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Serum Steroid Hormone Level and Hematological Characteristics of One-year Cultured eels, Anguilla japonica Based on Total Length and Sex  

전민지 (부경대학교 사료영양연구소)
한경민 (부경대학교 사료영양연구소)
배준영 (부경대학교 사료영양연구소)
유진형 (부경대학교 사료영양연구소)
이계안 (부경대학교 사료영양연구소)
배승철 (부경대학교 사료영양연구소)
Publication Information
Journal of Aquaculture / v.16, no.4, 2003 , pp. 267-272 More about this Journal
Abstract
This study investigated sex determination through serum steroid hormone level and compared hematological characteristics of one-year old cultured eels, Anguilla japonica. Four different groups were divided with total length at 40∼45, 45∼50, 50∼55, and 55∼60 cm. Males dominated eels of 40∼50 cm in total length group, while females dominated eels of more than 50 cm. All females and males were immature. Hematocrit levels of males (total length: 40∼50 cm) were higher than those of females (total length: 50∼60 cm). Hemoglobin content also differed between males and females. Glutamate oxaloacetate transaminase (GOT) levels of 40∼45 cm males tended to be higher (157$\pm$3.46 IU/L) than that of other sized males, but there were no significant differences between groups (P<0.05). The highest GOT levels were found in of 55∼60 cm females (148$\pm$3.46 IU/L) compared with that of other female groups (P<0.05). Glutamate pyruvate transaminase (GPT) levels of males and females in the 55∼60 cm size range was significantly higher thanothers (P<0.05). The result of this study indicated steroid hormone content of males and females were very low, but testosterone (T) and estradiol-17$\beta$, (E2) contents of females were higher than those of males. For further research of sex determination in cultured eels, it needs to investigate in more defined body length.
Keywords
Eel; Estradiol-17${\beta}$; Hematological aspects; Sex ratio; Testosterone;
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[ 廣瀨 慶二 ] / うなぎを增やす