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2 edition of Pheromones and ovarian growth in the African catfish "Clarias gariepinus" found in the catalog.

Pheromones and ovarian growth in the African catfish "Clarias gariepinus"

J. H. van Weerd

Pheromones and ovarian growth in the African catfish "Clarias gariepinus"

by J. H. van Weerd

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Published by Landbouwuniversiteit Wageningen in Wageningen .
Written in English


Edition Notes

Thesis (doctor in de landbouw) - Agricultural University, Wageningen, 1990.

StatementJ.H. van Weerd.
ID Numbers
Open LibraryOL21288783M

  Clarias gariepinus (Burchell, ) or African catfish is a species of catfish of the family Clariidae. It is one of the most highly valued species in Africa (Egypt, Ethiopia, Ghana, Mali and Nigeria) and Asia (China, Indonesia, Malaysia, Philippines and Thailand). Hilmi Fauji, Tatag Budiardi, Julie Ekasari, Growth performance and robustness of African Catfish Clarias gariepinus (Burchell) in biofloc‐based nursery production with different stocking densities, Aquaculture Research, /are, 49, 3, (), ().

African Catfish. The African catfish (Clarias gariepinus) is native to subtropical Africa but is now cultured across the planet. Males and females of this species spawn as pairs in flooded vegetation in turbid waters and appear to use pheromones to locate and identify each other. Male sex pheromone: Biology. Concurrently caught larger perch were used for growth studies. Backcalculations showed the influence of temperature on perch growth in Lake IJssel. Further, the LF-distributions of 2-group perch was strongly positively skewed, because this size of perch (11–18 cm) switches from feeding on zooplankton and macrofauna to feeding on fish (smelt).

INTRODUCTION. The African catfish, Clarias gariepinus (Burchell, ), is one of the most highly valued species in Africa (Egypt, Ethiopia, Ghana, Mali and Nigeria) and Asia (China, Indonesia, Malaysia, Philippines and Thailand). Recently, Clarias gariepinus has been introduced in some European and Latin American countries and its culture has increased in . Monoculture of the African catfish can be carried out when suitable feed, with a high protein content is available. Stocking rates. The results of Micha () clearly indicated that the growth of C. gariepinus decreases with increasing stocking density while fish standing crop remains more or less the same (Figure 19). Stocking rate therefore depends upon the desired .


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Pheromones and ovarian growth in the African catfish "Clarias gariepinus" by J. H. van Weerd Download PDF EPUB FB2

Title: Pheromones and ovarian growth in the African catfish Clarias gariepinus: Author: Weerd, van J.H. Degree grantor: Agricultural University: OpponentCited by: 6. In inus the presence of males enhances ovarian growth in pubertal females under hatchery conditions and in wild-caught adult females kept in ponds.

This phenomenon led to the assumption that sex pheromones are also involved in the early phases of the reproductive cycle of C. gariepinus, i.e. ovarian development and possibly also of the Cited by: 6. in ovarian growth stimulating holding water from adult african catfish clarias gariepinus 95 7.

plasma androgen levels in castrated adult male african catfish, clarias gariepinus, in relation to pheromonal stimulation of ovarian growth in pubertal conspecifics 8.

pheromones and ovarian growth in african catfish clarias gariepinus. a Cited by: 6. In teleost fish, pheromones play a role in a variety of social interactions.

Sex pheromones are involved in reproduction of several teleosts species, including the African catfish <em>Clarias gariepinus.</em> They regulate spawning behavior and endocrine events leading to : van J.H.

Weerd. Clarias gariepinus, also known as the African mud catfish, exists in the wild but it is also cultivated in ponds, cages, and pens and is of great commercial is an omnivorous fish with a preference for a planktonic diet.

It also feeds on other types of food items such as insects, insect larvae, pupae, fish, and fish remains. The chemical nature of sex attracting pheromones from the seminal vesicle of the African catfish, Clarias gariepinus.

Aquaculture, In attraction tests, ovulated female African catfish, Clarias gariepinus, were attracted by the administration of ml/1 seminal vesicle fluid to the aquarium water. 2. In the African catfish Clarias gariepinus, sex pheromones were recently demonstrated to also influence earlier phases of the gonadal cycle, i.e.

ovarian development in females. Aspects of interaction between sexes in emission of the pheromones, their source and identity are reviewed. An analysis of sex stimuli enhancing ovarian growth in pubertal African catfish, Clarias gariepinus.

Aquaculture, Ovarian growth in pubertal African catfish was followed during a day period. Different combinations of male sensory stimuli resulted in three distinct levels of ovarian development. The breeding biology and early development of the common southern African clariid catfish, Clarias gariepinus (Burchell), are described.

gariepinus reaches maturity towards the end of the second year ( mm TL, rarely towards the end of the first year, mm TL).

The modal size of breeding fishes is mm in females and mm in males. The growth performances of Clarias gariepinus in response to difference inclusion levels of Leucaena leucocephala meals are presented in the sections that follow: Growth performance Growth performance of the African catfish, Clarias gariepinus, fed varying quantities of feed containing Leucaena leucocephala leaf meal (LLM) over a Adult ♀ African catfish were made anosmic by thermal cauterisation of the olfactory epithelium, or were left intact.

Both groups of ♀♀ were induced to spawn by injection with pimozide and an LHRH analogue, and intact ♀♀ were then exposed to: (1) unlimited contact with ♂♂, (2) tactile contact with ♂♂, (3) olfactory contact with ♂♂, (4) olfactory contact with ♂♂ and.

J.H. Van Weerd's 3 research works with 55 citations and 48 reads, including: GCMS-identified steroids and steroid glucuronides in ovarian growth-stimulating holding water from adult African.

Pheromones and ovarian growth in the African catfish Clarias gariepinus. By J.H. Van Weerd. Topics: CLARIAS, FRESHWATER CATFISH, PHEROMONES, OVARIES. A health assessment on the sharptooth catfish, Clarias gariepinus, from four water bodies within this aquatic system was conducted during the peak low flow season of and Lambert J G D and Resink J W Steriod glucuronides as male pheromones in the reproduction of the African catfish,Clarias gariepinus;J.

Steriod. Biochem. Mol. Biol. 40 – CrossRef Google Scholar. J.G.D. Lambert's 79 research works with 2, citations and 1, reads, including: Metabolism of tibolone and its metabolites in uterine and vaginal tissue of rat and human origin.

This paper reviews recent advances in the culture of African catfish, including egg production, artificial spawning, the role of pheromones, induction of triploidy, nutrition, feeding and growth of larvae and fingerlings, and health control.

The economics of artisanal pond farming and the aquacultural potential of the species in intensive flow-through husbandry systems are discussed. Annex 2: SUCCESSFUL RECRUITMENT CONTROL OF NILE TILAPIA, OREOCHROMIS NILOTICUS BY THE AFRICAN CATFISH, CLARIAS GARIEPINUS (BURCHELL ) AND THE AFRICAN SNAKEHEAD, OPHIOCEPHALUS OBSCURIS.

A BIOLOGICAL ANALYSES. G.J. de GRAAF 1, 2, F. GALEMONI 3 and B. BANZOUSSI 3 UNDP/FAO Rural Fish Farming. The study was performed on C. gariepinus population inhabiting the river Nile main stream with emphasis on the stock assessment and population dynamics. The objectives of this study were to assess the growth rate, abundance and age composition, age at first sexual maturity, size and age at recruitment, size and age at first capture, mortality, exploitation level and yield per.

Furthermore, males of the African catfish Clarias gariepinus send waterborne chemical signals that not only stimulate ovarian development of females. 50EC) on the African catfish (Clarias gariepinus). Females fish were exposed to sub- lethal concentration of thiobencarb (½ LC 50, ppm) for 3, 9 and 15 days.Frequency on the Growth and Survival of African Catfish (Clarias Gariepinus) Fingerlings: Adv.

Environ. Biol., C(C): CC-CC, ABSTRACT An experiment was conducted to African catfish Clarias gariepinus fingerlings ( ± g) fed one of four feeding frequencies; once/day (1D), twice/day (2D), once every other day (1EOD) and twice every.INTRODUCTION.

African catfish Clarias gariepinus is a suitable alternative to tilapia in subsistence fish farming in Africa using low grade feed composed of some local agricultural and agro-industrial by-products, the yields of catfish from ponds could be as much as times higher than those of tilapia (Verreth et al., ).In addition, this species is known with its high growth .