half-year_rep_cult_catfish_1987.pdf (741.0Kb)

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s

HALF-YEAR REPORT 1987.

OF THE. PROSJECT

"CULTIVATION OF CATFISH"

by

Erlend Moksness and Jakob Gj0seter Biological Station Fl0devigen

4800 Arendal

His0Y June 1987

1

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TABLE OF CONTENT

Page

Introduction 3

Meetings 3

Methods 3

Experimental groups 4

Collection of wild fishes spring-87 6

economy 6

Reports, Newspaper-article,radio-program etc. 7

Appendix (Terminated groups) 8

Appendix 1. 85-3 (spotted catfish) 8 Appendix 2. 86-2 (stripped catfish) 24 Appendix 3. 86-3 (spotted catfish) 35

References 36

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INTRODUCTION

The proj ect started 1. April 1987. From the same date two

technical Assistants, Evy Lien and Sissel Rosseland were employed in the project. Three students, Mr. Vorren, participated in the project from 21/4 to 1/5-1987 and Kad R0dland and Ania

Jablanska participated from 15/6 to 26/6-1987. The three first months of the project has concentrated on building up laboratory facilities and collection of local catfish. Installation of several new tanks has been delayed. These tanks are planned used mainly for the spawning stock.

MEETINGS

A steering group meeting were held at F10devigen 24/4-87.

A planning group, R. Hole (Skretting A/S), 0. Lie (Fiskdir.

Nutrition Inst.) and E. Moksness met 9. June in Stavanger and put together a proposal on "Foroptimalisering til Steinbit (Anarhichas sp .. ) i oppdrett" for the Norwegian Fisheries Research Board.

METHODS

The condition factor (C.F.) was calculated according to the formulae:

C.F.

=

^w

*

100 / 13 , where w

=

wet weight (g) and 1

=

^length

(cm).

The %-growth was calculated according to the formulae:

%-growth

=

(Wi + 1 - Wi)

*

100 / Wi , where Wi

=

average wet weight (g) at measurement L and Wi+ 1

=

average wet weight (g) at measurement i+1, used when groups are weighted every months.

At feeding the feeder gave an INDEX from 0 to 5 to indicate if the fishes were eating well or not. The highest score was 5. In the calculating of food factor (FC) an average feeding INDEX between each measurement of the fishes was calculated. This average INDEX was later used to calculate an FC based upon the INDEX.

The food factor (FC) were calculated according to the formulae:

FC

=

WP

*

a / WW

*

b, where WP

=

wet weight (g) of the wet pellets, WW

=

average increase in wet weight (g) of the fishes, a

=

dry weight/wet weight relationship of the wet pellets in that

specific period and b

= -

20 % (dry weight/wet weight relationship of the fishes).

Specific growth rate, SGR, were calculated according to the formulae:

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SGR

=

(Ln Wt2 - Ln Wtl) / (t2-tl), where Wtl and Wt2 are wet weights of fishes at days tl and t2.

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EXPERIMENTALS GROUPS

At present four different groups of catfish are studied, mainly to follow their growth. The groups are listed in Table 1. The specific growth rate (SGR), %-growth together with some weights are given in table 2 for three of the groups.

Two groups, 87-1 and 87-2, has been of specially interest to the project this spring. A egg-ball was caught near the Faeroe Island by a trawler (10/2-87) and the larvae hatched soon after (10-17/2 1987) in the Fishery Laboratory in Thorshavn. Maximum hatching were observed for three days, 12-14/2. Mean hatching date are set to 13/2-87 and defined as age day

=

^{O. ###}of the newly

hatched larvae were send Fl0devigen B.S. in two batches the 19/2 and 26/2 and at the laboratory mixed and divided into the two groups: 87-1 and 87-2. The differences between the two groups have mainly been that 87-1 has been startfeeded on Skretting "Elite Perle", while 87-2 have been startfeeded on Skretting "Elite Plus"

and Artemia nauplii. The results shows that of the two groups, 87-2 have had the best growth (SGR

=

^3.3%) and survival (approx. 60

%). In addition to growth and survival of the larvae groups (87-1 and 87-2), their behaviour were studied. In the following are some observation notified in the dairy:

1/3 - 7 dead larvae in 87-2 with food particle stuck to their body.

17/3 - The larvae in 87-1 followed the food particle sinking from surface to bottom and then eaten the food particle.

18/4 - The larvae in 87-2 eats the dry pellets floating in the surface, this was not observed in 87-1 where the larvae either eats the particle while it Sinks or lays on the bottom.

19/4 - The same observation as the 18/4

20/4 - "Elite plus" (0.6 mm) are hanging for a longer period in the surface than "elite pede" (0.6 mm).

22/4 - Stopped feeding 87-1 with "elite pede", started with "elite plus"

3/5 - A big larvae eating/ attacking a smaller larvae (half size) in 87-1

Artemia: 87-2 were fed newly hatched Artemia saUna nauplii from 9. March (3.75 g eggs/day) to 25. April (5.0 g eggs/day)

Table 1. Experimental groups of catfish by 15. June 1987.

Group Species Origin 86-(1+2) striped catfish

pellets

86-3 Spotted catfish pellets

87 -1 Striped catfish Dry pellets (Elite Plus 1.0)

Food type

S0dandet Wet Barent Sea Wet Faeroe Island

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87-2 " "

"

Table 2. The specific growth rate (SGR) in three of the groups during May 1987.

I/)

.c Q) I/)

;;:

-

^o

Z o

Group N %-growth SGR (%) Wt1-1gl

Day W t2~-I(~g),---_---"D=a:;l;,lyt.---lt=2~-t=1--,(~d~ay~s=)

86-346 29.6 0.90 24.48237 31.7 265 28 87-120 140.2 3.13 0.27374 0.655102 28 87-287 151.0 3.29 0.40274 1.008102 28

200~---~ 9

150

100

50

8 7 6

5

C 20 40 60 80 100120

Age in [

...~ _0.3 _0.6

..

^~_1.0

Q)

...

:::J

-

^cu

...

Q)

--

No. of fis c.. E Temperatl

Q)

I-

Figure 1. Temperature (OC) and number of survivals during

startfeeding in group 87-1. Period fed with Skrettlng "Elite Perle"

are indicated.

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IJ) Q) J:

IJ)

~

-

^o

Z o

200~---~9

150 8

7 100

6

50 5

C+-T-~~~~~~~~~~~4

C 20 40 60 80 100 120 Age in [

....

^~

...

0.3

....

Artemia 0.6

~

...

1.0

Q)

...

-

^cu

...

~

~ - No. of fis

E Temperatl

Q)

I-

Figure 2. Temperature (OC) and numbers of survivals during startfeeding in group 87-1. Period fed Skretting "Elite Plus" and Artemia saUna nauplii are indicated.

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COLLECTION OF WILD FISH SPRING-87

The collected fish have been divided into the following groups according to their weight (table 3). Most of the fishes greater than 3.0 Kg are to be put into a 2500 m 3 (ca. 500 m 2 ) concrete outdoor basin. The fishes will be observed by underwater video-equipment and divers

Table 3. Number of fishes in different size groups by the 12. June 1987.

Group (Kg)

0.5 - 1.0 1.0 - 1.5 1.5 - 2.0 2.0 - 2.5 2.5 - 3.0

> 3.0

ECONOMY

Number 13

41 36 26 23 110

The proj ect started 1. April 1987 with the second quarter as the main investment period. There has been a delay for about three mounts in the main investment post, the tanks. The table 4 gives an overview of the economical situation by the 12. June 1987. All numbers in Kroners (NKr.)

Table 4. An economical overview by 12. June 1987.

Post Used Budget (1987) Project-Ieader5000.00 15000.00

Overtime 60000.00

Traveling 0.00 40000.00 General 2907.40 70000.00

Div. 3084.50 70000.00

Buying fish39323.64 100000.00

Food 44.50 25000.00

Data 65483.50 80000.00 Investments206484.13685000.00

Sum 322327.67 1.145000.00

SpeCification of investments

Tanks equipments 78125.93 300000.00 Food auto 9040.80 35000.00

Pumps 0.00 15000.00

Div. build. 0.00 35000.00 Data 50000.00 50000.00 Div. Lab. 34062.50 100000.00 Video equip.29909.90 100000.00

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Alarm sys. 0.00 50000.00

Sum 206484.13 685000.00

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REPORTS; NEWSPAPERARTICLE; RADIOPROGRAM Agderposten 2/2-87. Fl0devigen nye oppdrettsfisk Agderposten 9/3-87. Steinbit hos gynekologen

A-Magasinet Nr. 3/87: side 20. Nye husdyr i havbruket

Fedrelandsvennen 29/4-87. Steinbit -ny. lovende oppdrettsfisk:

Selges ikke pa trynefaktoren.

Fiskaren 29/4-87. "Er jeg gravid doktor ?" Med fru Steinbit til gynekologen.

Lillesandposten 30/4-87. Forskningsstasjon viI ha levende steinbit

Nordisk Aquakulture Nr. 1/87: 12-13. Nye marine arter: Stygg som steinbit.

NTB-reportasje (Mars/April). Steinbiten - den nye

oppdrettsfisken (Publ. i en rekke av landets aviser. (b1.a. Nordlys.

Sunnm0reposten. Fedrelandsvennen, Vart Land, Tiden) Varden 11/3-87. Krager0-steinbiten far sin "brudesuite"

NRK radio PI "Kolumbus" , 30 min. Kl. 1920 27/5-87.

Moksness, E. og J. Gj0seter 1987. Progress Report 24/4-87. 3 pp.

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APPENDIX : TERMINTATED GROUPS

APPENDIX 1: The 85-3 group

Materials

During a cruise with R/V "G.O.Sars" from 20 August to 5 September 1985 in the Barent Sea, 35 live spotted catfish juveniles (A. minor) were caught. The juveniles were taken in the upper 60 m with a pelagical trawl towed with a speed of 3 nM. The salinity and temperature in the sampling area were around 33 0/00 and 7.5 0C respectively (Anon. 1985). The juveniles were transported to the laboratory at Fl0devigen Biological Station and dived into three groups: 85-1, 85-2 and 85-3. Of these three groups, the juveniles in 85-3 were the one with best growth. The experiment started 12 September 1985, defined as day O. Table 1 gives the corresponding dates to the number of days in experiment. The two groups, 85-1 and 85-2, were kept in tanks of 500 I during the experiment, while 85-3 was transferred from 500 I tank to a 2500 1 tank after 431 days (Table 2). The two groups, 85-1 and 85-2 were terminated after 207 (7/4-86) and 237 (7/5-86) days respectively.

The remaining fishes in these two groups were transferred to a predator experiment, 86-1. The group 85-3 were terminated after 508 days (2/2-87), when a accident killed them all.

The salinity were stable around 33 ^0/00during the whole experimental period, while the temperature varied from 3.9 QC in the winter to 13.5 QC in the summer with a average of 8.8 QC in the whole period (Fig. 1).

Results Growth

The growth in length and wet weight are given figure 2, 3 and 4.

Growth in relation to temperature are given in Fig. 5 and 6. The figures indicates reduced growth i the periods 175 - 250 and 350 - 450 days. There is no indication that this reduction in growth are related to temperature. Length/weight relationship is given in Fig.

7 with equation expressing the curve.

Growth rate

The %-growth curve of the fishes together with observed temperature are given in Fig. 8, while Figs. 9 and 10 gives the %- growth together with observed average length and wet weight respectively. The figures indicates an rather high growth rate initially, then the growth rate dropped with decreasing

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temperature. A later increase in temperature did not make the growth rate increase.

Condition factor

The observed average condition factor of the fishes together with observed temperature and average wet weight are given in Figs. 11 and 12 respectively. The figures indicates a low condition factor (below 0.95) in periods with slow growth.

Feeding

Table 3 gives the menu for the fishes in group 85-3. The composi- tion of the wet pellets are also indicated. The amount of wet pellets fed the fishes are given in Fig. 13. There is no positive correlation between amount of wet pellets and the temperature.

Figs. 14, 15, 16 and 17 gives the observed amount of wet pellets fed the fishes, the amount of wet pellets per fish fed together with the the average length and wet weight of the fishes. The figures indicates a positive correlation between the size of the fishes an the amount of food fed them. As indicated in Fig. 18, there is a also a positive correlation between amount of wet pellets per fish and the fishes growth rate. Table 4 indicates that the food factor (FC) of the spotted catfish might be below 2.0.

The 85-1. 85-2 and 85-3 groups

Numbers

The survivals in the three groups are given in figure 19. Mortality was only observed to some extent in 85-1, while in 85-2 the numbers were reduced with almost 50 % over 200 days. All the juveniles died accidently, when the tank fell down. Average Length, wet weight, condition factor and %-growth are given in Fig. 20, 21, 22 and 23 respectively.

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TABLES

Table 1. Codesponding dates to number of days in experiment.

Days in Experiment Date

o

12/9-85

50 1/11-85

100 21/12-85

150 9/2-86

200 31/3-86

250 20/5-86

300 9/7-86

350 28/8-86

400 17/10-86

450 6/12-86

500 25/1-87

Table 2. Period of experiment (Days in experiment) the fishes spend in different tanks.

Group 85-1 85-2 85-3

500 1 1 0-207 0-237

0-431 431 - 508

Table 3. Type of food fed the fishes in different periods (days of experiment) .

Period

o -

¹⁷⁶

176 - 237 237 - 267 267 - 308 308 - 508

Food-type wet pellets dry pellets fish meat

experimental wet pellets wet pellets

*

Consisted mainly of macrell (- 48 %), Shrimps (- 24 %),

"bindemiddel, Skrettlng 25 %" (- 29 %), vitamin E+ and vitamin C.

Dry weight of the wet pellet around 50 %.

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Table 4. Different calculated food-factor (Fe). Dry weight of fish - 20 % and of the wet pellets from 40 to 55 %.

Average food-factor

Period INDEX Real numbel s 30 % INDEX %-

g rowth

308 - 333 2.7 3.32 2.33 l.8 24.8

333 - 362 2.4 36.05 25.33 17.3 1.37 362 - 390 l.83 2.78 l.95 l.02 13.1 390 - 418 l.79

418 - 445 2.75 ^/ 8.07 5.65 4.44 9.86

445 - 480 3.75 3.63 2.54 2.72 44.8

480 - 508 2.75 5.19 3.64 2.86 24.73

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FIGURES

14

12

6 ₀ ₁₀

- e

::J 8

1ii

...

_Q)

c.. E

~ ⁶

4

2

0 100 200 300 400 500 600

Days in Experiment

Figure l. The observed temperature in the experiments.

45 40 35

E ³⁰

~ 25

.£:. .-

0) c: 20

~ 1 5 1 0 5 0

0 50 100 150 200 250 300 350 400 450 500 550 Days in Experiment

Figure 2. Average length (cm) with standard deviation of fishes in 85-3.

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El

.c +-' C)

'0)

3:

~ +-'

1000 900 800 700 600 500 400 300 200 100 0

0 50 100 150 200 250 300 350 400 450 500 550 Days in Experiment

Figure 3. Average wet weight (g) with standard deviation of fishes in 85-3.

50 1000

40 800

-

^E^(,) ³⁰ ⁶⁰⁰

- -

1: ^C)

-

^C) ^-a- Length (cm)

..c

-

^C) 'Qj Wet Weight (g)

20 400 3:

...

r: Cl)

~

....I

10 200

0 0

0 100 200 300 400 500 600 Days In Experiment

Figure 4. Combined average length and wet weight of fishes in 85- 3.

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14 50

12 40

0 ₀ ₁₀

- _e

³⁰

-

^Eu

::l

-

Temperature

e

_Q) ⁸ ^~^..-

20 ^C)

...

Length (cm)

c.. ^c

E 6 ~

Q)

I-

4 10

2 0

0 100 200 300 400 500 600 Days In Experiment

Figure 5. Temperature and average length (cm) of fishes in 85-3.

14 1000

12 800

-

0 ⁰ 10

-

^.9

- e

⁶⁰⁰ ^~^..-

::l 8 ^C) Temperature

..- _"a;

e

Q)

400

s: ...

Wet Weight (g)

c.. Gi

E 6

Q)

s:

I-

4 200

2 0

Figure 6. Temperature and average wet weight (g) of fishes in 85-3.

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y = 3.9924 * 10"(0.0588x) R = 0.97

1200 Y = -87.1711 + 15.41 09x - 0.7874x"2 + 0.022x"3 R = 0.99 1000

-

^Cl ⁸⁰⁰

- -

..c Cl 'Qj 600

3:

li ₄₀₀

3:

200 0

0 10 20 30 40 50

Length (cm)

Figure 7. Length/wet weight relationship of fishes in 85-3.

14 100

90

12 80

-

⁷⁰

u ₁₀

0 60

-

~ ..c

::I 50 ~ Temperature

...

_e

₈ ₄₀

e

---

^%-growth

Q)

1

c.. 30

E 6

Q) 20

I-

4 10

0

2 -10

0 100 200 300 400 500 600 Days in Experiment

Figure 8. Temperature and % growth of fishes in 85-3.

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50 200 40

-

^E_u ³⁰ ¹⁰⁰ ^.c

- ~

-a- Length (cm)

.c

-

^C)_c 20

^...

^fj»

...

^%-growth

j 0 ^'<fl.

10

0 -100

Figure 9. Average length (cm) and % growth of fishes in 85-3.

1000 ~---~200

-

^C) 800 ¹⁰⁰

-

⁶⁰⁰

-

.c C)

~

₄₀₀

:s:

4)

.c ~ -a- Wet Weight (g)

1

2

^...

^%-growth

0 200

o -100

o 100 200 300 400 500 600 Days In Experiment

Figure 10. Average wet weight (g) and % growth of fishes in 85-3.

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14 1.2 12

-

1.1

0 0 10

-

I!!

:::J

8 1.0 u: Temperature

e

Cl) ⁰

_...

_{C.F .}

c.. E 6

Cl)

I- 0.9

4

2 0.8

Figure 11. Temperature and average condition factor (C.F.) of fishes in 85-3.

-

^-9

_-

..c:

~

C'I

di

==

1000 . . , . - - - . . . , . . . . 1 . 2

800 1.1

600

1.0 400

200 0.9

o ^0.8

o 100 200 300 400 500 600 Days In Experiment

u:

o

^-a- Wet Weight (g) ... C.F.

Figure 12. Average wet weight. (g) and average condition factor (C.F.) of fishes in 85-3.

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14 ~---~400

12

-

⁽⁾

_-

⁰ ¹⁰ 300

-

^.9

~ ::l

-e

_Q) 8

III

200 ]! Temperature c.. Qj ^..0- Wet Pellets (g) c.. E 6

Q)

3: 4i

I- 100

4

2 4-~~~---~~~~~~0

Figure 13. Temperature and amount of wet pellets (g) fed the fishes in 85-3.

400~---~

44 300 42

-

^Cl

-

_]!^III

Qj 200

Il.

3: 4i

100

40

-

^E

38

-

_..c^(,) Wet Pellets (g)

..-

...

Length (cm) 36 ^Clc

Q)

..J

34 32

04---~~--~--~----~---+ 30

300 400 500

Days In Experiment

Figure 14. Average length (cm) and amount of wet pellets fed the fishes in 85-3.

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-

^E

~

..c

-

^Cl^c:

j

40 ~---~~30

38

20 36

34

10 32

30 ~~--~~~~--~-T--T-~O

300 350 400 450 500

... Length (cm) W.PelletlFish

Figure 15. Average length (cm) and amount of wet pellets/fish fed the fishes in 85-3.

400~---r 1000 300 800

-

^~_(J)

-

⁶⁰⁰

^-

^..c

^-

^Cl

~ 200 a. Qj

~

Cl Wet Pellets (g)

~ ...

Wet Weight (g) 400 G)

100 3:

200

O~--~-U--~--~----~---+ 0

300 400 500

Figure 16. Average wet weight (g) and amount of wet pellets fed the fishes in 85-3.

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-

.9 ...- .r::::

'0) Cl

3:

Qj

3:

800 ~---~30

700

20 600

500

10 400

300 ~~--'-~~-r--T-~--~--r0

300 350 400 450 500

Days In Experiment

. . Wet Weight (g) W.PelletlFish

Figure 17. Average wet weight (g) and amount of wet pellets/fish fed the fishes in 85-3.

400~---r 100 90 80

300 70

-

^Cl

-

_]i^III ⁶⁰

Qi 200 c.

50 40

Qj 30

3: 100 20

10 0

o~--~~~--~--~--~---+ -10

300 400 500 600

.r::::

i

e

t(>

'#.

Wet Pellets (g) . . %-growth

Figure 18. Amount of wet pellets (g) fed the fishes in 85-3 and their %-growth.

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16

14

~ 12

Q) -Ill- # 85-1

.0

E

...

#85-2

::s ₁₀ _-M- _#85-3

z

8

6

0 100 200 300 400 500 600

Days In Experiment

Figure 19. Numbers of survivals in the three groups of spotted catfish; 85-1, 85-2 and 85-3.

, 25

20

-

^E() ¹⁵

-

.c ....

Cl 10

c Q)

..J

Figure 20.

catfish.

o 25 50 75 100125150175200225250 Days In Experiment

-Ill- Length 85-1

... Length 85-2

-a- Length 85-3

Average length (cm) in the three groups of spotted

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150

-

^Cl

- _-

¹⁰⁰

.c _Cl -a- Weight 85-1

'Q)

...

Weight 85-2

~ -a- Weight 85-3

Q)

3: ₅₀

O~~~-r~~-T~~~-r~~~-r~

o 255075100125150175200225250

Figure 21. Average wet weight (g) of the fishes ⁱⁿthe three groups of spotted catfish.

1.2

~ 1.1

d _1.0

- ^...

0

U -a- C.F.85-1

If ^0.9

...

C.F.85-2

c 0 -a- C.F.85-3

:B 0.8

"C 0 c

u _0.7

0.6

0 100 200 300 400 500 600

Figure 22. Average condition factor (C.F.) in the three groups of spotted catfish.

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160 140 120 100 ..c:

i ⁸⁰ ^-Ill- %-Gr. 85-1

e

60

(!)

~ ₀I

40

-+ %-Gr. 85-2 -11- %-Gr. 85-3

20 0 -20

0 100 200 300 400 500 600

Figure 23. %-growth (%-gr.) in the three groups of spotted catfish.

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APPENDIX 2: THE 86-2 GROUP

The fishes in 86-2 were collected in April/May 1986 and came from southern Norway. Table 5 gives the corresponding date to the numbers of days in experiment.

RESULTS

The fishes were kept for the whole experimental period (280 days) in a tank of 5000 I (3 m in diameter), (Table 6) and fed mainly wet pellets (Moksness og Gj0seter 1987) (Table 7). The obtain food factor (FC) was rather height indicating that to much food were fed the group (Table 8). The %-growth was rather low indicating slow average growth in the group, but the results are also disturbed by a high mortality (fig. 24) in the group, mainly as results of an

accident, as the tank was emptied for water one night. In the group as a whole a low condition factor (CF) (below 0.9) were observed during the experimental period (Fig. 34 and 35). Dead fishes in the tank were observed with a average CF of 0.83 (table 9)

Table 5. Corresponding dates to days in experiment i 86-2.

riment Date

Table 6. Days in and size of tank.

Group 86-2

6/5-86 25/6-86 14/8-86 3/10-86 22/11-86 11/1-87

50001..1 0-268

Table 7. Different food types for 86-2

(testing)

Period 0-73 73 - 268

Food e

Macrell meat/wet pellets wet pellets (as for 85-groups)

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Table 8. food-factor (FC) of fishes in 86-2.

Period Averafle INDE

k

0-31 31 - 72

%-Q'rowth

72 - 157 4.2 157 - 217 2.31

217 - 268 11.42

- 14.86 3.82 2.6

food -factor

Total Fr 30 %

- 10.4

INDEX

8.92 11.83

Table 9. Condition factor (CF) observed on some dead fishes in 86- 2.

Number CF

1 0.42

2 0.79

3 0.81

4 0.82

5 0.90

6 0.96

7 0.96

8 1.00

Average 0.83

Data from "86-2.alle data"

12 60

10 50

U 0 8 40

2! I!!

:J G)

Temp

e

G) ^c..E ⁶ ³⁰ ^..Qz E ^:J

-

^Antall

G) 4 20

I-

2 10

0 0

0 100 200 300

Fig. 24. Observed temperature (OC) and numbers of survivals in 86- 2.

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70

65

i ^f ¹

60

f- ¹

55 50

E ⁴⁵

~ 40 .c ^+-'_Cl 35

c:: 30

Q) ...J

25 20 15 1 0 5 0

20 40 60 80 100 120 140 160 180 200 220 240 260 280 days in Experiment

Figure 25. Average total length (cm) with Standard deviation (SD) of fishes in 86-2.

3000

2500

--

2000

-

§ ^....!

~ ¹⁵⁰⁰

er

^~)

Q)

~ .L.

--

1000

_.

500

O+-~'-I~~~.-.~.-~r-~r-~~~~~r-~~~~~I~-+

20 40 60 80 100120140160180200220240260280

days in Experiment

Fig. 26. Average wet weight (g) with standard deviation (SD) of fishes in 86-2.

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60~---r1900

59 1800

-

^E(,)

-

^E(,)

- -

Lenght (cm)

-

⁵⁸ ¹⁷⁰⁰

-

^-Ill-

.c .c

Cl Cl

....

Weight (cm)

c Q;

.3 3:

57 1600

56 -t--'"'"""T"""----r---r---,---.----+ 1500

o 100 200 300

Fig. 27. Combined average total length (cm) and average wet weight (g) of fishes in 86-2.

12 ~---~--~---~60

10

59

G) 8

...

::J

10

...

₆

G) Q.

~ E 4

-

^E

~ Temp .

58

-

^.c^Cl

....

Lenght (cm) c G)

..J

57 2

0 ~~""T"""----r---~--~--~--~56

0 100 200 300

Fig. 28. Temperature (OC) and average total length (cm) of fishes in 86-2.

(32)

12 ~----~---'"'T" 1900 10

1800

2! ⁸

- ^e

::l _G) ₆

-

_~^E

1700

-

^..r:::: ^Temp.

c.. E

G) 4

I-

Cl

...

Weight (cm)

'G)

1600 ==

2

0 4--~-~---~-~--~1500

0 100 200 300

Days In Experiment

Fig. 29. Average wet weight (g) and temperature in 86-2.

y = ^65.8395* 10"(0.0239x) R = ^0.96

Y = -3820.7529 + 217.9886x - 4.1276x"2 + 0.0343x"3 R = 0.96

4000~---~

3000

-

^Cl

- -

²⁰⁰⁰

..r::::

~

Cl

•

1000

O~~~~----~~~--~---~--~~

30 40 50 60 70 80

Length (cm)

Fig. 30. Length/weight relationship of fishes in 86-2.

(33)

12 20 10

10

Q) 8

...

_.c

:::J

- ^e

Q) _c.. 6 0 ⁱ

e

^Temp.

~

...

^%-growth

E fI.

Q) 4

I-

-10 2

0 -20

0 100 200 300

Days in Experiment

Fig. 31. Temperature and %-growth of fishes in 86-2.

60~---~20

59 10

-

^Eto) ^.c

-

i Lenght (cm)

-

⁵⁸ ⁰

^e

^-Ill-

.c

Cl ~

...

^%-growth

c: Q) fI.

..J

57 -10

56~--~---r--~--~----r---+-20

o 100 200 300

Days in Experiment

Fig. 32. Average total length and %-growth of fishes in 86-2.

(34)

1 9 0 0 . - - - , - 20

1800 10

-

^E() ^..c

- ^....

¹⁷⁰⁰ ⁰ i

_e

^-Ill- Weight (cm)

..c C) Ij»

...

^%-growth

~

^'#

1600 -10

1500 -t---W--"""T""---.----r---.----+ -20

o 100 200 300

Days In Experiment

Fig. 33. Average wet weight (g) and %-growth of fishes in 86-2 .

. - - - r - : - - : - - - r 1.0

0.9

+---w---r---r---.---.---4- 0.8

100 200 300

Days In Exprlment

u.: o

_-0- ^Temp._C.F.

Fig. 34. Temperature and average condition factor (CF) of fishes in 86-2.

(35)

1900 ,....---~ 1.0

1800

-

_~^E

...

1700 0.9

u:

^-Go Weight (cm)

.c Cl cJ

...

C.F .

'0)

3:

1600

1500 -+--""T""---,..---.----,....---r-~ 0.8

o 100 200 300

Days In Experiment

Fig. 35. Average wet weight (g) and average condition factor (CF) of fishes in 86-2.

12 10

~ 8

:::J

iU

...

_Q) ₆

a.. E

~ ⁴

2 0

~---~~---~3000

2000 §

Q)

~

a..

1000 ~

~--""T""-~-~~~~~----r0

0 100 200 300

Days In Experiment

Temp . ... Wet pellets (g)

Fig. 36. Temperature and amount of wet pellets ^(g) fed fishes in 86-2.

(36)

3000~---~60

59

c; 2000

-

^t/I ^E^(.)

~ 58

- -

^-a- Wet pellets (g)

Q; .c

c.. ^C)c

...

Lenght (cm)

-

^Q) ¹⁰⁰⁰ ^j

3: 57

0~-1~---r---r--~~~~~56

o 100 200 300

Fig. 37. Average total length (cm) and amount of wet pellets (g) fed fishes in 86-2.

60~---~ 60 50 59

40 _.c

t/I

30

~

^-Go Lenght (cm) Q;

...

W.Pelletlfish c..

E (.)

- _-

⁵⁸

.c C)

c

20

;:

Q)

...J

57

10 0

o 100 200 300

Fig. 38. Average total length (cm) and amount of wet pellets/fish (g) fed the fishes in 86-2.

(37)

3 0 0 0 . . , . . . . - - - . - 1 9 0 0

1800

-

^C) ²⁰⁰⁰

_-

-

^I/) ^E

]i ^~

1700

-

^-Go Wet pellets (g)

Qj .J:

Q. ^C)

....

Weight (cm)

l) 1000

~

3:

1600

o +--""T"""--r--"""T""-r.:&.,=~""_=¥'I.:L----+ 1500

o 100 200 300

Fig. 39. Average wet weight (g) and amount of wet pellets (g) fed the fishes in 86-2.

1 9 0 0 . . , . . . . - - - . - 60 50 1800

-

^E_u

- -

¹⁷⁰⁰

.J:

C)

'Q)

3:

40 _.J:

I/)

5

_-Go Weight (cm) 30 .!!

Qj

....

W.PelleVfish

Q.

20

;:

1600

10

1500~-""T"""-~-"""T""-~~~-~ 0

o 100 200 300

Fig. 40. Average wet weight (g) and amount of wet pellets/fish (g) fed fishes in 86-2.

(38)

20~---r 60 50 10

40 _or.

1/1

30

:;::

~ ^-0- ^%-growth

Q) W.PelleVfish

c...

20

:=

-10

10

-20~--~---r--~--~---T--~ 0

o 100 200 300

Fig. 41. Amount of wet pellets (g) fed fishes in 86-2 and their %- growth.

(39)

Appendix 3: The 86-3 group

The group consisted of 7 spotted catfish, collected during cruises august/September 1986 with R/V "G.O. Sars" and R/V "Eldjarn" in the Barent Sea (Anon. 1986). The experiment started 6/8-86, defined as day 0 in the experiment. All seven fishes died accidently, when several tanks collapsed in January 1987. The seven fishes -s life history in the laboratory are given in table 10.

The fishes had a SGR for the whole experimental period of 1.75

%/day.

Table 10. The life history in the laboratory of fishes in 86-3.

Days in

EX:Qeriment Length {cm} weight {g} CF %-

growth SGR

0 8.97 6.9 0.95

27 11.79 17.0 1.03 145.5 3.3

56 25.2 47.8 1.4

83 36.3 44.0 1.4

118 18.5 66.7 0.99 75.5 1.6

146 20.8 89.4 0.98 40.5 1.2

14 12

Q)

...

_::::J ₁₀

- ^e

^Q)

E c. 8

Q)

I-

6 4

0 100 200

Days In Experiment

Figure 42. The observed temperature in experiment 86-3.

(40)

y = 1.1843 * 10"(0.0914x) R = 0.99

Y = 5.867 - 1 .549x + 0.1285x"2 + 0.0066x"3 R = 0.99 140

120

-

^C) 100 ⁸⁰

- -

..c:

C) 60

'Q)

3:

40 20 0

o 10 20 30

Length (cm)

Figure 43. Length/weight relationship of fishes in 86-3.

References

Anon. 1985. Preliminary report of the international O-group fish survey in the Barent Sea and

adjacent waters in August-September 1985. ICES CM 1985/G:75 : 1-27.

Anon. 1986. Preliminary report of the international O-group fish survey in the Barent Sea and adjacent waters in August-September 1986. ICES CM 1986/G:78 : 1-27.

Moksness, E. og J. Gj0seter 1987. Arsrapport 1986 pa prosjektet

"Oppdrett av Steinbit" til BPNorge A/S.