engleski

Biological parameters of poor cod, Trisopterus minutus (Linnaeus, 1758) (Osteichthyes: Gadidae) from the eastern Adriatic Sea

Biological parameters of poor cod sampled in the eastern central Adriatic by commercial bottom-trawls were analyzed. Monthly random samples, ranging from 10.4 to 21.5 cm in total length (TL) were collected from January to December 2009 ; with a total of 1263 specimens (800 males and 463 females) measured. Otolith rings reading defined six age classes, ranging from 1 to 6 years, including a very high proportion of individuals 2 years old. The von Bertalanffy growth parameters were: males: L¥ = 26.81, K = 0.186, to = 1.41 ; females: L¥ = 29.5, K = 0.197, to = 1.33 ; sex combined: L¥ = 28.76, K = 0.194, and to = 1.34. The b values for males (2.97), females (3.01) and sex combined (2.99) showed that growth of poor cod was isometric. The GSI reached maximum values in February and minimum in September. The condition factor was lowest after spawning (May and July) and highest at the recovery phase (August). The fishing mortality (F = 0.65) and exploitation rate (E = 0.50), revealed a high fishing pressure on the stock in studied area. Decapods were the most important ingested preys in all seasons as well as in size from 12.2 to 22.1 cm TL.

Adriatic Sea; age; exploitation rate; growth; poor cod

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