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Bulletin of the Sea Fisheries Institute >
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| Title: | Recent observations of the sex ratio and maturity ogive of Baltic sprat in the north-eastern Baltic Sea. |
| Authors: | Kaljuste, Olavi
Raid, Tiit |
| ASFA Terms: | Sex
Sex ratio
Sexual maturity |
| Issue Date: | 2002 |
| Publisher: | Sea Fisheries Institute in Gdynia |
| Citation: | Bulletin of the Sea Fisheries Institute, Gdynia, 3. p. 47-54 |
| Abstract: | The sex ratio and maturity ogive of Baltic sprat were investigated in ICES Subdivisions
28, 29 and 32 for the 1980-1985 and 1995-2000 periods. The mean share of females
in sprat catches has been slightly above 50% in the north-eastern Baltic Sea for the last two
decades. The mean share of females in sprat catches increased in the Gulf of Finland but
decreased in ICES Sub-division 29 in the 1990s. It was revealed that approximately 90% of
sprat mature at the age of 2 and the fraction of mature fish at the age of 3 is about 95%. The
maturation of age group 1 shows high variability which ranges from 6 to 60% depending on
area and year. The maturity ogive indicated that sprat matured earlier in age groups in the
1990s as compared to the 1980s. The relatively higher winter air temperatures observed in the
1990s can be at least partly responsible for this phenomenon. |
| URI: | http://www.ceemar.org/dspace/handle/11099/351 |
| Related document: | http://www.mir.gdynia.pl/pliki/osrodek/biuletyn/biulet3-02.pdf |
| ISSN: | 1429-2335 |
| Appears in Collections: | Bulletin of the Sea Fisheries Institute
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