 669	17 418	17 616	15 736	16 280	20 397	20 167	18 867

Table 11a : Demersal fisheries of Cameroon, landings in 1979 by company (Njock, in press)
FISH		ATLANTIC FISH	COTONNEC	COPEMAR	CAFISH	CRECAM	PECAM	NOPECAM	SOPAC	1979 TOTAL
	Bar	196 358	764 824	461 336	50 455	193 444	370 220	77 345	769 283	2 883 265
	Bossu	7 085	892 306	301 320	5 324	127 784	317 270	5 658	25 784	1 682 531
	Brochet	285	11 960	5 380	6 592	20 648	4 520	271	5 947	55 603
	Capitaine (pt)	24 025	183 237	69 140	33 151	141 374	61 880	7 845	106 544	627196
	Capitaine (gr.)	12 705	-	-	-	46 759	-	3 246	-	62 710
	Carange	285	-	29 000	9 533	43 703	19 782	541	11 676	114 520
	Carpe	-	-	-	-	-	-	135	778	913
	Congre	3 665	5 132	980	10 902	19 374	1 680	1 465	16 188	59 386
	Disque	4 779	67 714	22 240	9 880	46 367	15 940	1 758	12 406	181 084
	Dorade G.	8 348	68 130	43 320	1 775	18 852	24 180	3 359	39 650	207 614
	Dorade R.	-	-	-	2 282	-	-	-	-	2 282
	Friture	114 793	1 681 992	1 218 082	13 691	1 504 798	2 163 025	97 610	458 530	7 252 521
	Machoiron	9 325	457 985	309 162	9 381	135 378	420 500	3 381	50 353	1 395 465
	Gros (poiss.)	-	145 534	180 773	7 315	-	157 048	-	17 478	508 148
	Merou	366	-	-	11 917	-	-	-	1 703	13 986
	Nylon	-	-	527 990	-	761 118	482 600	-	-	1 771 708
	Ombrine	774	35 454	-	253	10 339	-	14	1 216	48 050
	Raie	2 240	102 362	128 080	-	-	130 130	5 410	32 353	400 575
	Requin	774	22 787	1 900	7 226	37 372	1 860	992	10 460	83 371
	Sardinelle	10 913	-	-	-	-	-	-	-	10 913
	Sole	9 569	236 068	102 480	12 297	258 593	260 040	14 855	56 678	950 580
	Then	-	-	-	-	-	-	-	-	-
	Turbot	-	-	-	253	2 017	-	399	-	2 669
	Belone	-	370 847	-	-	-	-	-	-	370 847
	Divers	1 059	61 589	119 073	5 071	46 208	95 608	1 105	19 132	348 845
	Rouget	-	-	-	-	15 040	-	-	-	15 040
	TOTAL	407 348	5 107 921	3 520 256	197 298	3 429 168	4 526 283	225 389	1 636 159	19 049 822
CRUSTACES	Crabe	-	17 083	8 878	-	-	6 324	-	-	32 285
	Crevettes	-	11 127	17 415	2 876	421 702	21 415	-	73 413	547 948
	Langoustes	-	1 484	673	-	-	404	6 403	-	8 964
	TOTAL	-	29 694	26 966	2 876	421 702	28 143	6 403	73 413	589 197
	Seiches & Calmar	-	94	887	-	-	1 212	-	-	-
TOTAL GENERAL		407 348	5 137 709	3 548 109	200 174	3 850 870	4 555 630	231 792	1 709 572	19 639 019

Table 11b : Demersal fisheries of Cameroon : landings in 1980 by company (Njock, in press)
FISH		ATLANTIC FISH	COTONNEC	COPEMAR	CRECAM	PECAM	NOPECAM	SOPAC	1980 TOTAL
	Bar	227 361	1 123 944	558 828	637 992	498 254	239 893	294 107	3 580 379
	Bossu	8 204	574 512	123 847	40 449	102 076	17 549	9 858	876 495
	Brochet	330	15 680	9 929	45 387	10 420	839	2 274	84 859
	Capitaine (pt)	27 819	163 845	110 526	108 818	91 101	24 332	40 733	567 174
	Capitaine (gr.)	14 712	-	-	219 314	-	10 068	-	244 094
	Carangue	330	-	28 260	35 480	26 340	1 678	4 464	96 552
	Carpe	-	-	-	-	-	420	298	718
	Congre	4 244	5 346	8 791	15 141	4 652	4 545	6 189	48 908
	Disque	5 187	89 654	31 285	55 609	17 000	5 454	4 743	208 932
	Dorade G.	9 666	48 880	42 079	34 061	39 342	10 418	15 159	199 605
	Dorade R.	-	-	-	-	-	-	-	-
	Friture	132 918	1 473 830	1 063 910	1 602 484	1 058 667	302 751	165 502	5 800 062
	Machoiron	10 798	388 060	199 698	191 589	181 174	10 488	19 251	1 001 058
	Gros (poiss.)	-	162 829	126 607	3 482	125 518	-	6 682	425 118
	Merou	424	-	1 380	1 100 081	42	-	651	1 102 578
	Nylon	-	-	576 110	4 870	528 385	-	-	1 109 365
	Ombrine	896	32 574	-	403	-	42	-	33 915
	Raie	2 593	75 415	240 762	43 441	110 156	16 780	12 369	501 516
	Requin	896	24 177	288	-	-	3 076	3 999	32 436
	Sardinelle	12 636	-	-	-	-	-	-	12 636
	Sole	11 080	123 772	84 086	221 772	88 864	46 077	21 669	597 320
	Then	-	-	-	-	-	-	-	-
	Turbot	-	-	-	11 397	-	1 238	465	13 100
	Belone	-	336 684	-	-	-	-	-	336 684
	Divers	1 226	74 777	26 540	4 792	19 302	3 426	7 314	137 377
	Rouget	-	-	-	-	-	-	-	-
	TOTAL	471 320	4 713 979	3 232 926	4 376 562	2 901 293	699 074	615 727	17 010 881
CRUSTACES	Crabe	-	13 072	12 335	-	8 297	-	-	33 704
	Crevettes	3 396	14 241	58 948	129 043	24 258	8 718	29 578	268 182
	Langoustes	-	573	2 719	-	922	-	-	4 214
	TOTAL	3 396	27 886	74 002	129 043	33 477	8 718	29 578	306 100
	Seiches & Calmar	-	1 576	2 859	-	2 613	-	-	7 048
TOTAL GENERAL		474 716	4 743 441	3 309 787	4 505 605	2 937 383	707 792	645 305	17 324 029

Table 11c : Demersal fisheries of Cameroon : landings in 1981 by company (Njock, in press)
FISH		ATLANTIC FISH	COTONNEC	COPEMAR	CRECAM	PECAM	NOPECAM	SOPAC FISH		1981TOTAL
	Bar	135 212	741 794	1 017 375	1 883 366	171 720	211 520	229 345	152 730	4 543 062
	Bossu	4 880	292 142	323 967	32 361	6 540	15 458	100	6 480	681 928
	Brochet	200	13 154	11 196	29 630	5 060	760	9 945	220	70 165
	Capitaine (pt)	16 560	154 030	128 699	275 220	45 460	21 440	89 480	11 856	742 745
	Capitaine (gr.)	8 766	69 197	53 414	230 767	-	8 902	-	5 612	376 658
	Carangue	200	20 280	19 916	61 154	8 140	1 480	22 680	780	134 630
	Carpe	-	253	253	40	-	400	-	-	946
	Congre	2 520	10 195	5 551	8 515	1 120	4 000	32 540	1 000	65 441
	Disque	3 080	56 747	59 672	146 503	10 320	4 800	21 580	2 960	305 662
	Dorade G.	5 760	58 100	43 318	89 295	13 060	9 200	12 400	4 460	235 593
	Dorade R.	-	-	-	80	-	-	-	-	80
	Friture	79 040	1 543 622	1 434 307	2 783 631	541 420	266 960	436 710	199 488	7 285 178
	Machoiron	6 440	433 394	418 524	243 594	53 450	9 268	57 229	16 960	1 238 859
	Gros (poiss.)	-	49 397	53 470	-	48 431	-	35 855	-	187 153
	Merou	264	803	-	10 361	-	-	240	40	11 708
	Nylon	-	208 512	-	736 171	284 180	-	288 056	-	1 516 919
	Ombrine	560	25 623	13 719	12	-	40	-	920	40 874
	Raie	1 556	102 979	78 280	44 404	45 160	14 800	73 380	6 160	366 719
	Requin	520	27 634	15 696	22 937	-	2 688	-	570	70 045
	Sardinelle	7 520	8 200	10 934	-	-	-	-	600	27 254
	Sole	6 600	177 166	149 216	357 800	24 200	40 600	43 025	31 414	830 021
	Turbot	-	3 056	2 511	-	-	1 092	-	650	7 309
	Belone	-	-	150 791	-	-	-	-	-	150 791
	Divers	720	211 228	53 209	-	34 898	3 046	36 318	5 580	344 999
	Rouget	-	-	-	-	-	-	-	-	-
	Déchets	-	-	-	158 563	-	-	-	-	158 563
	TOTAL	280 398	4 207 506	4 044 018	7 114 404	1 293 159	616 454	1 388 883	448 480	19 393 302
CRUSTACES	Crabe	1 036	8 394	10 146	-	2 979	72	9 221	140	31 988
	Crevettes	2 222	7 409	23 068	46 983	13 052	1 310	242 856	1 266	338 166
	Langoustes	-	1 956	576	-	855	-	470.5	-	3 857.5
	TOTAL	3 258	17 759	33 790	46 983	16 886	1 382	252 547.5	1 406	374 011.5
	Seiches & Calmar	-	7 671	1 616	-	1 664	-	4 457	-	15 408
TOTAL GENERAL		283 656	4 è 936	4 079 424	7 161 387	1 311 709	617 836	1 645 887.5	449 886	19 782 721.5

Table 11d : Demersal fisheries of Cameroon : landings in 1982 by company (Njock, in press)
FISH		ATLANTIC FISH	CHALUTCAM	COTONNEC	COPEMAR	CRECAM	NOPECAM	SILVER FISH	1982 TOTAL
	Bar	34 541	1 456 319	1 286 354	1 233 700	2 684 496	62 816	44 618	6 802 844
	Bossu	220	303 018	465 480	53 906	53 831	2 220	400	879 075
	Brochet	338	44 075	39 488	50 853	39 049	2 379	250	176 432
	Capitaine (pt)	8 310	185 957	121 491	209 873	554 492	13 260	5 208	1 098 591
	Capitaine (gr.)	5 043	106 990	92 296	30 453	45 594	-	189	280 565
	Carangue	360	23 571	19 196	20 474	64 001	60	-	127 662
	Carpe	-	2 225	1 654	244	8 697	-	10	12 830
	Congre	460	14 716	13 889	19 160	42 700	1 600	40	92 565
	Disque	2 060	78 183	38 630	42 601	118 716	1 500	2 870	284 560
	Dorade grise	2 320	41 120	36 700	214 870	117 015	900	-	412 925
	Dorade rose	-	120	10 850	80	38 624	-	-	49 674
	Friture	18 580	1 542 404	1 231 664	962 830	2 339 144	57 806	40 830	6 193 258
	Machoiron	3 200	413 310	335 575	350 830	203 450	2 910	2 521	1 311 796
	Merou	-	6 940	10 648	42 700	29 137	-	-	89 425
	Nylon	-	-	-	-	-	-	-	-
	Ombrine	20	48 112	9 156	4 780	-	140	20	62 228
	Raie	760	101 530	64 599	158 881	54 062	1 552	1 300	382 684
	Requin	160	27 925	13 925	14 703	21 890	1 460	220	80 283
	Rouget	-	-	-	-	-	-	-	-
	Sardinelle	20	21 415	11 743	8 970	14 293	1 280	60	57 781
	Sole	4 932	223 826	129 730	107 164	466 190	8 940	5 157	945 939
	Then	-	1 027	5 068	19 470	-	-	-	25 565
	Turbot	20	1 413	1 194	13 170	-	20	5	15 822
	Divers	380	104 585	31 821	36 016	35 762	451	2 267	211 282
	TOTAL	81 724	4 748 781	3 971 151	3 595 728	6 931 143	159 294	105 965	19 593 786
CRUSTACES	Crabe	-	13 676	17 038	3 416	28 066	-	144	52 340
	Crevette	648	3 507	9 078	466 853	83 779	426	226	564 517
	Langouste	-	541	216	113	-	-	-	870
	TOTAL	648	17 724	26 332	470 382	111 845	426	370	627 727
	Seiches & Calmar	-	650	372	14	-	-	45	1 081
TOTAL GENERAL		82 372	4 767 155	3 997 855	4 066 124	7 042 988	159 720	106 380	20 222 594

Table 11e : Demersal fisheries of Cameroon : landings in 1983 by company (Njock, in press)
FISH		CHALUTCAM	COTONNEC	COPEMAR	CRECAM	PECAM	1983 TOTAL
	Bar	1 176 395	1 172 016	266 110	1 787 507	115 600	4 517 628
	Bossu	189 783	380 310	100	-	-	570 193
	Brochet	14 810	39 564	14 000	13 008	900	82 282
	Capitaine (pt)	204 708	155 465	92 350	606 852	11 700	1 071 075
	Capitaine (gr.)	151 316	176 713	29 232	72 747	6 359	436 367
	Carangue	11 984	23 680	13 273	68 748	1 340	119 025
	Carpe	440	1 078	120	12	-	1 650
	Congre	6 759	15 032	9 171	4 153	320	35 435
	Disque	79 631	57 144	36 327	90 667	2 300	266 069
	Dorade G.	46 129	44 758	10 137	78 557	2 400	181 981
	Dorade R.	-	2 980	60	7 173	-	10 213
	Friture	1 392 387	1 136 578	129 519	1 674 238	88 895	4 421 617
	Machoiron	265 868	229 846	25 720	196 267	4 560	722 261
	Gros (poiss.)	-	-	-	-	-	-
	Merou	6 692	2 576	812	7 722	-	17 802
	Nylon	-	-	117 850	-	-	117 850
	Ombrine	40 416	18 963	140	279	-	59 798
	Raie	111 036	86 191	53 014	11 502	10 220	271 963
	Requin	29 165	29 309	2 973	5 103	231	66 781
	Sardinelle	10 317	11 921	80	8 400	-	30 718
	Sole	151 330	111 462	65 130	56 665	13 320	397 907
	Then	1 926	1 260	100	-	-	3 286
	Turbot	3 216	3 860	-	-	-	7 076
	Belone	-	-	-	-	-	-
	Divers	30 543	98 881	24 351	56 665	2 278	212 718
	Rouget	-	-	-	-	-	-
	TOTAL	3 924 851	3 799 587	890 569	4 746 265	260 423	13 621 695
CRUSTACES	Crabe	12 645	12 300	779	-	345	26 069
	Crevettes	1 024	2 194	377 011	198 847	2 054	581 130
	Langoustes	540	125	32	-	41	738
	TOTAL	14 209	14 619	377 822	198 847	2 440	607 937
	Seiches & Calmar	385	245	164	-	-	794
TOTAL GENERAL		3 939 445	3 814 451	1 268 555	4 945 112	262 863	14 230 426

Tableau 11f : Demersal fisheries of Cameroon : landings in 1984 by company (Njock, in press)
COMMERCIAL Names of Species	Name of the fishing Company
COMMERCIAL Names of Species	Name of the fishing Company	CHALUTCAM	COTONNEC	COPEMAR	CRECAM	PECAM	TOTAL 1984
FISH	Bar	1 038 146	844 846	141 660	1 288 488	19 680	3 332 820
	Bossu	146 437	339 396	-	-	-	485 833
	Brochet	19 210	18 892	4 668	11 442	1 240	55 452
	Petit Capitaine	229 990	103 717	81 840	481 870	8 280	905 697
	Gros Capitaine	200 928	169 549	568	49 612	524	421 181
	Carangue	17 288	16 129	14 000	42 656	2 680	92 753
	Carpe	1 207	1 516	-	-	400	3 123
	Congre	5 696	2 567	6 760	750	400	16 173
	Disque	124 224	39 096	15 840	32 735	1 040	212 935
	Dorade Gri	47 604	23 112	5 820	86 968	640	164 144
	Dorade Rose	29 905	-	-	10	-	29 915
	Friture	1 540 372	1 546 374	40 304	1 359 675	7 920	4 494 645
	Machoiron	171 530	245 465	11 640	111 123	3 000	542 758
	Gros poisson	-	-	-	-	-	-
	Merou	1 844	1 226	136	6 451	-	9 657
	Nylon	-	-	-	-	-	-
	Ombrine	11 081	7 003	80	-	-	18 164
	Raie	161 487	76 691	37 088	14 509	4 662	294 437
	Requin	30 891	14 434	680	4 663	-	50 668
	Sardinelle	8 023	25 621	28 080	3 257	-	64 981
	Sole	116 574	61 766	-	29 649	3 320	211 309
	Thon	396	-	-	290	-	686
	Turbot	7 172	1 414	-	-	6	8 592
	Belone	-	-	-	-	-	-
	Divers	43 802	92 217	14 534	1 770	1 980	154 303
	Rouget	-	-	-	-	-	-
	Tarpon	-	43	320	-	-	363
	TOTAL	3 953 807	3 631 074	404 018	3 525 918	55 772	11 570 589
CRUSTACES	Crabes	4 303	5 530	13 468	-	1 084	24 385
	Crevettes	561	897	567 370	214 059	76 030	858 917
	Langoustes	69	129	462	400	12	1 072
	TOTAL	4 933	6 556	581 300	214 459	77 126	884 374
Seiches et Calmar		592	-	-	-	1 038	1 630
TOTAL GENERAL		3 959 332	3 637 630	985 318	3 740 377	133 936	12 456 593

Table 12 : Standardized fishing effort (fishing days of a 400 HP vessel) of vessels based at Douala, 1970–1983 (Njock, in press)
	1970	1971	1972	1973	1974	1975	1976	1977	1978	1979	1980	1981	1982	1983
Shrimpers	1927	2900	3303	3349	3605	3015	3505	3745	3286	3063	690	698	707	632
Trawlers	3701	3587	3788	4104	3179	2873	2040	2397	3279	4149	5063	4680	3975	4397
Trawlers-Shrimpers											1628	2708	2988	2805
TOTAL	5628	6487	7091	7453	6784	5888	5545	6142	6565	7212	7381	8086	7670	7834

Table 13 : Numbers of fishing days per company by year and vessel type (Njock, in press) in Cameroon TR : Trawler ; SHR : Shrimper ; TR-SHR : Trawler-Shrimper
		ATLANTIC	SOPAC.	CHALUTCAM	COTONNEC	CO/PECAM	CAFISH	CRECAM	NOPECAM	SOCAPROMA	SILVER	TOTAL
1979	TR		954		1 584	2 080	270	-				4 888
1979	SHR							2 752				2 752
1980	TR	304		480	1 582	1 981			502			4 849
	SHR		288									288
	TR-SHR							2 428				2 428
1981	TR	218		1 512	1 563	790			456	89	354	4 982
	SHR					893						893
	TR-SHR							2 990				2 990
1982	TR	97		1 669	1 548	625			138		87	4 164
	SHR					1 289						1 289
	TR-SHR							2 999				2 999
1983	TR			1 530	1 526	561						3 617
	SHR					1 266						1 266
	TR-SHR							2 810				2 810
1984	TR			1 520	1 499	22						3 041
	SHR					1 782						1 782
	TR-SHR							2 325				2 325

Table 14 : Catches (metric tons) per day at sea for the total Cameroonian fleet, COTONNEC (finfish trawlers) and CRECAM (shrimp-trawlers) (Njock, in press)
YEAR	TOTAL	COTONNEC	CRECAM
1970	3.338	-	364
1971	2.573	2.162	530
1972	2.456	2.445	557
1973	2.364	2.919	478
1974	2.320	3.219	407
1975	2.765	3.941	373
1976	3.678	4.505	310
1977	3.283	4.632	271
1978	2.874	4.135	244
1979	2.723	3.942	168
1980	2.347	4.220	59
1981	2.466	3.058	17
1982	2.637	3.005	32
1983	1.816	2.920	76
1984	1.743	-	-

Table 15 : Estimated total Nigerian catch of demersal fish by artisanal and industrial fisheries, considering that the demersal account for 72% (1977–1982). Demersal catch from brackish and marine waters (based on catch records, Federal Department of Fisheries, Lagos and CECAF Statistical Bulletin No.4)
Production sectors	1971	1972	1973	1974	1975	1976	1977	1978	1979	1980	1981	1982	1983	1984
Artisanal fishery
Coastal and brackish-water	143 700	157 500	164 500	162 700	165 500	176 600	178 400	183 900	190 400	197 400	233 200	232 900	259 000	159 400
Industrial fishery
Coastal (fish)	3 000	2 900	4 000	5 700	8 000	8 200	13 700	15 200	9 400	16 300	12 400	15 100	13 600	22 300
Coastal (shrimp)	1 300	1 200	1 400	2 000	2 100	1 700	2 200	1 900	1 900	1 800	2 000	3 500	2 400	2 300
Total (all sectors)	148 000	161 600	169 900	170 400	175 600	186 500	194 300	201 000	201 700	215 500	247 600	251 500	275000	184 000
Percentage contribution by the artisanal fishery(%)	97	97	97	95	94	95	92	91	94	92	94	93	94	87
Percentage contribution by the industrial fisheries (%)	3	3	3	5	6	5	8	9	6	8	6	7	6	13

Table 16 : Species composition of Nigerian demersal catches (artisanal and industrial fleets, based on records of FDF, Lagos and the CECAF Statistical Bulletin No. 4)
Fish Species Groups	1977	1978	1979	1980	1981	1982
Cynoglossidae	11 852	12 274	13 749	5 667	7 117	7 343
Ariidae	20 853	21 440	20 059	12 028	13 669	14 103
Congerspp.	395	402	399	1 267	1 728	1 783
Pseudotolithus spp.	35 292	36 158	34 820	48 932	51 189	52 815
Brachydeuterus	10 947	11 154	11 477	6 723	10 275	10 601
Lutjanus	19 434	19 815	20 419	8 383	9 963	10 279
Polynemidae	41 673	42 472	43 650	23 667	24 512	25 291
Demersal percomonpas	879	893	928	139	581	599
Sharks, Rays,etc	19 915	20 312	20 905	30 191	28 575	29 483
Shrimps & Prawns	2 117	1 916	1 901	1 890	2 003	3 525
Marine Fishes n.e.i. ^a	38 864	42 828	40 740	62 656	66 480	68 592
TOTAL	202 221	209 664	209 047	201 543	216 092	224 414

^a The marine fishes n.e.i include the Sparidae, Drepane, Serranidae and other demersal species not listed above.

Table 17 : Species composition, effort (days at sea) and CPUE (kg/day) for the inshore trawlers based at Lagos (based on record of Federal Department of Fisheries, Lagos) - catch of inshore trawlers (in kg)
	1974	1975	1976	1977	1978	1979	1980	1981	1982	1983	1984
PSEUDOTOLITHUS(L)	125425	159150	146789	168806	139642	190769	134236	1054683	1063862	2069463	1449160
PSEUDOTOLITHUS(S)	1225326	1663769	2202425	3750016	3579062	3846724	2494559	2596642	3191451	3160415	8633171
RAJIDAE	65952	71507	68342	95919	78688	108487	192251	94655	115883	114462	112899
CYNOGLOSSIDAE	120169	117009	135143	226685	188549	167676	2456722	318378	522300	764953	1598172
SHARKS	67583	76064	72230	73760	76275	137818	109828	94113	114125	210904	146107
POLYNEMIDAE	81556	70896	123065	234244	217663	175256	20340	108172	22008	16280	68395
ARIIDAE	135785	146589	144265	159410	179522	186894	95073	78990	101410	142686	510977
BRACHYDEUTERUS	225199	242798	224070	237697	238895	18723		100228	769	300	240
DREPANIDAE	2145	49498	105470	209693	174478	175390		426	159	200
POMADASYIDAE	61644	63536	57880	60889	61279	68022	63843	160705	80016	55097	51106
MOONFISH	103251	173511	218584	60889	215305	152163	20		150	396	93118
MISCELLANEOUS	975894		129567	2135654	2212679	800660	68385	2265	754297	2654333	7040121
TOTAL FISH	3189928	2834328	3627831	7413661	7362036	6028580	5635257	4609257	5966429	9189488	19703465
TOTAL SHRIMP	75611	82944	83016	108368	111786	104955	99369	996	123506	37104	963320
GRAND TOTAL	3265538	2917271	3710847	7522029	7473822	6133535	5734626	4610253	6089935	9226592	20666785
EFFORT (DAYS AT SEA)	7634	8143	71032	84564	99281	54315
CPUE (KG/DAY AT SEA)	428	358	52	89	75	113

Table 18 : Estimated numbers of canoes and inshore trawlers/shrimpers operating in the marine and brackish waters of Nigeria (based on records of the Federal Department of Fisheries, Lagos).
	Artisanal Canoes		Inshore trawlers
	Non-powered	Powered	Fishing	Shrimping
1971	90 923	4 204	13	26
1972	90 523	5 364	26	29
1973	91 732	6 224	27	30
1974	93 328	7 850	33	39
1975	91 951	8 240	33	30
1976	122 633	11 704	30	29
1977	125 256	12 187	43	36
1978	128 129	10 117	38	49
1979	121 218	12 187	44	48
1980	120 518	13 205	35	45
1981	101 430	18 712	45	36
1982	85 656	19 583	52	34
1983	109 390	20 165	81	39
1984	89 237	20 401	94	37

Table 19 : Estimated total annual catch (metric tons) of the Nigerian Industrial Fisheries (based on records of Federal Department of Fisheries, Lagos)
TYPE OF FISHERIES		TIME IN YEARS
TYPE OF FISHERIES		1973	1974	1975	1976	1977	1978	1979	1980	1981	1982	1983	1984
Inshore Trawlers	- finfish catch	4000	5700	8000	8200	13700	15800	9400	16300	12400	15000	13600	22300
	- Vessels	27	33	33	30	43	38	44	35	45	52	81	94
	- CPUE (t/vessel)	148	173	242	273	319	400	214	466	276	288	168	237
Inshore shrimpers	- Shrimp catch	1400	2000	2100	1700	2200	1900	1900	1800	2000	3500	2400	2300
	- Vessels	30	39	30	29	36	49	48	45	36	34	39	37
	- CPUE (t/vessel)	47	51	70	59	61	39	40	40	56	102	62	62

Table 20 : Combined catch and effort data for two of the Nigerian fishing/shrimping companies for the period 1982–84 (based on records on CECAF files)
Year	Month	Catch (t)		No.of boats	No.of boat/days	CPUE (kg/boat/day)
Year	Month	Shrimp	Finish	No.of boats	No.of boat/days	Shrimp	Finfish
1982	January	64.83	139.83	14	303	213.96	461.49
	February	48.27	154.57	12	267	180.79	579.91
	March	7.71	140.57	7	129	59.77	1 089.69
	April	4.90	157.99	7	132	37.12	1 196.89
	May	75.42	143.68	14	312	241.73	460.51
	June	74.66	49.89	7	219	340.91	227.91
	July	4.75	102.76	8	72	65.97	1 427.22
	August	276.34	249.19	29	879	314.38	283.49
	September	69.07	276.85	26	371	186.17	746.23
	October	144.67	314.70	33	584	247.72	538.87
	November	2.89	45.13	4	47	61.49	960.21
	December	12.12	212.18	19	170	71.29	1 248.12
	Total	785.63	1 987.34	180	3 485	225.43	570.26
1983	January	59.28	170.79	18	314	188.79	543.92
	February	53.08	212.71	20	308	172.34	690.62
	March	115.94	176.92	19	545	212.73	324.62
	April	82.53	183.04	18	429	192.38	426.67
	May	60.76	159.16	15	349	174.10	456.05
	June	62.34	140.96	13	333	197.21	423.30
	July	8.40	158.87	9	178	47.19	892.53
	August	12.85	141.47	8	154	83.44	918.64
	September	95.16	144.66	14	414	229.86	349.42
	October	43.94	174.44	10	237	185.40	736.03
	November	77.76	189.97	10	395	196.86	480.94
	December	53.29	185.59	14	338	157.66	549.08
	Total	725.33	2 039.58	169	3 994	181.60	510.66
1984	January	24.43	154.25	10	245	116.04	629.59
	February	44.53	160.05	14	333	133.72	490.63
	March	74.62	147.05	15	420	177.67	350.12
	April	7.11	141.25	10	171	41.58	826.02
	May	7.09	129.89	9	179	41.22	755.17
	June	113.43	188.80	16	448	253.19	421.43
	July	29.50	160.50	12	255	115.69	629.41
	August	96.64	207.22	16	409	236.28	506.65
	September	79.48	214.10	17	444	179.01	482.21
	October	48.37	228.61	17	409	118.26	558.95
	November	23.40	24.00	3	106	220.75	226.42
	December	25.20	0	3	108	233.33	0
	Total	577.80	1 755.72	142	3 520	164.15	498.78

Table 21: Estimated population parameters for some demersal fish species occuring on the continental shelf of Cameroon and Nigeria
Fish species	Maximum length (cm) (L∞)	Growth rate (K)	Length at first maturity (cm) (1_m)	Length at first capture (cm) (1_c)	References
Arius heudeloti	73	0.12	35	25	NIOMR, Pers. comm
Galeoides decadactylus	55	0.41	21	10	Longhurst (1965)
Pentanemus quadrifilis	46	0.44	19	13	Ajayi (in press)
Pseudotolithus elongatus	56	0.30	15	18	Bayagbona (1968)
P. senegalensis	80	0.34	17	18	Bayagbona (1968)
Pseudolotithus (P.)typus	103	0.29	18	19	Bayagbona (1965)
Pseudotolithus typus	61	0.37	-	-	Longhurst (1964 and 1969)
Pseudotolithus elongatus	45	0.61	-	-	Longhurst(1964 and 1969)
Pseudotolithus elongatus	60	0.29	-	-	Njock and Djama (Annex 7)

Table 22 : Environmental data Ambas Bay (monthly means), July 1984-March 1985. (Ikome 1985)
MONTH	SALINITY %	CONDUCTIVITY μhoms	TEMP. SURF. °C	D.O, where avail.	pH
JULY	25.5	360	25.5	4.4	7.6
AUGUST	23.2	290	27.I	5.7	8.I
SEPT.	22.I	300	27.6	5.9	7.93
OCT.	20	299	28.3	8.25	7,79
NOV.	20.3	290	30.4	5.0	---
DEC.	22	3I2	30.7	---	---
JAN.	23.5	335	28.2	5.9	---
FEB.	28	345	28.4	6.0	----
MAR.	27	360	29.9	5.5	---

Table 23 : Global demersal fish and shrimp production (tons), standardized effort (days fishing) and CPUE data for Cameroon
Year	Production (t)	Effort (days)	CPUE (t/d)
1970	18,788	5 628	3.338
1971	16,669	6 478	2.573
1972	17,418	7 091	2.456
1973	17,616	7 453	2.364
1974	15,736	6 784	2.320
1975	16,280	5 888	2.765
1976	20,397	5 545	3.678
1977	20,167	6 142	3.283
1978	18,867	6 565	2.874
1979	19,639	7 212	2.723
1980	17,324	7 381	2.347
1981	19,783	8 086	2.447
1982	20,223	7 670	2.637
1983	14,230	7 834	1.816
1984	12,457	7 148	1.743

Table 24: Shrimp (P. notialis) production (“head on”) in Cameroon and Nigeria (metric tons),standardized CPUE-data (kg/day) for CRECAM (Cameroonian shrimping company) and theoretical total effort (days at sea)
Year	Cameroon (t) (1)	Nigeria(t) (2)	Total (t)	CPUE CRECAM (Kg/day)	Theoretical Effort (days at sea)	Nigerian (3) effort (days at sea)
1969		585	585			2 355
1970	942	912	1 854	364	5 093	3 627
1971	1 759	1 345	3 104	530	5 857	6 124
1972	2 360	1 254	3 614	557	6 488	6 368
1973	2 358	1 359	3 717	478	7 776	6 504
1974	1 960	2 022	3 982	407	9 784	7 938
1975	1 696	2 034	3 730	379	10 000	5 572
1976	1 816	1 680	3 496	310	11 277	5 314
1977	2 438	2 116	4 554	271	16 804	7 035
1978	980	1 798	2 778	244	11385	7 241
1979	548	1 900	2 448	168	13 381	5 139
1980	268	1 800	2 068	59	-	5 655
1981	338	2 000	2 338	17	-	-
1982	565	3 500	4 065	32	-	-
1983	581	2 400	2 981	76	-	-
1984	859	2 300	3 159	-	-	-

(1) Source: Njock, 1979; 1985 (in press)

(2) Source: 1969–1978: Adetayo, 1982 1979–1984: Federal Department of Fisheries

(3) Source: Adetayo, 1982 (unstandardized effort)

Table 25 : Evolution of catches of CRECAM (Crevettes du Cameroun) and the relationship shrimp/total catch (%) (Njock, in press)
Year	Shrimp	Fish	TOTAL	Shrimp/Total (%)
1970	823	-	823	-
1971	1 205	-	1 205	-
1972	1 494	-	1 494	-
1973	1 406	598	2 004	70.2
1974	1 626	1 310	2 936	55.4
1975	1 451	2 188	3 639	39.9
1976	1 264	2 523	3 787	33.4
1977	1 263	3 892	5 155	24.5
1978	880	4 247	5 127	17.2
1979	422	3 429	3 851	11.0
1980	129	4 365	4 494	2.9
1981	47	6 911	6 958	0.7
1982	84	6 931	7 015	1.2
1983	199	4 746	4 945	4.0
1984	214	3 526	3 740	5.7

Table 26: Summary of hydroacoustic data for demersal fish - Nigeria area: FIOLENT Cruise 2 (November) Integrator value for EK-38 echosounder (Robertson, 1977)
Area (n.mi²)		Number of samples n	Mean value of echo integrator reading per n.mi N_i(mm/n.mi)	Standard deviation s	Predicted catch P_i=0.03×3.5N_i + 0.01 (tons/h)	Average fish density (tons/n.mi²)	Commercial fish stock (tons)
S₁	300	48	0.35	0.27	0.05	1.09	326
S₂	200	20	3.10	0.91	0.34	7.91	1 582
S₃	5 100	469	0.99	0.38	0.11	2.65	13 517
S₄	1 700	164	2.49	0.9	0.27	6.31	10 733
S₅	325	39	2.96	1.08	0.32	7.44	2 419
7 625		Total					28 600

Table 27: Trawling surveys carried out in Nigerian waters (Van der Knaap, 1985)
TRAWLING SURVEYS
IN NIGERIAN WATERS
VESSEL	AREA	LATITUDE	PERIOD	NAME SURVEY	REFERENCE
CALYPSO	SENGBGUISLSTPICNIGCAMGAB		MAY-JUL 56		Forest, 1959
CAPE ST. MARY	NIG TO BEN		JUL-AUG 52	NM/1-1952	Longhurst, 1965
FIOLENT	GHATO NIGCAMGABCONZAI		JUL-DEC 76	FIOLENT	Robertson, 1977
FRIDTJOF NANSEN	TO.BEN.NIG.CAM.GAB.CONSTP	05 20S–06 20N	AUG-SEP 81	NANSEN	Stromme e.a., 1983
KIARA	NIG		MAY-JUN 62	K 1962/1	Longhurst, 1965
KIARA	NIG		MAR 63	K 1963/1	Longhurst, 1965
KIARA	NIG		APR 63	K 1963/2	Longhurst, 1965
KIARA	NIG		MAY 63	K 1963/4	Longhurst, 1965
KIARA	NIG		JUN 63	K 1963/5	Longhurst, 1965
KIARA	NIG		JUN 63	K 1963/6	Longhurst, 1965
KIARA	NIG		FEB+MAY 65		Raitt e.a., 1969
KIARA	NIG		AUG 65		Raitt e.a., 1969
KIARA	NIG		NOV 65		Raitt e.a., 1969
KIARA	NIG		JUN 66		Raitt e.a., 1969
KIARA	NIG		JUL 63	K 1963/7	Longhurst, 1965
KIARA	NIG		OCT 63	K 1963/8	Longhurst, 1965
KIARA	NIG		APR 63	K 1963/3	Longhurst, 1965
THIERRY	GHATOBENIGCAMEQGGABCONZAI	06 00S–04 00N	FEB-JUN 64	GUINEAN II	Williams, 1968; 1969
THIERRY	GHATOBENIGCAMEQGGABCONZAI	06 00S–04 00N	SEP-DEC 63	GUINEAN I	Williams, 1968; 1969

Table 28: Trawling surveys carried out in Cameroonian waters (Van der Knaap, 1985)
TRAWLING SURVEYS
IN CAMEROONIAN WATERS
VESSEL	AREA	LATITUDE	PERIOD	NAME SURVEY	REFERENCES
CALYPSO	SENGBGUISLSTPICNIGCAMGAB		MAY-JUL 56		Forest, 1959
FIOLENT	CAM.GAB.CON.ZAI.ANG		JAN-MAY 76	FIOLENT	Robertson, 1977
FIOLENT	GHATO NIGCAMGABCONZAI		JUL-DEC 76	FIOLENT	Robertson, 1977
FRIDTJOF NANSEN	TO.BEN.NIG.CAM.GAB.CONSTP	05 20S–06 20N	AUG-SEP 81	NANSEN	Stronne e.a., 1983
OMBANGO	CAM	02 21N–04 16N	1962–1963	CAMEROUN	Crosnier, 1964
OMBANGO	CAM	02 21N–04 16N	AUG 63	CAMEROUN	Crosnier, 1964
THIERRY	GHATOBENIGCAMEQGGABCONZAI	06 00S–04 00N	FEB-JUN 64	GUINEAN II	Williams, 1968; 1969
THIERRY	GHATOBENIGCAMEQGGABCONZAI	06 00S–04 00N	SEP-DEC 63	GUINEAN II	Williams, 1968; 1969

Table 29: Yields (kg/h) of several species and species groups in Cameroonian waters during the FIOLENT survey 1976 (Roberstson, 1977)
	Cruise 1 (May)			Cruise 2 (September)
Depth (m) Species	100–50		50–20	100–50		50–20
Sparidae	-		-	35		1.7
Brachydeuterus auritus	16.3		15	7		12
Carangidae		1.7			14.1
Trichiurus lepturus	-		-	3		5
Sciaenidae		12.8			45
Triglidae		4.4			27
Brotulidae		1.2			8.3

Table 30: Summary of hydroacoustic data for demersal fish - Cameroon area: FIOLENT Cruise 1 (Robertson, 1977)
Area (n.mi²)	Number of samples n	Mean value of echo integrator reading per n.mi N_i(mm/n.mi)	Standard deviation s	Predicted catch P_i=0.0113×3.5N_i+0.0146 (tons/h)	Average fish density (tons/n.mi²)	Commercial fish stock (tons)
A₁ 1 018	196	0.17	0.16	0.021	0.75	763.5
A₂₂ 104	24	1.97	1.11	0.092	3.25	338
A₂₃ 144	40	1.67	0.85	0.080	2.83	407.8
1 266	Total					1 700

Table 31: Summary of hydroacoustic data for demersal fish - FIOLENT Cruise 2 (September) (Robertson, 1977)
Area (n.mi²)		Number of samples n	Mean value of echo integrator reading per n.mi N_i(mm/n.mi)		Standard deviation s	Predicted catch P_i=0.0113 × 3.5N_i+0.0146 (tons/h)	Average fish density (tons/n.mi₂)	Commercial fish stock (tons)
S₁	74	43	(4.6)^x	1.31	(1.62)^x	0.006	2.33	172.42
S₂	516	106		0.55	0.40	0.036	1.28	660.48
S₃	700	136		1.51	0.53	0.074	2.61	1 827
S₄	12	9		4.4	2.50	0.188	6.62	79.44
S₅	22	9		3.11	0.78	0.137	4.83	106.26
S₆	56	36		4.06	2.37	0.174	6.15	344.4
1 380		Total						3 600.0