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http://dx.doi.org/10.5657/kfas.2006.39.4.349

Sexual Maturation and Spawning in the Sandfish Arctoscopus japonicus in the East Sea of Korea  

Lee, Hae-Won (Department of Marine Biology, Pukyong National University)
Kim, Jin-Hee (Institute of Fisheries Science, Pukyong National University)
Kang, Yong-Joo (Department of Marine Biology, Pukyong National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.39, no.4, 2006 , pp. 349-356 More about this Journal
Abstract
Gonad development in the sandfish Arctoscopus japonicus was investigated using a histological method. Specimens were collected monthly from April 2003 to March 2004, in the East Sea of Korea. The gonadosomatic index (GSI) of females began to increase in August, reached a maximum in November, and declined sharply in December. By contrast, in males, the GSI began to increase in June and reached a maximum in August. The annual reproductive cycle of A. japonicus can be divided into four successive stages in females: the early growing (January-March), late growing (April-August), ripe and spent (September-November), and recovery (December) stages. Males passed through early growing (January-April), late growing (May-July), ripe and spent (August-November), and recovery (November-December) stages. These results indicate that the spawning season was from October to December. The egg diameter of mature oocytes was 3.12$\pm$0.02 mm. The relationship between fecundity (F$_e$) and body length (BL) was F$_e$=0.4693BL$^{2.6825}$. Fecundity ranged from 483-2,254 eggs in a body length of 14.3-22.9 cm and increased with body length. The body length at 50% maturity was 14.80 cm, which corresponded to an age of 2.40 years.
Keywords
Arctoscopus japonicus; GSI; Fecundity; Gonadal development; Spawning;
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