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Circannual and circadian variations in plasma levels of steroids (cortisol, estradiol-17 beta, estrone, and testosterone) correlated with the annual gonadal cycle in the catfish, Heteropneustes…
- V. Lamba, S. V. Goswami, B. I. Sundararaj
- Biology, Medicine
- General and comparative endocrinology
- 1 May 1983
Circannual and circadian variations in plasma levels of steroids were estimated by radioimmunoassay in the female and male catfish over two consecutive annual reproductive cycles to show rather precise correlations with environmental factors such as photoperiod, temperature, and rainfall as well as with seasonal reproductive activity in both sexes of catfish. Expand
Reproductive physiology of teleost fishes : a review of present knowledge and needs for future research
In vitro maturation and ovulation of oocytes of the catfish, Heteropneustes fossilis (Bloch): effects of mammalian hypophyseal hormones, catfish pituitary homogenate, steroid precursors and…
Results strongly suggest that inasmuch as LH and catfish pituitary homogenate per se do not induce oocyte maturation in vitro, the terminal hormones which act directly on the oocytes to induce maturation and ovulation are the corticosteroids principally, DOC and F. Expand
Circadian meal timing in relation to lighting schedule optimizes catfish body weight gain.
Body weight gain in the presumably dark-active catfish seems to be maximal when food is made available in the middle or later part of the daily dark span, by mechanisms yet to be elucidated. Expand
Seasonal reproductive activity in the testes and seminal vesicles of the catfish, Heteropneustes fossilis (Bloch)
Tests exhibit initiation of spermatogenesis in the mid‐preparatory period, but significant increase in weight of the testes accompanied by active sperMatogenesis occurs during the prespawning period, while seminal vesicles show initiation of secretory activity during the preparatory period. Expand
Thermal tolerance and preference of the Indian catfish Heteropneustes fossilis
The catfish Heteropneustes fossilis tolerates a wide range of temperatures and avoids temperatures below 25° C regardless of seasonal acclimatization, and the minimal and maximal lethal temperature values obtained during summer and winter are higher than those obtained during winter. Expand
Effects of melatonin and prolactin treatment on the hypophysial-ovarian system in the catfish, Heteropneustes fossilis (Bloch)☆
Evidence is presented to show that the inhibition exerted by melatonin or prolactin is tentative and that this inhibitory influence is abolished following withdrawal of treatment. Expand
Hormonal Regulation of in vivo and in vitro oocyte maturation in the catfish, Heteropneustes fossils (Bloch).
In the catfish, gonadotropin seems to stimulate the interrenal to produce corticosteroids which in turn act on the oocytes to induce maturation, and the mechanism of steroid-induced maturation has been investigated. Expand
Effects of piscine and mammalian gonadotropins on gametogenesis in the catfish, Heteropneustes fossilis (bloch)
Abstract Salmon (SG-G100) and mammalian (ovine FSH and LH) gonadotropins were tested for their gonadotropic activity in the hypophysectomized catfish, Heteropmeustes fossilis , by evaluating… Expand
Temporal effects of ovine luteinizing hormone and desoxycorticosterone acetate on maturation and ovulation of oocytes of the catfish, Heteropneustes fossilis (Bloch): an in vivo and in vitro study.
It is tentatively concluded that the terminal hormones which act on the catfish oocytes to induce maturation and ovulation are the corticosteroids. Expand