붉은쏨뱅이(Sebastiscus tertius)의 생식 주기

Abstract

The aim of the present study was to analyze the reductive cycle of the red marbled rockfish Sebastiscus tertius. The analysis was based on annual changes in the gonadosomatic index (GSI), the hepatosomatic index (HSI), histology of the gonadal structure, and plasma sex steroid hormone levels of adult fish from April 1997 to April 1998. GSI of females began to increase in February and peaked (<TEX>$10.8{\pm}2.72$</TEX>) in May. HIS levels (<TEX>$3.41{\pm}0.49$</TEX>) peaked in February and elevated plasma steroid hormones (<TEX>$1.47{\pm}0.75$</TEX> ng/mL for estradiol-<TEX>$17{\beta}$</TEX> (<TEX>$E_2$</TEX>) and <TEX>$230.7{\pm}27.6$</TEX> pg/mL for testosterone (T)) were observed in April. However, in male fish, GSI levels started to increase in August and remained high until November (<TEX>$0.21{\pm}0.05$</TEX>). T levels were was also elevated in August and peaked in October (<TEX>$188.1{\pm}43.5$</TEX> pg/mL) and November (<TEX>$186.8{\pm}28.0$</TEX> pg/mL), but started to decline 1 month than the GSI. These results suggest that female ovoviviparious periods span from April to June and amle mating periods occur from November to February.