Please use this identifier to cite or link to this item: https://doi.org/10.1007/BF00004475
Title: Hormonal changes accompanying sexual maturation in captive milkfish (Chanos chanos Forsskal)
Authors: Marte, C.L.
Lam, T.J. 
Keywords: estradiol
milkfish
reproduction
seasonal cycle
testosterone
Issue Date: Dec-1992
Citation: Marte, C.L., Lam, T.J. (1992-12). Hormonal changes accompanying sexual maturation in captive milkfish (Chanos chanos Forsskal). Fish Physiology and Biochemistry 10 (4) : 267-275. ScholarBank@NUS Repository. https://doi.org/10.1007/BF00004475
Abstract: Steroid hormone profiles accompanying sexual maturation in captive milkfish are described. There were no significant differences in levels of serum estradiol 17-β (E2) and testosterone (T) between immature male and female fish. Mean E2 levels rose from 0.54±0.11 ng/ml in immature females (Stage 1) to 4.53±1.16 ng/ml in vitellogenic females (Stage 5), while T levels increased from 2.06±0.28 ng/ml to 38.4±9.26 ng/ml. E2 and T levels were positively correlated to GSI and oocyte diameter. In males, serum T levels increased from 2.5±0.40 ng/ml in immature males to 27.73±5.02 ng/ml in spermiating males. A significantly higher T level was found in males with thick and scantly milt (spermiation index, SPI, 2) compared to males with scanty milt (SPI, 1) or males with copious, fluid milt (SPI, 3). Serum levels of E2 and T, and the GSI in females rose significantly during the breeding season (April-June 1983). The levels of both steroids dropped below 1 ng/ml in spent females sampled in succeeding months. In immature males, T levels ranged from 1.11 ng/ml to 2.78 ng/ml and rose significantly to 21.52±8.38 ng/ml during the breeding season when GSI peaked. Serum T levels dropped to around 10 ng/ml in the succeeding months when only spent or regressed males were sampled. © 1992 Kugler Publications.
Source Title: Fish Physiology and Biochemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/106823
ISSN: 09201742
DOI: 10.1007/BF00004475
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