- 期刊
- OpenAccess
Reproductive biology study of blackhead seabream (Acanthopagrus schlegelii) in Miaoli waters of Taiwan
摘要
Blackhead seabream Acanthopagrus schlegelii, the highest seedling release fish species and important commercial resources in everywhere in the coastal waters of Taiwan. Available reproductive biology studies for blackhead seabream were mostly in southern Taiwan Strait. There is no specific study done for the northern habitat in the Strait such as spawning season, sexual patterns, length at maturity, sex determination and reproductive cycle in relation to their conservation and management status. In this study, 454 samples were taken only from Miaoli waters of Taiwan from January 2017 until June 2018. All samples include 221 of males, 191 females and 42 hermaphrodites with total range females (16.8 - 45.8 cm), males (15.0 - 43.9 cm) and hermaphroditism (17 - 43.4 cm). The length-weight relationship showed a negative allometric growth for both males and females implies the fish becomes more slender as it becomes longer and is indicated by b value (b = 2.88 and 2.94; r = 0.98 and 0.98). Overall, the sex ratio of males to females was 1:1.16, with males predominant in the smaller size intervals and females in larger size. From the monthly changes of GSI, spawning is estimated to occur once a year from December to March, peaking from January to February. The observed fork lengths at 50% maturity were 25.0 cm for female and 24.3 cm for male. Histological analysis showed blackhead seabream is a protandric hermaphrodite, it was shown gonad functional as male for the first of life and begins to sexually change to female. Hermaphrodites found in this study were bisexual inactive where testicular tissue and ovarian tissue was separated by connective tissue in the bisexual gonad. According to the size and body growth pattern, we found that the blackhead seabream in Miaoli were smaller in immature size and get mature earlier.
延伸閱讀
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