CM_1985_G_23.pdf (636.1Kb)

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TAGGING OF SAITHE ON THE NORWEGIAN COAST IN 1978-1980

ABSTRACT

by Tore Jakobsen

Institute of Marine Research P.O.Box 1870, 5011 Bergen-Nordnes,

Norway

Continuing a series of tagg ing experiments cover ing most of the Norwegian coast each year since 1972, 15 038 saithe were tagged in inshore localities in 1978-1980. In addition, 1494 «ai the caught by trawl were tagg ed on the coastal banks at about 63 N in 1980.

The results general ly confirm the migration pattern from the earlier experiments. There is some evidence of migration from the coastal banks to more shallow waters, which is opposite to the general direction.

INTRODUCTION

From 1954 to 1982/ saithe tagging was carried out each year on the Norwegian coast. Results from the experiments 1954-1964 have been reported by Olsen (1959a, b, 1961) and Anon. (1965). Before 1972/

most of the tagging was carried out in northern Norway, but in the period 1972-1980/othe experiments were extended to cover the whole coast north of 59 N. Results of the tagging experiments 1970-1977 have been presented by Jakobsen (1978a, b, c, 1981). In this paper/ results of the tagging experiments 1978-1980 are presented.

In addition to the usual tagging of young saithe caught by purse seine in inshore areas, s~ithe caught by trawl were tagged on the coastal banks at about 63 N.

MATERIAL AND METHODS

Details of the saithe tagging experiments 1978-1980 are given in Table 1. A total of 15 038 saithe were tagged in inshore localities, 7100 in 1978, 4638 in 1979, and 3300 in 1980. The saithe were from commercial purse seine catches, except for one catch taken by hand line. In each experiment between 400 and 601 saithe were tagged. The areas of releaee were scattered along the whole Norwegian coast north of 59 N. The tagged saithe were predominantly immature 2-4 year old fish. In 1980/ J494 saithe from nine trawl hauls on the coastal banks at about 63 N were also tagged. The size was mostly 38-49 cm and the dominating age group was 3 years. In all the experiments hydrostatical tags of Lea's type were used, fastened to the fish with a qut in front of the

anterior dorsal fin. .

The data include all recaptures reported up to 1984. Of the 2124 recaptures, 40 were tagged in the trawl experiments.

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RESULTS

The geographical distribution of the recaptures from each experiment is shown in Figs 1-29. In many of the experiments a significant number of the recaptures had to be omitted from the figures because of inadequate or no information about the locality. However, most of these appear to have been caught near the tagging locality.

Tagging experiments in 1978

Typically, the recaptures from the experiments south of 62⁰N in May-June are distributed both north and south of the tagg ing localities (Figs 1-3). Compared to the experiments 1972-1977 (Jakobsen 1978a, 1981), the preference to move south appear to be less pronounced. However, the large changes in the saithe fisheries in the North Sea after 1976 in all probability have had an effect on the distribution of the recaptures, and it is therefore difficult to draw firm conclusions about changes in the migration pattern.

The results of experiments between 63⁰N and 68⁰N are shown in Figs 4-6. The two northernmost of these experiments show patterns similar to the earlier experiments (Jakobsen 1978b, 1981), whereas the southernmost experiment (Fig. 4) is atypical in showing evidence only of short range migration.

The experiments north of 68⁰N (Figs 7-10) also showa distribution of recaptures similar to the earlier experiments (Jakobsen 1978c,

1981). The relatively few examples of long range migrations in Fig. 8 are probably due to the bct that the fish tagged in this experiment were general ly smaller than in the other experiments and therefore likely to stay longer in the tagging area.

Tagging was also carried out in three localities south of 62⁰N in December (Figs 11-13). The distribution of the recaptures are not significantly different from the May-June experiments.

The experiments in 1979 (Figs 14-21) gave results which did not differ very much from those in 1978. Worth noting is the concentration ~f recaptures in the Shetland area from the experiment at 70 08¹N (Fig. 20). Recaptures from this area was reported each year from 1980 to 1984.

The experiments in 1980 on the whole gave few recaptures.

Es~eciallY the purse seine (and hand line) experiments south of 69 N gave unusually low recovery rates, 2-5 per cent, and there is no readily apparent explanation for this. A low rate of recovery, 2.7 per cent, was also found in the trawl experiments, but this was to be expected since the fish were caught at much larger depths (about 150 m) and therefore less likely to survive the

tagging . \"

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The purse seine and hand line experiments show distributions of recaptures similar to those in 1978 and 1979 (Figs 22-28), The trawl experiments represent the largest number of saithe from trawl catches tagged in Norwegian waters (Fig. 29). The distribution of the recaptures is similar to the usual from purse seine experiments in the area, but in addition there is evidence of a significant migration from the coastal banks to more inshore areas which is opposite to the general direction of migration.

DISCUSSION

The tagging experiments in 1978-1980 give no eviden.ce of major changes from the migration pattern shown by the experiments in 1972-1977. There is stilJ a significant migration of young saithe from the area north of 62 N to the North Sea and ther~ is also some migration from the west coast to areas north of 62 N. Part of the spawning migration from northern Norway extends into the North Sea.

The evidence of migration from the coastal banks to inshore areas means that the saithe contrary to what the purse seine experiments have indicated, may be caught by purse seine also after they have be en exposed to trawlers. The exploitation of saithe in the trawl fishery will therefore have some effect on the purse seine fishery. However, the effect must be relatively small because there is evidently a clear tendency for the saithe to mo ve away from the coast when a certain size has be en reached, and this is reflected in the general ly larger size of saithe on the banks than in more coastal areas.

REFERENCES

Anon. 1965. Report of the Coalfish Working Group. Co-op. ResL

Rep. int. Coun. Explor. Sea, Ser. A, 6: 1-23.

Jakobsen, T. 1978a. Saithe taggin8 experiments on the Norwegian west coast south of 62 N, 1972-74. Coun. Meet. int.

Coun. Explor. Sea, 1978 (G:32): 1-13.

Jakobsen, T. 1978b. Saith~ tagging e~periments on the Norwegian coast between 62 N and 67 N, 1971-74. Coun. Meet.

int. Coun. Explor. Sea, 1978 (G:33): 1-9.

Jakobsen, T. 1978c. Sa~the tagging experiments in northern Norway north of 68 N, 1970-74. Coun. Meet. int. Coun. Explor.

Sea, 1978 (G: 34): 1-14.

Jakobsen, T. 1981. Preliminary results of saithe tagging experiments on the Norwegian coast 1975-77. Coun. Meet.

int. Coun. Explor. Sea, 1981 (G:35): 1-6, 1 table, 18 figs.

Olsen, S. 1959a. Migration of coalfish (Gadus virens L.) from Norway to Faroe Islands and Iceland. Coun. Meet. int.

Coun. Explor. Sea, 1959 (12): 1-5.

Olsen, S. 1959b. Preliminary results of the Norwegian coalfish taggings 1954-58. Coun. Meet. int. Coun. Explor. Sea, Olsen, 1959 (114): 1-7.

S. 1961. An account of the Norwegian coalfish investigations with special reference to the tagging experiments. ~Co~uwn~.~~M~e~et~.~i~n~t~.~C~o~u~nu, __ ~Ex~p~l~our~. __ ~Se~aaL'

1961 (125): 1-8.

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Table 1. Saithe tagg ing experiments on the Norwegian coast 1918-1980.

Nos Size Recaptures

Date Position Gear relased range Per cent

(cm) 78 19 80 81 82 83 84 ? Total

30.5.18 N590 04' E050 26' P.seine 600 31-46 36 32 15 1 1 -

-

- 85 14 31.5.18 N590 53' E050 05'

..

₅₉₉ _33-43 ₃₈ ₃₂ ₁₃ ₅

2 - ¹ - 91 15

1.6.18 N61011' E04038'

..

₆₀₁

29-44 53 20 11 2 4 -

- -

⁹⁰ 15

14.6.78 N63004' E01034'

..

₆₀₀ _29-44 ₅₀ ₂₂ ₁₂ ₂

_-

_- _- _-

86 14

1.6.18 N64020' El0028'

..

₆₀₀ _35-49 ₃₉ ₄₄ ₁₃ ₂ ₂ ₁ _-

-

¹⁰¹ ¹¹

9.6.18 N61018' E13043'

..

₆₀₀ _33-49 ₄₅ ₃₈ ₁₅ ₂ ₄ ₂ ₁ ₂ ₁₀₉ ₁₈

2.8.18 N68049' E16006'

..

₅₀₀ _32-56

63 41 14 1 2 3 1 1 132 26

22.8.18 N10046' E23023'

..

₅₀₀ _30-63 ₃₈ ₂₁ ₁ ₃ _- ₁

-

⁶ ¹⁶ ¹⁵

10.8.78 N10053' E28025'

..

₄₁₅ _43-18 ₁₂ ₃₅ ₁₂ ₄ ₁ _- ₁ ₁ ₆₆ ₁₄

11.8.18 N10004' E30004' .. ₅₂₅

35-69 11 29 41 2 - ^- ^- ¹ 84 16

13.12.78 N590 49' E050 05'

..

₅₀₀ _31-46 ₁₁ ₈₇ ₁₈ ₈

2 1 - 2 129 26

16.12.78 N61002' E0403"

..

₅₀₀ _29-44 _- ₂₂ ₁₃ ₁ ₃

1 -

-

⁴⁰ 8

12.12.78 N61059' E05011'

..

₅₀₀ _28-42 _{1 106} ₁₀

3 3 1 - ¹¹ 135 21

28.8.79 N600 00' E050 28' P.seine 439 28-50 10 29 20 5 1 -

-

⁶⁵ ¹⁵

29.8.79 N61011' E04038'

..

₅₉₉ _31-41 _- ₂₂ ₃ ₅ _- _-

-

30 5

3.9.79 N62059' E01052'

..

₆₀₀ _31-49 ₂₂ ₄₃ ₂₄

11 4 - 1 105 18

1.9.19 N6504S' E1201S'

..

₆₀₀ _27-51 ₁₀ ₁₉

2 2 4

-

¹ ³⁸ 6

10.9.79 N61040' E14044' ^N 600 35-51 4 60 37 13 4 2

-

¹²⁰ ²⁰

12.9.79 N68041' E14025'

..

₆₀₀ _35-56 ₃ ₁₇

4 2 2 - ¹ 29 5

25.9.19 N70008' E1S059'

..

₆₀₀ _46-13 ₁₆ ₄₁ ₂₇

9 8 5 5 111 19

20.9.79 N10057' E25031' .. ₆₀₀ _38-60

119 45 3 1 - ¹ 2 111 29

4.8.80 N60020' E050,,' P.seine 500 27-35 4 13 1 1 - - 19 4

5.8.80 N60057' E04049' H.line 500 30-39 2 3 3 1

- -

⁹ ²

12.8.80 N64020' El0026' P.seine 500 29-50 8 13 3 2 1 - 27 5

14.8.80 N61043' E14030' .. ₅₀₀ _30-54 _-

3 3 - 3 - 9 2

18.8.80 N68050' E16021'

..

₄₀₀ _45-65 _-

1 5 2

-

- 14 4

22.8.80 N70008' E19059'

..

₅₀₀ _35-65 ₁₁

31 15 4 1 - 62 12

26.8.80 N7100S' E2S028'

..

₄₀₀ _41-14 ₁₅ ₁₁ ₉

6 2 - 51 13

24.6.80 N62!lS" E05!l30' B.trawl 81 32-62 -

-

¹ ^- ^- ^- ¹ ¹

25,6.80 NS30 01' E050 29'

..

₁₁₅ _29-56 ₁ _-

_-

2 -

-

3 3

25.6.80 N62!lS3' E05033'

..

₂₄₅ _32-S7 ₅

7 1 - - - 13 5

27.S.80 N62053' E05030'

..

₅₄ _30-56 _- _- _-

1 - - 1 2

27.6.80 N630 02' E050 21 '

..

₄₀ _32-64 _-

1 1 - 1 - 3 8

1.1.80 N6301S' E0603S' .. ₁₉

36-76 2 1 - - -

-

3 4

1. 7.80 N63012' E06054' .. ₃₃₈ _35-63

1 1 1 - 1

-

⁴ ¹

1. 7. 80 N63010' E06053'

..

₁₄₂ _31-65 ₁

1 - - - - 2 1

3.7.80 N620 46' E050 25' .. ₁₀₀ _32-S7 _-

2 -

- - -

² ²

3.7.80 N62053' EOS035'

..

₂₀₀

31-53 1 4 1 - - - 6 3

3.1.80 NS20 54' EOSO 34 '

..

₁₀₀ _30-53 ₁

1 - - - - 2 2 _,j:o.

- - -

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