Induced reproduction and early development histology of Oscar Astronotus ocellatus (Agassiz, 1831)

Oscar (Astronotus ocellatus) is an important fish from the Amazon Basin that has great potential for fish farming, human consumption, sport fishing and fish keeping. This study aimed to evaluate the effect of two hormonal treatments on the induction of artificial reproduction in broodstock and to de...

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Autores:
Do Carmo Faria Paes M.
Makino L.C.
Avendaño Vasquez, Leonardo
Fernandes J.B.K.
Valentin F.N.
Nakaghi L.S.O.
Tipo de recurso:
Article of journal
Fecha de publicación:
2015
Institución:
Universidad Cooperativa de Colombia
Repositorio:
Repositorio UCC
Idioma:
OAI Identifier:
oai:repository.ucc.edu.co:20.500.12494/41654
Acceso en línea:
https://doi.org/10.12804/revsalud13.01.2015.01
https://hdl.handle.net/20.500.12494/41654
Palabra clave:
Astronotus ocellatus
Cichlidae
Cyprinidae
chorionic gonadotropin
tissue extract
animal
aquaculture
carp
chemistry
cichlid
cytology
drug effects
embryology
female
growth
development and aging
hypophysis
larva
male
nonmammalian embryo
oocyte
physiology
procedures
reproduction
Animals
Aquaculture
Carps
Chorionic Gonadotropin
Cichlids
Embryo
Nonmammalian
Female
Larva
Male
Oocytes
Pituitary Gland
Reproduction
Tissue Extracts
Rights
closedAccess
License
http://purl.org/coar/access_right/c_14cb
Description
Summary:Oscar (Astronotus ocellatus) is an important fish from the Amazon Basin that has great potential for fish farming, human consumption, sport fishing and fish keeping. This study aimed to evaluate the effect of two hormonal treatments on the induction of artificial reproduction in broodstock and to describe the histological development of embryos and larvae. Broodstocks were selected and induced using two different hormones: (i) extract of carp pituitary (ECP); and (ii) synthetic human chorionic gonadotropin (hCG). Spawnings were transferred to hatcheries, collected at pre-established times, processed and analysed by histology. Astronotus ocellatus did not respond well to induced reproduction. From 16 couples of breeding fish, only five out of the eight females released oocytes after the hormonal action time, three with hCG and two with ECP; just one male responded positively to hCG. Oscar eggs were oval, and semi-adhesive, the yolk contained granules, and egg diameter was approximately 1.65 ± 0.057 to 1.98 ± 0.038 mm. Development from the initial collection (IC) point until the total absorption of the yolk lasted 315 h, at an average temperature of 27.45 ± 2.13°C. Several events marked embryonic and larval development, including the formation of the optic cup, forebrain, otic vesicle and cephalic divisions. The newly hatched larvae had non-pigmented eyes, and a closed mouth and anus, as well as the presence of adhesive glands on the head. Larval development was characterized by formation of the heart, liver, gaseous bladder, gills, pronephros, brain, fins and also the digestive tract. These results provide important information for the rearing and reproduction of A. ocellatus. Copyright © Cambridge University Press 2013.