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Collecting device for zooplankton associated with mesophotic coral ecosystems 50
Contreras-Vega,Laura; Henao-Castro,Alejandro; Navas-S.,Gabriel R.; Criales,María Isabel; Pascuales,Milena Marrugo.
ABSTRACT Mesophotic coral ecosystems (MCEs) host unique communities that have not been sufficiently studied due to the high cost of available technologies. These reefs can be found between 30 and 150 m deep, where the amount of incident light is < 10 % of that reaching the surface. The zooxanthellae associated with these reefs have a reduced photosynthetic rate due to the low availability of light, therefore, zooplankton becomes the main food source for the coral colonies. To study the composition of zooplankton communities associated to these ecosystems, a device that allowed the collection of zooplankton present on the Bajo Fríjol reef scaffold was designed and tested in the Corales de Profundidad National Natural Park. The device consisted of a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mesophotic reefs; Collection device; Zooplankton.
Ano: 2020 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612020000300243
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Determination of sexual dimorphism using morphometric techniques in Rachycentron canadum (Perciformes: Rachycentridae) cultivated in captivity 50
González G.,Roy; Bermúdez Tobón,Adriana; Navas-S.,Gabriel R..
ABSTRACT Rachycentron canadum is an economically important fish in aquaculture due to its resistance to environmental variations, the feasibility of culture in confinement, high growth rates, and good acceptance by consumers. The profitability of their cage culture is negatively affected by the difficulty of implementing monosex cultures due to the apparent similarity between sexes. In this study, morphometric techniques were used to determine sexual dimorphism by analyzing measurements and the fish’s shape. Differences were found between the sexes in the position of the eyes, lips, pectoral fin and ventral fin, and the body’s general shape. The sexing precision of the individuals was 75.4 % with distances and 82.7 % with geometric morphometry.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cobia; Geometric morphometry; Distances morphometrics; Colombian Caribbean..
Ano: 2021 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000100079
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