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Reproductive Cycle of Dusky Tripletooth Goby Tridentiger obscurus in Jeju Island, Korea  

Jin, Young Seok (Marine and Environmental Research Institute, Cheju National University)
Park, Chang Beom (Marine and Environmental Research Institute, Cheju National University)
Kim, Han Jun (Marine and Environmental Research Institute, Cheju National University)
Lee, Chi Hoon (Marine and Environmental Research Institute, Cheju National University)
Song, Young Bo (Marine and Environmental Research Institute, Cheju National University)
Kim, Byung Ho (Jeju Hi-Tech Industry Development Institute)
Lee, Young Don (Marine and Environmental Research Institute, Cheju National University)
Publication Information
Korean Journal of Ichthyology / v.18, no.3, 2006 , pp. 184-192 More about this Journal
Abstract
To investigate reproductive cycle of Tridentiger obscurus in Jeju, total 408 fish were collected in brackish area (May 2004 to August 2005) and total 271 fish were collected in tidal pool (July 2004 to August 2005), respectively. Water temperature ranged $11.0{\sim}21.6^{\circ}C$ in brackish area. Water temperature of tidal pool ($11.1{\sim}24.5^{\circ}C$) in 2005 was similar to that of brackish area although it were highest $30.1{\sim}29.2^{\circ}C$ from July to August in 2004. In brackish area, female gonadosomatic index (GSI) increased in April and maintained high values from May to August. The reproductive cycle can be grouped into the following successive stages in the ovary: immature (November to May), maturing (March to September), ripe and spawning (May to September), and degenerating (July to December). In the tidal pool, female GSI rapidly increased in April and maintained high values until July in 2005. However, it has been low in July 2004 when water temperature was highest. The reproductive cycle can be grouped into the following successive stages in the ovary: immature (August to April), maturing (March to August), ripe and spawning (March to July), and degenerating (July to August 2004 and August 2005). Fecundity of mature female ranged from 1,214 to 12,109 in brackish and ranged from 2,427 to 13,892 in tidal pool area. The fecundity of fish in the tidal pool was significantly higher than that of fish in brackish area. Fecundity was correlated positively with total length and body weigh. Although the large group (> 111 mm total length) in brackish area observed only in spawning season, one in the tidal pool observed from October 2004 until next spawning season. Frequency of the large group was 0 to 12% and 11.4 to 57.9% in brackish area and tidal pool, respectively. These results were indicated that gonadal development of T. obscurus was affected to water temperature and day length.
Keywords
Tridentiger obscurus; reproductive cycle; gonadosomatic index (GSI); fecundity; brackish area; tidal pool;
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