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Age Determination and Growth Pattern of Pacific Cod Gadus macrocephalus (Tilesius, 1810) in Jinhae Bay Korea  

Choi, Byung-Eon (College of Marine Science, The Institute of Marine Industry, Gyeongsang National University)
Gwak, Woo-Seok (College of Marine Science, The Institute of Marine Industry, Gyeongsang National University)
Publication Information
Korean Journal of Ichthyology / v.23, no.4, 2011 , pp. 269-277 More about this Journal
Abstract
Age and growth pattern of Pacific cod Gadus macrocephalus were determined using samples collected in Jinhae Bay in Korea during the spawning period from 2006 to 2009. The ages of 333 specimens were estimated using their otoliths. The reliability of scales as a means of age determination was analyzed by comparing the ages estimated from otoliths and scales of 96 specimens. The scales collected from the base of the second dorsal fin or from the caudal peduncle were proved to be suitable for age determination of Pacific cod. Monthly changes in the marginal index in otoliths decreased from December showing the lowest value in February. Ages ranged from 4 to 6 years for both females and males, and most of them were 6 years old. Relationships between the otolith radius (R) and total length (TL) were TL=10.4R+3.1 for males, and TL=11.5R+3.4 for females. The growth curves in total length ($L_t$, cm) were expressed as $L_t$=141.5 [1-exp{-0.089 (t+0.209)}] for males and $L_t$=127.5 [1-exp {-0.124 (t+0.077)}] for females.
Keywords
Pacific cod; Gadus macrocephalus; otolith; scale; age; growth;
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