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Spawning Time and Early Growth of Pacific Cod (Gadus macrocephalus) in Jinhae Bay, Korea  

Gwak, Woo-Seok (College of Marine Science, The Institute of Marine Industry, Gyeongsang National University)
Choi, Byung-Eon (College of Marine Science, The Institute of Marine Industry, Gyeongsang National University)
Lee, So-Gwang (Gyeongsangnam-do Fisheries Resources Research Institute)
Publication Information
Korean Journal of Ichthyology / v.24, no.2, 2012 , pp. 110-117 More about this Journal
Abstract
Hatching date and early growth of Pacific cod Gadus macrocephalus were estimated by examination of otolith microstructure of Pacific cod juveniles collected in Jinhae Bay of Korea from May to June, 2008. Water temperature during the main spawning time ranged from 7 to $9^{\circ}C$ according to the geographic distribution of temperature measured from November to May between 2006 and 2009. The spawners were collected from December to February between 2006 and 2008, and the gonadosomatic index of spawners was larger in females than in males, showing a peak in January. Total length of juveniles ranged from 37.5 to 94.9 mm ($63.2{\pm}11.0mm$; mean${\pm}$SD). The number of daily growth increments in juvenile otoliths were on average $102{\pm}15$ in May 17 samples, $119{\pm}16$ in May 29 ones and $116{\pm}18$ in June 3 ones. Hatching dates estimated from the number of daily growth increments ranged from late December to mid-March, showing the peak between late January and mid-February. Daily growth in total length (TL, mm) can be adjusted to the Gompertz curve: $TL_t=123.2{\exp}\{-{\exp}[-0.0165(t-81.8)]\}$ ($r^2$=0.93, n=273).
Keywords
Pacific cod; juvenile; otolith; growth in length; spawning period;
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