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      The light intensity in growth, behavior and skin pigmentation of juvenile catfish Lophiosilurus alexandri (Steindachner)

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          Abstract

          ABSTRACT The survival of several fish species in captivity depends on their adaptation to the environmental conditions and the biological characteristics. The objective of the study was to evaluate the influence of different light intensity levels in growth, behavior and skin pigmentation in juvenile of Lophiosilurus alexandri. Fishes were exposed to the following luminosities: 0, 218, 278, and 459 lux. The experiment was conducted for 75 days, in a water recirculation system with controlled temperatures and aeration. Catfish juvenile were distributed in 35 L aquariums, at the density of 0.28 ind L-1. In order to evaluate fish growth, weight, standard- total length, weight gain, food consumption, food conversion, biomass, specific growth rate and survival were measured twice times a month. Also, swimming behavior, skin pigmentation and plasma cortisol levels were evaluated. Light influences L. alexandri feed consumption, food conversion, behavior and plasma cortisol levels. Environments with low light are recommended for the L. alexandri growth.

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          The regulation of motile activity in fish chromatophores.

          Chromatophores, including melanophores, xanthophores, erythrophores, leucophores and iridophores, are responsible for the revelation of integumentary coloration in fish. Recently, blue chromatophores, also called cyanophores, were added to the list of chromatophores. Many of them are also known to possess cellular motility, by which fish are able to change their integumentary hues and patterns, thus enabling them to execute remarkable or subtle chromatic adaptation to environmental hues and patterns, and to cope with various ethological encounters. Such physiological color changes are indeed crucial for them to survive, either by protecting themselves from predators or by increasing their chances of feeding. Sometimes, they are also useful in courtship and mutual communications among individuals of the same species, leading to an increased rate of species survival. Such strategies are realized by complex mechanisms existing in the endocrine and/or nervous systems. Current studies further indicate that some paracrine factors such as endothelins (ETs) are involved in these processes. In this review, the elaborate mechanisms regulating chromatophores in these lovely aquatic animals are described.
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            Does light have an influence on fish growth?

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              Growth and stress in fish production

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                lajar
                Latin american journal of aquatic research
                Lat. Am. J. Aquat. Res.
                Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar (Valparaíso, , Chile )
                0718-560X
                July 2019
                : 47
                : 3
                : 416-422
                Affiliations
                [2] Três Marias Minas Gerais orgnameHydrobiology and Fish Culture Station of Três Marias orgdiv1Development Company of the São Francisco and Parnaíba Brazil
                [3] Uberaba Minas Gerais orgnameUniversidade Federal do Triângulo Mineiro orgdiv1Department of Pathology, Genetics, and Evolution Brazil
                [1] Diamantina Minas Gerais orgnameUniversidade Federal dos Vales do Jequitinhonha e Mucuri orgdiv1Laboratory of Aquaculture and Aquatic Ecology Brazil
                Article
                S0718-560X2019000300416
                10.3856/vol47-issue3-fulltext-3
                ecd17026-9260-4f30-9d50-14184ef44f2f

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

                History
                : 15 December 2018
                : 07 August 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 37, Pages: 7
                Product

                SciELO Chile

                Categories
                Research Articles

                aquaculture,light incidence,fish activity,environment luminosity,bottomfish

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