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Maturation and Spawning of Robust Tonguefish (Cynoglossus robustus (Soleidae; Teleostei)
백근욱,김재원 한국수산과학회 2004 Fisheries and Aquatic Sciences Vol.7 No.3
We examined the ovaries of 312 robust tonguefish (Cynoglossus robustus) collected each month from January to December 2001, off the coast of Yeosu, Korea.The samples were used to investigate robust tonguefish reproductive activity. Monthly changes in the gonadosomatic indexindicated that spawning peaked between June and August. Fish size at first spawning was 15-19 cm total length (TL). Over 50% of female fish 25-29cm TL were sexually mature, and this rose to 100% for female fish 35-39 cm TL. The tonguefish spawned four or more times during the spawning season. Most females commenced spawning in their second year. The relationship between total length (cm TL) and fecundity (F) was F=528646Ln(TL)-1E+06.
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고리 주변해역에서 출현하는 꼬마달재(Lepidotrigla guentheri)의 식성
백근욱,허성회,최희찬,박주면 한국수산과학회 2011 한국수산과학회지 Vol.44 No.4
The feeding habits of the redbanded searobin Lepidotrigla guentheri were studied using 186 specimens collected from September to November, 2006, in the coastal waters off Gori, Korea. The sizes of L. guentheri ranged from 7.1 to 16.7 cm total length(TL). L. guentheri is a bottom-feeding carnivore that consumes mainly shrimp, especially Leptochela sydniensis, amphipods, and crabs. Its diet also includes small quantities of stomatopods, mysids, cumaceans, euphausiids, polychaetes, and copepods. Our feeding-strategy graphical method reveled that L. guentheri is a specialized feeder, with a narrow niche width. L. guentheri mainly consumed shrimp of all size classes and did not show significant ontogenetic changes in feeding habits. Smaller individuals(7-11 cm TL) secondly consumed amphipods, with the portion of amphipods in the total diet decreasing as body size increased. Prey size increased significantly as the fish grew in size.
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용서대 (Cynoglossus abbreviatus)의 연령과 성장
백근욱,허성회 한국수산과학회 2004 한국수산과학회지 Vol.37 No.1
Age and growth of three-lined tonguefish (Cynoglossus abbreviatus) were studied using samples from the waters off Yosu, Korea, from June to December, 2001. Sagittal otoliths had relatively clear annuli. Each annulus was formed once a year in April. The peak of the gonadosomatic index occurred also in April. The oldest fish observed in this study was 5 years old for females and 4 years old for males. The relationship between the otolith radius (R) and total length (L) was as follows: L=14.921R-2.5318 for females and L=13.527R- 0.5584 for males. The relationship between total length and body weight (W) was as follows: W=0.0008L3.54 for females and W=0.0029L for males. The growth in length of the fish was expressed by the von Bertalanffy's growth equation as: Lt=44.54(1-e-0.16(t+2.69)) for females and Lt=41.52(1-e-0.15(t+3.34)) for males.
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광양만에서 채집된 줄망둑 (Acentrogobius pflaumi)의 성숙과 산란
백근욱,허성회,김재원 한국수산과학회 2004 한국수산과학회지 Vol.37 No.3
Maturation and spawning of Acentrogobius pflaumi were studied using samples collected from the Gwangyang Bay, Korea, from January to December, 1999. The gonadosomatic index (GSI) of the female was the highest in May. The spawning season lasted from May to June. There was a significant difference in the 1 : 0.59 sex ratio between males and females (p<0.01). The percentage of sexually mature females was over 50% for the size group between 4.5 cm and 4.9 cm, and 100% for the size group over 5.5 cm in body length. The size of eggs spawned was between 0.4 to 0.6 mm, and the spawning occured once a year. Fecundity varied between 3,600 and 9,700 eggs. The relationship between the fecundity and body length of the fish was expressed in the fecundity equation as; F=0.294×103BL1.899. The first spawning length was 4cm BL.
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한국 순천만 갯벌지역 큰볏말뚝망둥어 (Periophthalmus magnuspinnatus)의 생식
백근욱,윤양호,Toru Takita,김지형,박세창,박찬일,김재원,신현출 한국수산과학회 2008 한국수산과학회지 Vol.41 No.4
Reproduction of the goby fish Periophthalmus magnupinnatus was examined using 298 specimens collected from April to October 2005 in a mud flat of Suncheon Bay, Korea. Specimens ranged in body length (BL) from 1.3 to 9.1 cm. Reproduction of the goby fish Periophthalmus magnuspinnatus was examined using 298 specimens collected from April to October 2005 in a mud flat of Suncheon Bay, Korea. Specimens ranged in body length (BL) from 1.3 to 9.1 cm. The gonadosomatic index (GSI) of females was highest in June and decreased until August. The hepatosomatic index (HSI) and fatness index of females were high in April and then decreased to nadirs in July. Spawning season lated from April to August and the ratio of females to males did not significantly differ (χ2-test, p>0.05). The first spawning length was 4.5cm BL, and the size of 50% maturity was estimated at 4.98cm BL. Fecundity (F) ranged from 1,316 to 4,768 eggs, and the relationship between F and BL was estimated as F=0.1562BL1.4068 (R2=0.59).
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