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Hormonal changes accompanying sexual maturation in captive milkfish (Chanos chanos Forsskal)

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Date
1992
Author
Marte, Clarissa L.
Lam, T. J.
Page views
4,037
ASFA keyword
fish culture ASFA
testosterone ASFA
hormones ASFA
reproductive cycle ASFA
seasonal variation ASFA
seasonality ASFA
sexual maturity ASFA
sexual reproduction ASFA
AGROVOC keyword
milkfish AGROVOC
Chanos chanos AGROVOC
Taxonomic term
Chanos chanos GBIF
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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.
URI
http://hdl.handle.net/10862/1388
Suggested Citation
Marte, C. L., & Lam, T. J. (1992). Hormonal changes accompanying sexual maturation in captive milkfish (Chanos chanos Forsskal). Fish Physiology and Biochemistry, 10(4), 267-275. https://doi.org/10.1007/BF00004475 
DOI
10.1007/BF00004475
Type
Article
ISSN
0920-1742
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  • Journal Articles [1196]

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