| Lindem Data Acquisition | Filename : PRERUNTS |
| University of Jyvaskyla |
ECHOANALYSIS: Experiment TS/Length
DATE : 17/04/89 DATA FROM TRANSECT : prerunts measurements
ECHOSOUNDER : EY-M
REMARKS : tape a320 b70
NUMBER OF PINGS ANALYZED : 1027. START AT PING NO. 0
IN 1 DEPTHLAYERS FROM 2 TO 50 METERS.
CALCULATED MEAN FISH DENSITY ALONG TRANSECT: 802 FISH/HECTARE.
| DEPTH METERS | REGISTRATION SINGLE FISH | INTEGRAL SINGLE FISH | INTEGRAL SCHOOLS | TOTAL FISHDENSITY |
| 2–50 | 646 F/HA | 5.2867E+06 | 1.2787E+06 | 802 FISH/HA |
FISH DENSITY SPLIT INTO 3 SIZEGROUPS.
(CALCULATED WITH DATA FROM SINGLEFISH-ECHOES.)
| TS 44–50 DB: | SINGLE FISH | RES. | TOTAL. | |
| DEPTH: | 2 – 50 METERS | 287 FISH/HA | 80.5 % | 356 FISH/HA |
| TOTAL: | 356 FISH/HA | |||
| TS 51–59 DB: | SINGLE FISH | RES. | TOTAL. | |
| DEPTH: | 2 – 50 METERS | 359 FISH/HA | 80.5 % | 446 FISH/HA |
| TOTAL: | 446 FISH/HA | |||
| TS 60–62 DB: | SINGLE FISH | RES. | TOTAL. | |
| DEPTH: | 2 – 50 METERS | 0 FISH/HA | 0.0 % | 0 FISH/HA |
| TOTAL: | 0 FISH/HA | |||
ALL SINGLE FISH ECHOES GREATER THAN TS=-38 DB ARE TRUNCATED
AND SHIFTED DOWN INTO THE -38 DB SIZEGROUP.
IF FISH DENSITY IN A DEPTHLAYER IS FOLLOWED BY A :
“?” : THE NUMBER OF SINGLE FISH ECHOES IS TOO LOW AND THE CALCULATED
DENSITY HAS POOR ACCURACY!
“**”: TOO MANY MULTIPLE ECHOES, ROUNDING ERRORS MAY OCCUR DUE TO
INTEGER PRESENTATION OF REAL VARIABLES.…!!
ECHOSIGNALS FROM TRANSECT : prerunts measurements
DEPTH LAYER : 2 – 50 METERS. CALCULATED MEAN DEPTH: 50 METERS.
NUMBER OF PINGS ANALYSED : 1027 OUT OF 1027. START NO.: 0
BOTTOM HAS BLOCKED UP 0 PINGS IN THIS DEPTHLAYER.
SINGLEFISH RESOLUTION IN DEPTHLAYER : 80.5 %.
INTEGRATED VALUE FROM SCHOOLS : 1.2787E+06
| TS(DB): | ECHO-NUMBER: | VOLUME DENSITY, FISH/1000 M**3: | AREA DENSITY, FISH/HECTARE: | TR VAL: | TS VAL: |
| -44 | 0 | 0.000 | 0 | 0.0558 | 6400 |
| -46 | 1 | 0.003 | 1 | 0.0782 | 5080 |
| -48 | 11 | 0.030 | 14 | 0.0948 | 4040 |
| -50 | 28 | 0.052 | 25 | 0.1084 | 3200 |
| -52 | 85 | 0.172 | 83 | 0.1199 | 2560 |
| -54 | 176 | 0.280 | 134 | 0.1300 | 2000 |
| -56 | 238 | 0.205 | 98 | 0.1389 | 1600 |
| -58 | 331 | 0.305 | 146 | 0.1468 | 1280 |
| -60 | 474 | 0.465 | 223 | 0.1539 | 1000 |
| -62 | 508 | 0.160 | 77 | 0.1603 | 800 |
| SINGLE FISH: | 1852 | TOTAL: | 802 FISH/HA. |
RELATIVE SIZEDISTRIBUTION OF FISH.
(THE NUMBERS GIVE PERCENTAGE OF TOTAL DENSITY)
