engleski

Co-variation of gonadosomatic index, condition factor and length-weight relationships of poor cod, Trisopterus minutus (Osteichthyes: Gadidae), in the Eastern Adriatic Sea

Monthly changes in length-weight relationships (LWRs), gonadosomatic index (GSI) and condition factor in the poor cod Trisopterus minutus (Linnaeus, 1858) were studied. A total of 1263 specimens (463 males and 800 females) ranging from 8.9 to 25.5 cm in total length (TL) were collected in the eastern Adriatic Sea. Samples were taken at monthly intervals (January-December 2007) using bottom-trawls. In total sample, the b values of length-weight relationships showed that growth of both males and females was isometric. Allometric parameters of b values varied during the year ; positive allometric growth was noted in winter (February and March), while summer (July and August) negative allometric growth was observed. The GSI reached maximum values in February and minimum in September. The condition factor was lowest immediately after spawning (May and July) and highest at the recovery phase (August). Seasonal variation of LWRs and condition factor of poor cod were connected with the gonad change as well as feeding activity and energy distribution. During the summer-autumn season, food energy is spent in somatic growth, while in winter it is converted in gonad development.

Gadidae - Trisopterus minutus - MED - Adriatic Sea - Length-weight relationship - Gonadosomatic index.

nije evidentirano