title: Yolk-sac larval development of the substrate-brooding cichlid Archocentrus nigrofasciatus in relation to temperature.
abstract: In order to conserve and culture the cichlid fish Archocentrus nigrofasciatus, more information about its reproductive biology and its larval behavior and morphogenesis is necessary. Currently, temperatures ranging from 21 to 27 °C are used in ornamental aquaculture hatcheries. Lower temperatures are preferred to reduce the costs of water heating, and 23 °C is usually the selected temperature. However, there is limited information on culturing protocols for ornamental species and most of the information generated on this topic remains scarce. Thus, the present study examines the morphological development of Archocentrus nigrofasciatus during the yolk-sac period up to the age of 100 h post-hatching in relation to 2 temperature regimes used in ornamental aquaculture: a temperature of 27 °C (thermal optimum) and a decreased temperature of 23 °C (thermal tolerance). The results of this study suggest that the 27 °C temperature generates intense morphological changes in yolk-sac development in a shorter period. This has advantages as it reduces the time of yolk-sac larval development, and, thus, minimizes the transition phase to exogenous feeding and maximizes the efficiency at which yolk is converted into body tissues. The present paper provides necessary information to produce freshwater ornamental fish with better practices so as to increase larval survival and capitalize on time for growth.
authors.affiliation: Department of Aquaculture and Fisheries, Technological Educational Institution of Western Greece, Mesollonghi, Greece.|Department of Ichthyology and Aquatic Environment, School of Agricultural Sciences, University of Thessaly, Volos, Greece.
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Vlahos
authors.affiliation: Department of Aquaculture and Fisheries, Technological Educational Institution of Western Greece, Mesollonghi, Greece.
authors.forename: Michael
authors.initials: M
authors.lastname: Vasilopoulos
authors.affiliation: Department of Ichthyology and Aquatic Environment, School of Agricultural Sciences, University of Thessaly, Volos, Greece.
authors.forename: Eleni
authors.initials: E
authors.lastname: Mente
authors.affiliation: Department of Aquaculture and Fisheries, Technological Educational Institution of Western Greece, Mesollonghi, Greece.
authors.forename: George
authors.initials: G
authors.lastname: Hotos
authors.affiliation: Department of Aquaculture and Fisheries, Technological Educational Institution of Western Greece, Mesollonghi, Greece.
authors.forename: George
authors.initials: G
authors.lastname: Katselis
authors.affiliation: Department of Aquaculture and Fisheries, Technological Educational Institution of Western Greece, Mesollonghi, Greece.
authors.forename: Kosmas
authors.initials: K
authors.lastname: Vidalis
mesh_terms: D000818:Animals; D017756:Aquaculture; D023681:Cichlids / Q000196:embryology* / Q000254:growth & development*; D004625:Embryo, Nonmammalian / Q000502:physiology; D007814:Larva / Q000254:growth & development; D009024:Morphogenesis; D013696:Temperature
keywords: Archocentrus nigrofasciatus; convict cichlid; growth yolk-sac development; temperature