Naslov
Reproductive cycle and length-weight relationship of Scomber japonicus, Houttuyn (1782), from the Middle Adriatic Sea

Autori
Čikeš Keč, Vanja ; Sinovčić, Gorenka ; Zorica, Barbara

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Integrative Zoology, Abstracts from XX International Congress of Zoology / - Pariz, 2008, 34-34

Skup
XX International Congress of Zoology

Mjesto i datum
Pariz, Francuska, 26.08.2008. - 29.08.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Reproduction; Length-weight relationship; Scomber japonicus; Adriatic Sea

Sažetak
The chub mackerel, Scomber japonicus Houttuyn (1782), is widely distributed in moderate and warm waters of Atlantic, Pacific and Indian Ocean. This middle-sized pelagic fish species also occurs thought the Mediterranean and Adriatic Sea. The chub mackerel specimens (n=790) were collected monthly from the commercial purse seine catches realized during January 1998 - November 1999, in the eastern Middle Adriatic Sea. In order to examine some reproductive traits of this comercialy importan fish species monthly evolution of gonadosomatic index, mass and stage of gonads were used. Overall, fork lengths of chub mackerel specimens varied from 20.1 to 38.0 cm and the mean value was 27.9 &#177; 3.1 cm. The proportion of males and females was almost equal (&#9794; /&#9792; =0.99) but the statistically significant differences from expected sex ratio 1:1 (&#967; 2 = 25.7270 ; P<0.001) was noticed in favoure of females. The period of reproductive activity was from April to September in the Middle Adriatic Sea coinciding with the highest values of gonadosomatic index and weights of gonads as well as with the most developed states of gonads. Length-weight relationship for chub mackerel specimens was: W = 0.0033 LF 3.3457(r2 = 0.8479), thus positive alometry was established.

Izvorni jezik
Engleski

Znanstvena područja
Biologija, Biotehnologija

POVEZANOST RADA