Reproductive biology of freshwater fishes from the Venezuelan floodplains.

Fish Physiology and Biochemistry
H Y GuerreroD Marcano

Abstract

This review describes the endocrine changes that occur during the annual reproductive cycle of Pygocentrus cariba, Pimelodus blochii, and Oxydoras sifontesi and their relationships with the environmental characteristics of Venezuelan floodplains. Most reproductive studies of teleosts have focused on changes that occur during annual cycles in temperate species but, in tropical fish, this has been examined less frequently. P. cariba, P. blochii, and O. sifontesi are seasonal breeders widely distributed along the Orinoco River. Under natural conditions they have an annual gonadal cycle closely related to changes in the annual hydrology cycle of the Orinoco River which defines two seasons on the floodplain: inundation and isolation. The reproductive cycle of these species seems to be controlled by cues from the external environment. Relevant data about gonadal maturation, for example gonadosomatic index and sexual hormones secretion, are contrasted. The role of catecholamines in neuroendocrine control of the reproductive axis is also considered in this work.

References

Jun 1, 1990·General and Comparative Endocrinology·F PratA Fostier
Feb 1, 1987·General and Comparative Endocrinology·S Singh, T P Singh
Dec 22, 1985·The Journal of Comparative Neurology·J N FryerR P Kirby
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Jul 1, 1993·Fish Physiology and Biochemistry·O KahD de Monbrison
May 1, 1987·Fish Physiology and Biochemistry·J G Eales, S Shostak

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Citations

Mar 27, 2019·Conservation Biology : the Journal of the Society for Conservation Biology·Karl A LamotheD Andrew R Drake
Feb 10, 2017·Journal of Fish Biology·V A OliveiraL F A Montag
Oct 13, 2020·Parasitology Research·Pedro Hercílio de Oliveira CavalcanteCláudia Portes Santos

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