Effects of different levels of sensory contact upon reproductive activity of adult male and female Sarotherodon (Tilapia) mossambicus (Peters); Pisces: Cichlidae

Silverman, Harold I.

doi:10.1016/0003-3472(78)90097-0

Cited by 34 publications

(9 citation statements)

References 24 publications

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“…This may occur when some structural components are absent in the environment, as reported for other cichlids (6,26).…”

Section: Discussionmentioning

confidence: 75%

“…In Oreochromis genera, male-female contact occurs close to the final oocyte maturation period (6), and in other cichlids spawning occurs a few hours after ovulation (to Tilapia macrocephala) (37). Thus, visual contact with males can be one of the factors triggering ovulation followed by spawning in Nile tilapia, probably by hormonal stimulation (e.g., 33).…”

Section: Discussionmentioning

confidence: 99%

“…In Oncorhynchus species, for example, visual and mechanical cues from females induce spermiation in males (3). The sound produced by some species facilitates intraspecific recognition and accelerates spawning (4,5), whereas sighting a male increases ovulation frequency in female Oreochromis mossambicus Visually stimulated reproduction in fish www.bjournal.com.br (6), Trichogaster trichopterus (7), and Danio rerio (8).…”

Section: Introductionmentioning

confidence: 99%

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Visual communication stimulates reproduction in Nile tilapia, Oreochromis niloticus (L.)

Castro

Gonçalves-de-Freitas

Volpato

et al. 2009

Braz J Med Biol Res

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Reproductive fish behavior is affected by male-female interactions that stimulate physiological responses such as hormonal release and gonad development. During male-female interactions, visual and chemical communication can modulate fish reproduction. The aim of the present study was to test the effect of visual and chemical male-female interaction on the gonad development and reproductive behavior of the cichlid fish Nile tilapia, Oreochromis niloticus (L.). Fifty-six pairs were studied after being maintained for 5 days under one of the four conditions (N = 14 for each condition): 1) visual contact (V); 2) chemical contact (Ch); 3) chemical and visual contact (Ch+V); 4) no sensory contact (Iso) -males and females isolated. We compared the reproductive behavior (nesting, courtship and spawning) and gonadosomatic index (GSI) of pairs of fish under all four conditions. Visual communication enhanced the frequency of courtship in males (mean ± SEM; V: 24.79 ± 3.30, Ch+V: 20.74 ± 3.09, Ch: 0.1 ± 0.07, Iso: 4.68 ± 1.26 events/30 min; P < 0.05, two-way ANOVA with LSD post hoc test), induced spawning in females (3 spawning in V and also 3 in Ch+V condition), and increased GSI in males (mean ± SEM; V: 1.39 ± 0.08, Ch+V: 1.21 ± 0.08, Ch: 1.04 ± 0.07, Iso: 0.82 ± 0.07%; P < 0.05, two-way ANOVA with LSD post hoc test). Chemical communication did not affect the reproductive behavior of pairs nor did it enhance the effects of visual contact. Therefore, male-female visual communication is an effective cue, which stimulates reproduction among pairs of Nile tilapia.

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“…This may occur when some structural components are absent in the environment, as reported for other cichlids (6,26).…”

Section: Discussionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Visual communication stimulates reproduction in Nile tilapia, Oreochromis niloticus (L.)

Castro

Gonçalves-de-Freitas

Volpato

et al. 2009

Braz J Med Biol Res

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“…They play a role in the control of sex differentiation in some hermaphroditic species, particularly in serranids, even in farmed species such as groupers [28,62]. In the tilapia Oreochromis mossambicus, they advance the age at first spawning [63] or modulate the duration of the inter spawning interval [64]. But, most of all, social interactions are very important to synchronise maturation and release of gametes from both sexes during spawning.…”

Section: Importance Of Environmental Factorsmentioning

confidence: 99%

Particularities of reproduction and oogenesis in teleost fish compared to mammals

2005

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-Compared to mammals, teleost reproduction presents many original features. Reproductive strategies of species are diversified into numerous adaptations to a large variety of aquatic environments. This diversity may concern sexuality, spawning and parental behaviour, sensitivity to environmental factors, and specific features of gametogenesis such as the duration of vitellogenesis, and egg morphology. Sexuality presents a variety of natural modalities, from gonochorism to hermaphrodism. The absence of definitive arrest of body growth in the adult of most species gives a particular interest to the practical control of growth-reproduction interactions. Vitellogenesis, which represents an important metabolic effort for the maternal organism, involves the synthesis of vitellogenin, a specific glycolipo-phosphoprotein produced in the liver under estradiol stimulation, and its incorporation into oocytes by a receptor mediated process. Both estradiol synthesis in follicle cells and vtg uptake by vitellogenic follicles appear to be mainly controlled by FSH. Oocyte maturation is directly triggered by a progestin, or MIS (maturation inducing steroid) synthesised in follicle cells mainly under LH control, and acting through the non-genomic activation of a membrane receptor. Practical applications of some of these particularities result mainly from the external character of the fertilisation process and of embryonic development, which allows manipulating respectively egg chromosome stocks and sex differentiation. Moreover, the sensitivity of sex differentiation to exogenous factors favours the development of practical methods to control the sex of farmed populations. Finally, the sensitivity of reproductive mechanisms to xenobiotics has led to various kinds of bioassays for putative pollutants.reproductive strategies / sexuality / spawning / vitellogenesis / oocyte maturation / fertilisation

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“…In cichlid fishes (e.g. Oreochromis mossambicus) males are sensitive to the maturation stage of females, courting more intensively ovulated females (Silverman, 1978) This effect also seems to be mediated by chemical signals emitted by receptive females (Falter and Dolisy, 1989). Male cichlids also experience a rise in 11-ketotestosterone (KT) in response to courtship interactions (Borges et al, 1998).…”

mentioning

confidence: 99%

Social modulation of androgen levels in male teleost fish

Oliveira

Hirschenhauser

Carneiro

et al. 2002

Comparative Biochemistry and Physiology Part B: Biochemistry an

193

113

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Androgens are classically thought of as the sex steroids controlling male reproduction. However, in recent years evidence has accumulated showing that androgens can also be affected by the interactions between conspecifics, suggesting reciprocal interactions between androgens and behaviour. These results have been interpreted as an adaptation for individuals to adjust their agonistic motivation and to cope with changes in their social environment. Thus, malemale interactions would stimulate the production of androgens, and the levels of androgens would be a function of the stability of its social environment w'challenge hypothesis', Gen. Comp. Endocrinol. 56 (1984) 417x. Here the available data on social modulation of androgen levels in male teleosts are reviewed and some predictions of the challenge hypothesis are addressed using teleosts as a study model. We investigate the causal link between social status, territoriality and elevated androgen levels and the available evidence suggests that the social environment indeed modulates the endocrine axis of teleosts. The association between higher androgen levels and social rank emerges mainly in periods of social instability. As reported in the avian literature, in teleosts the trade-off between androgens and parental care is indicated by the fact that during the parental phase breeding males decreased their androgen levels. A comparison of androgen responsiveness between teleost species with different mating and parenting systems also reveals that parenting explains the variation observed in androgen responsiveness to a higher degree than the mating strategy. Finally, the adaptive value of social modulation of androgens and some of its evolutionary consequences are discussed. ᮊ

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Effects of different levels of sensory contact upon reproductive activity of adult male and female Sarotherodon (Tilapia) mossambicus (Peters); Pisces: Cichlidae

Cited by 34 publications

References 24 publications

Visual communication stimulates reproduction in Nile tilapia, Oreochromis niloticus (L.)

Visual communication stimulates reproduction in Nile tilapia, Oreochromis niloticus (L.)

Particularities of reproduction and oogenesis in teleost fish compared to mammals

Social modulation of androgen levels in male teleost fish

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