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Now showing items 41-49 of 49
Variación mensual del índice de gonadosomatico de Colossoma macropomum relacionado a factores ambientales en Cañas, Costa Rica
(Universidad Nacional (Costa Rica), 2000)
Con el fin de determinar la variación mensual en el índice gonadosomático de Colossoma macropomum en estanques, se tomaron muestras mensuales de 10 individuos desde setiembre de 1993 hasta setiembre de 1994. Se midieron ...
Citotaxonomía comparativa de tres especies de Cichlasoma (Pisces: Cichlidae) nativas de Costa Rica
(Universidad de Costa Rica, 1991)
The karyotype oí three species oí CichlasofM: C. dOllii, C. managwmse and C. friedrichstali were studied.
The number of diploid chromosomes is 2n=48 in the fust two species. Their karyotypes are composed of four pairs ...
Hormone-induced spawning of wild and captive-grown spotted rose snapper Lutjanus guttatus using carp pituitary suspension and human chorionic gonadotropin
(Universidad Autónoma de Baja California, México, 2011)
Hormone-induced spawning of the spotted rose snapper Lutjanus guttatus was studied using wild and cage-grown fish. Carp
pituitary suspension (CPS) and human chorionic gonadotropin (hCG) were assessed. Wild females (0.7–2.1 ...
Nitrogen budget and fluxes in Colossoma macropomum ponds
(Blackwell Publishing Ltd., 2005-07-01)
This study quanti¢ed the accumulation of nitrogen (N) in the water column, sediments, ¢sh and seepage water during a production cycle of Colossoma macropomum. By combining estimates of the deposition rates of uneaten feed, ...
Organic matter sedimentation and resuspension in tilapia (Oreochromis niloticus) ponds during a production cycle
(2002-07-01)
The rates of sedimentation and resuspension of organic carbon and total nitrogen were
measured in earthen fishponds, based on nutrient input, water quality parameters and fish size and biomass. Material collected in ...
Influencia del pez León (Pterois miles y Pterois volitans) en la cadena de valor de la pesca artesanal, Caribe sur de Costa Rica
(Universidad Estatal a Distancia (Costa Rica), 2019-08-23)
“Lionfish (Pterois miles and Pterois volitans) influence on
the artisanal fishing value chain, Southern Caribbean of Costa Rica”.
Introduction: The “Lionfish” are actually two invasive species that occur
in several parts ...
Growth and alkaline digestive proteases activity of Parachromis dovii larvae fed live prey and formulated diets with different protein sources
(Universidad Técnica de Manabí (Ecuador), 2022-07-16)
Parachromis dovii is a carnivorous cichlid fish from Central America, which easily accepts formulated feeds since exogenous feeding starts; however, its larval growth is lower than that obtained using live food. For this ...
Composición, diversidad y abundancia de peces en el embalse Arenal, Guanacaste, Costa Rica
(Universidad de Costa Rica (Costa Rica), 1989-11-01)
The abundance, species diversity. richneiS, dominance, evenness and similarity índices of the fish cornmunities at two stations in the Arenal Reservoir, Guanacaste, Costa Rica, were estimated between April 1984 and April ...
Comunidad de peces arrecifales: posibles afectaciones del cambio climático
(Environment & Technology Foundation (Colombia), 2021)
Las comunidades ícticas de los sistemas arrecifales están siendo presionadas como consecuencia del cambio climático sobre los ecosistemas marinos, especialmente por el aumento de la temperatura, la acidificación y la ...