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You are here: Home / Associated publications / Belgian Journal of Zoology / Bibliographic References / Marked interannual differences in reproductive parameters and daily egg production of anchovy in the northern Aegean Sea

S Somarakis (2005)

Marked interannual differences in reproductive parameters and daily egg production of anchovy in the northern Aegean Sea

BELGIAN JOURNAL OF ZOOLOGY, 135(2):247-252.

In the present paper, an overview of the application of the Daily Egg Production Method (DEPM) to the northern Aegean Sea anchovy stock is presented, and reproductive parameters are compared in the framework of ambient oceanographic regimes. The DEPM was applied twice : in June 1993 and June 1995. Data collection was based on bongo-net ichthyoplankton surveys and concurrent adult surveys onboard the commercial fishing fleet. Revised, more precise estimates of the daily egg production are presented based on the inclusion of both eggs and yolksac stages in the estimation procedure (fit of single embryonic mortality curves). Remarkable between-years differences in the daily egg production, batch fecundity and spawning frequency were found. These parameters were significantly higher in June 1993 than in June 1995. In June 1993, waters were colder, less saline and richer in zooplankton compared to 1995. Adult somatic condition and egg size were also higher in June 1993 than in 1995. These findings emphasize the importance of adult prey availability in determining anchovy egg production.

Engraulis encrasicolus; Aegean Sea; DEPM; reproduction
9th International Congress on the Zoogeography and Ecology of Greece and Adjacent Regions, Thessaloniki, GREECE, MAY 22-25, 2002
BJZ

ISSN 2295-0451 (online version)
ISSN 0777-6279 (printed version)
impact factor 2015: 0,87.

Editor-in-Chief:
Prof. Dr. Isa Schön
Royal Belgian Institute of Natural Sciences
Vautierstraat 29
1000 Brussels, Belgium

 



1863-1903
Annales de la Société malacologique de Belgique
 
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​Annales de la Société royale malacologique et zoologique de Belgique
 
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Annales de la Société Royale Zoologique de Belgique
 
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Belgian Journal of Zoology