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Tables

Table 1

Volume of Lake Tegel 5 to 16 m under surface Northeastern area limited by the islands Scharfenberg and Reiswerder.

Depth (m)
Area (106m2)  Volume (106m3)
  5
1,8621,866
  6
1,7691,674
  7
1.6121.531
  8
1.4501.313
  9
1.1751.087
10
1.0    0.916
11
0.8310.763
12
0.6940.597
13
0.5    0.381
14
0.2620.168
15
0.0750.047
16
0.0190.010
  ∑10.353          

Table 2

Percentage composition of commercial fishes from Lake Tegel in 1982 to 1985 and yield of Lake Tegel plus upper Havel, total area of 700 ha.

Fish species
% of valuable fishStocking
198219831984198519841985
Eel
(Anguilla anguilla)
27312834890 kg = 44 500 ind. 890 kg = 44 500 ind.
Roach
(Rutilus rutilus)
37344128  
Pikeperch
(Stizostedion lucioperca)
13162023  
Bream (Abramis brama) and
White bream
(Blicca björkna)
1612 5 7  
Pike
(Esox lucius)
 3 3 2 23 350 ind.2 520 ind.
Perch
(Perca fluviatilis)
 1 1 1 3  
Tench
(Tinca tinca)
 1 1 1 1100 kg300 kg
Carp
(Cyprinus carpio)
 1 1 - -  
European catfish
(Silurus glanis)
 1 1 1 1400 kg350 kg
Valuable fish (kg)
17 39218 95619 86318 102  
Coarse fish (kg)
69 38048 72571 36054 020  
Total yield (kg)
86 77267 68191 22372 122  

Table 3

Trawl catches during the EIFAC Intercalibration Exercise on Lake Tegel

Trawl haul No.Towing coursedepthStizostedion luciopercaAspius aspiusHypophthalmichthys molitrixAlburnus alburnusAbramis bramaAcerina cernuaBlicca bjorknaAnguilla anguillaType of trawlOsmerus eperlanusPerca fluviatilisRutilus rutilus
1Greenwich 0---- 25- 11-PMT---
2Hasselwerder-Sees. 02--- 19-247 -PMT--3
3Hasselwerder 0---- 52 12 33-YFT---
4Greenwich 0---1   9 15--YFT1-2
5Greenwich 0----   8   2   3-CVT-1-
6Hasselwerder-Sees. 0---- 12   2 17-CVT111
7Greenwich 51--1110  23 66-CVT-21
8Hasselwerder 51---231  31671 -CVT-34
9Hasselwerder 5---1 71 21 59-YFT---
10Greenwich 51--- 59210  19-YFT11-
11Greenwich 5---- 46   1 27-PMT-12
12Hasselwerder 5---- 29-143 -PMT---
13Hasselwerder10 ---- 17- 16-PMT---
14Greenwich10 ---- 31- 36-PMT---
15Greenwich10 ---- 15   8   1-YFT---
16Hasselwerder10 3---   9   5-1YFT-1-
17Hasselwerder10 ----   9-   4-CVT---
18Greenwich10 1--- 25 66 113CVT-1-
19Reiswerder 54-1-480 -3792   1CVT-1-
20" 5---- 36107  61-YFT13-
21" 51--- 42-426 -PMT--3
22" 0-1-- 33-450 -PMT--12  
23" 0---2 18   4 32-YFT1--
24" 0--11 19   4100 -CVT--3
25"10 3-1-216    1 81-CVT--1
26"10 1--- 23   7 13-YFT11-
27"10 ---- 51-105 -PMT-11
   18 1361695   519 6424   5 61735  

Total: 8729 fishes

Table 4

Arrangement of the 8 different mesh sizes (mm) in the gill net from the type “Latin Square”.

1756441327211034
2713102134564417
1034561713442721
4421273417101356

Table 5

Mark-recapture data for all catches cumulated.
m = numbers of marked fish; c = fish checked for marks; r = recaptured fish; N = population estimate for all length groups of marked fish; s = standard deviation of N; Ncm = population estimates for single cm-groups; B = biomass

    BreamWhite BreamRoachsum/mean
m *
 3 12614 498 10 583   28 207
c
 8 76526 502   58135 848
r
   132   947    78 1 157
r/m
  0.0480.073 0.009  0.048
N *
181 956   361 768     61 343   605 067    
s
15 590  **6 360  
Ncm
159 888    362 253     66 581   588 722    
B (kg)
41 571  43 479   10 115   95 165   
B (kg/ha)
   139  145    34 317

* 8 % mortality calculated
** a single standard deviation is not available because the estimate is calculated from 3 independent estimates

Table 6

Numbers of caught fish

Young Fish Trawl
Key of haulsA. cernuaB. björknaA. bramaothers
} T1 – T27388  218  29324
P. Midwater Trawl
    11460  29339
C. Vendace Trawl
1294745111039
Seine
     S121450771477401  
Gill-net
    G1 – G3126  348    8070
Total
 85811848  3253573  

Table 7

Modal length (cm) of the fishes from different nets

 A. cernuaB. björknaA. bramaTotal fish
   Young Fish Trawl51721  5 ; 17
   PM-Trawl-17?      17
   C. Vendace Trawl91720.58 ; 18
   Seine 1   8.51722.5     17
   Gill net616?     6 ; 16.5

Table 8

Mean sizes of 3 fish species from hauls differing in respect to gear, trawling depth and region of Lake Tegel

 Duration of trawling (min.)A. brama
11 – 31 cm		A. cernua
4 – 10 cm		B. björkna
12 – 21 cm
Young Fish Trawl13520.2 ± 4.26.1 ± 1.5(17.1 ± 1.8)
PM -Trawl15820.8 ± 5.0 16.8 ± 1.8
C. Vendace Trawl157(21.1 ± 3.1)(8.1 ± 1.2)(17.2 ± 2.6)
Surface18821.4 ± 5.16.4 ± 1.6(16.6 ± 1.9)
5 m160(20.4 ± 4.2)5.9 ± 1.517.0 ± 1.8
10 m102(20.8 ± 3.3)7.3 ± 1.817.9 ± 1.6
Trawl-transect 115721.2 ± 5.56.6 ± 1.717.3 ± 1.7
Trawl-transect 213019.8 ± 4.0(7.0 ± 3.7)17.0 ± 1.7
Trawl-transect 316320.0 ± 5.8(5.9 ± 1.3)(16.6 ± 2.9)

(   ) = size distribution deviates from normality

Table 9

Regional fish density from the single-beam system. Compare Figure 7

TransectFish/haDate (Nov.)
1136113
2 3682x13
3214813
I-J  92513
G-H277513
H-J  58213
D-C  36214
F-E176914
H-G237414
J-I296914
L-K  60614

x hit a school

Table 10

Population estimates of fish in Lake Tegel from dual-beam system. Density estimates scaled by depth (vertical stratification). TS ≥ -58 dB

Date
Day/NightFrequency
kHz		Population Size
n × 103		95% Confidence Limits
n × 103
11/12
D420483226
11/12
N420213  93
11/13
N420385198
11/12–13
N420310115
11/14
N120624312

Table 11

Selected estimates of overall-fish population in Lake Tegel in November 1985

MethodFish size
≥ cm		Mortality
%		Fish Population
n × 10 3		Confidence Limits   excluding
n × 103level
%
dual-beam   2 310195 – 425  5   surface layer,
single-beam   4 393226 – 682  5   inshore, bottom
mark - recapture13;11;168   605521 – 68920   others than bream,
  2   645554 – 73620   white bream, roach


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