P er ce n ta g e d is tr ib u ti o n o f o to li th fi rs t

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Ödsmål, Kville sn, Bohuslän Hällristning

Fiskare från bronsåldern

Rock carving Bronze age fishermen

MEDDELANDE från

HAVS FISKE LABORATOR I ET LYSEKIL Report of the Herring Otolith Workshop held at Lysekil

18-19 September 1919 by

Rutger Rosenberg and R.J. Wood October 19T9

V

REPORT OF THE BEKRIEG OTOLITH WORKSHOP HELD ÂT LYSEKIL 18-19 SEPTEMBER 1979 An otolith workshop was held at Lysekil (Sweden) in accordance with the following recommendation of the Herring Assessment Working Group for the area south of 62°N (ICES C.M. 1979/H:6 PELAGIC FISH COMMITTEE).

The Working Group recommends that otolith samples he collected from both spawning and juvenile herring and a workshop set up at an early date and

convened by Dr. R. Rosenberg in Lysekil (Sweden) in order to determine the range of otolith types present in the indigenous stocks, to compare these with otoliths of the Korth Sea autumn spavners and to report to the 67th ^Statutory Meeting.

The following participated in the workshop

Lysekil, Sweden Stockholm, Sweden IJmuiden, Netherlands Bergen, Norway

Arendal, Norway

Charlottenlund, Denmark Lysekil, Sweden

Lysekil, Sweden

Charlottenlund, Denmark Lysekil, Sweden

Lysekil Sveten

\

A general discussion was held first of all ©n differences between the otoliths of spring and autumn spawning herring. Those considered were the appearance and size of the nucleus, the outline and shape of the whole otolith and the combined size of both the first growth and winter

zones. It was decided, in view of the short length of time available, that the most profitable approach would be to attempt to separate samp­

les of juvenile herring in Division Ilia into spring and autumn spawned fish on the basis of otolith differences in the size of the combined first growth and winter zones measured along the axis rostrum - post rostrum.

It was therefore necessary as a first step to examine the samples of otoliths which were available to the workshop from spawning herring of known origin. These consisted of spring spawners from:

The Kattegat: Randers Fjord (Denmark), Swedish coast and mid Kattegat.

The Skagerrak: Swedish, coast and Norwegian fjords.

The Baltic: Central Swedish coast.

Autumn spawners from:

The Kattegat: Kobbergrund

The Baltic: South coast of Sweden

The North Sea: Orkney - Shetland, Longstone and Whitby West of Scotland: Minch

Dan Andreasson Gunnar Aneer Ad Gerten Oddvar Dahl

Didrik Danielssen Bjarke Glcerfeldt-Tarp Olle Hagström

Britt-Maj .Karlsson Niels Lundgaard Marianne Martinsson Rutger Rosenberg Jim Wood

2

The participants, working in small groups, were able to reach general agreement that the autumn spawners tended to have larger first zones than spring spawners and there was also a satisfactory agreement bet- ween measurements made on the same otoliths by the different groups.

The results of the measurements made on the various samples of spaw­

ners are summarized in Table 1. It is clear that there is an increase in size across the table, northern Baltic spring spawners having the smallest and Orkney-Shetland autumn spawners the highest values. Tests of significance were carried out on mean sample values and the results are presented in Table 2. In most cases a significant difference was obtained between means and in only one of the comparisons be.tween spring and autumn spawning fish could such a difference not be de­

monstrated.

An examination ms then made of the otoliths which were available from juvenile herring caught in both the Skagerrak and Kattegat. The re­

sults are shown in Tables 3a and 3b. While the Kattegat samples seem to consist very predominantly of spring spawners, with a possible ad­

mixture of Baltic autumn spawners, those from the Skagerrak appear to include an autumn spawning component, particularly amongst the 1 ring fish, having a large first zone more characteristic of the Korth Sea herring.

On the basis of the results presented in this report it is recommended that measurements of otoliths should be continued in conjunction with counts of VS and K?, especially in the Skagerrak, as an additional aid in separation of herring stocks in that area. It is suggested that this type of examination could prove of value in many other areas.

This paper was presented at the 67th Statutory Meeting in Warszawa, Poland, in October 1979« Reference number C.M.1979/H:66»

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