Age, growth and mortality of poor cod (Trisopterus minutus L.) from the eastern Adriatic Sea
Šantić, Mate (Faculty of Natural Science and Mathematics, Split (Croatia). Department of Biology) | Pallaoro, Armin (Institute of Oceanography and Fisheries, Split (Croatia)) | Mikulandra, Ivana (Elementary School Vodice, Vodice (Croatia)) | Rađa, Biljana (Faculty of Natural Science and Mathematics, Split (Croatia). Department of Biology) | Jardas, Ivan (Institute of Oceanography and Fisheries, Split, (Croatia))
The age, growth and mortality parameters for poor cod, Trisopterus minutus, from the eastern Adriatic were ana- lyzed. Samples were collected monthly from January to December 2009 on a random basis, with a total of 1200 specimens analyzed (885 females and 315 males). The values of parameter b (the exponent of the arithmetic form of length-weight relationships) of males (2.97), females (3.01) and total sample (2.99) indicated isometric growth. Fish aged 1-6 years were present in the samples, including a high proportion of 2-year-old individuals. The oldest female was estimated to be 6 years old, while the oldest male was 5. The von Bertalanffy growth parameters were L¥ = 26.81, K = 0.186, and to = 1.41 for males; L¥ = 29.5, K = 0.197, and to = 1.33 for females; L¥ = 28.76, K = 0.194, and to = 1.34 for all specimens. This study revealed that poor cod is a relatively slow-growing fish with intensive growth during the first two years of life. Total and natural mortal- ity were Z = 1.01 year–1 and M = 0.50 year–1 , respectively. The exploitation rate, E = 0.50, revealed a high fishing pressure on the stock in the studied area.
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