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Compensatory Hypertrophy Of The Remaining Ovary And The Effects Of Methallibure In The Unilaterally Ovariectomized Tilapia Aurea
(University of Nairobi, 1976)
In Tilapia aurea unilateral ovariectomy resulted in a compensatory hypertrophy of the remaining ovary. The compensatory hypertrophy is manifested by: (a) an increase in the number of dividing oogonia; and (b) hypertrophy ...
Endocrine regulation of reproduction in Tilapia
(University of Nairobi, 1972)
Tilapia, the dithiocarbamoylhydrazine derivative Methallibure (I. C. I. 33828), added as a suspension in 6 daily doses of 1 mg/liter of aquarium water each week, effectively suppresses gonadotrophin production after 5 ...
Histological studies on the testes of pond specimens of Tilapia nigra (Gunther) (Pisces: Cichlidae) and their implications of the pituitary-testis relationship
(University of Nairobi, 1970)
T. nigra pond specimens were studied histologically and histochemically to investigate the relative development of the spermatogenetic and the interstitial tissue elements. The earliest phases showed active spermatogenesis ...
Gonadal Development And Reproductive Activity Of The Cichlid Fish Tilapia Leucosticta (trewavas) In An Equatorial Lake
(University of Nairobi, 1969)
THE most important external factors that influence gonadal development and reproductive activity are day length and temperature1. In temperate zones both factors show dramatic changes in the annual cycle. In the tropics, ...
Histological Studies On The Testis Of Tilapia Leucosticta And Other Species Of The Genus Tilapia (pisces: Teleoste)1
(University of Nairobi, 1969-04)
ABSTRACT: Histological studies carried out on specimens of the cichlid fishes T.
leucosticta, T. nigra, and T. zillii collected in the East African Rift Valley crater lake,
Lake Naivasha reveal that various
stages of ...
Failure of mammalian TRH to stimulate thyroid function in the
(University of Nairobi, 1973)
Synthetic TRH in doses as high as 100 μg per 50 g (average) lungfish produced no change in radioiodine metabolism in the thyroid gland. In similar animals 1.0 IU of bovine TSH clearly was stimulatory.
Gonadal and reproductive patterns in Tilapia leucosticta (Teleostei: Cichlidae) in an equatorial lake, Lake Naivasha (Kenya)
(University of Nairobi, 2009-08)
The cichlid fish T. leucosticta (Trewavas) was studied by fortnightly seining an area of an equatorial lake (Lake Naivasha) in Kenya to study their reproductive and gonadal patterns. The study lasted 16 months during which ...
The effect of temperature and gonadotropin on testicular steroidogenesis in Sarotherodon (tilapia) mossambicus in vitro
(University of Nairobi, 1983-04)
Testes of sexually mature Sarotherodon mossambicus were incubated at 15, 22, 30, and 40° with (a) tritiated testosterone and (b) salmon pituitary extract. Formation of 11-keto- and 11β-hydroxytestosterone from the tritiated ...
Methallibure studies on Tilapia: II. Effect of tilapia pituitary homogenate (TPH), human chorionic gonadotropin (HCG) and testosterone propionate (TP) on the testes of Methallibure-treated Tilapia nigra
(University of Nairobi, 1974-07)
In Methallibure-suppressed T. nigra testes high and low doses of TPH and HCG stimulate a qualitatively similar reactivation of spermatogenesis resulting in a significant elevation of testicular weight and G.S.I.; interstitial ...
Effect of chorionic gonadotrophin on testicular histology and testosterone production in Tilapia leucosticta (Teleostei: Cichlidae
(University of Nairobi, 1970-10)
Eight adult male T. leucosticta were given daily injections of 500 IU human chorionic gonadotrophin (Pregnyl, Organon) intraperitoneally for 1 week. These fish showed marked increases in testicular size, gonosomatic index, ...