Some aspects of induced spawning in the catfish Heteropneustes
β Scribed by L. S. Ramaswami; B. I. Sundararaj
- Publisher
- Springer
- Year
- 1957
- Tongue
- English
- Weight
- 204 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0028-1042
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The catfish, H. fossilis, survives for long periods after hypophysectomy, although with impaired osmoregulatory mechanisms. Plasma osmolarity and cortisol levels decline significantly within 2 hr after hypophysectomy and attain the lowest values by about 27 hr. Hypophysectomy also results in a marke
Experiments were conducted to evaluate the effects of mammalian hypophysial hormones, placental gonadotrophins, gonadal hormones, and adrenal corticosteroids on ovulation and spawning in three-day hypophysectomized gravid catfish. Of the hypophysial hormones tested (FSH, LH, LtH, STH, TSH, ACTH, and
Chlorpyrifos treatment t o Heteropneustes fossilis produced hypertrophy of nuclei and occurrence of exhausted cells in the liver a t 48 h. After 72 h of treatment, vacuolar degeneration is observed. Following 96 h of exposure, rupture of cell walls and vacuolization were noticed.
## Abstract Actinomycin D and mitomycin C, inhibitors of DNAβdependent RNA synthesis, were ineffective in blocking desoxycorticosterone (DOC)βinduced in vitro maturation in oocytes of the catfish, __Heteropneustes fossilis__ (Bloch). This suggests that a concurrent mRNA synthesis is not obligatory