Stocking density and its influence on the productivity of red cusk eel, Genypterus chilensis (Guichenot, 1848), in shallow raceways

ABSTRACT. We compared the growth properties of red cusk eel Genypterus chilensis with initial mean weight ± standard error, 106.2 ± 6.1 g reared in shallow raceways at three different stocking densities (28.5, 46.1, and 60.7 kg m−3) in a 226-day long growth trial at a constant temperature...

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Autores principales:	Foss,Atle, Imsland,Albert K.D., Briceño,Felipe A., Magnolfi,Spartaco, Magnolfi,Piero, Gutiérrez,Xavier
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2020
Materias:	Genypterus chilensis red cusk eel stocking density growth shallow raceways aquaculture
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2020000500818
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spelling	oai:scielo:S0718-560X20200005008182020-11-18Stocking density and its influence on the productivity of red cusk eel, Genypterus chilensis (Guichenot, 1848), in shallow racewaysFoss,AtleImsland,Albert K.D.Briceño,Felipe A.Magnolfi,SpartacoMagnolfi,PieroGutiérrez,Xavier Genypterus chilensis red cusk eel stocking density growth shallow raceways aquaculture ABSTRACT. We compared the growth properties of red cusk eel Genypterus chilensis with initial mean weight ± standard error, 106.2 ± 6.1 g reared in shallow raceways at three different stocking densities (28.5, 46.1, and 60.7 kg m−3) in a 226-day long growth trial at a constant temperature of 17°C. There was a trend towards higher specific growth rates at the highest density. Final mean weights were 333 ± 12, 352 ± 12, and 354 ± 15 g, at the 30, 45, and 60 kg m−3 density, respectively. Overall, the growth rates were higher in the 60 kg m−3 density group than the two other density groups. The daily feeding intake (%) was higher in the medium (0.51), and high (0.55) density groups compared the low-density group (0.45). Feed conversion efficiency (FCE) did not differ between the density groups. A significant size rank correlation was maintained in all density groups throughout the study. Calculated productivity increased almost linearly with increasing stocking density and was found to be 32, 34, and 39 g m−2 d−1 at 30, 45, and 60 kg m−3, respectively. The results show that the optimum density conditions for farming juvenile red cusk eel, both concerning growth rate, feed conversion, and productivity is at densities equal to or higher than 60 kg m−3.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.48 n.5 20202020-11-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2020000500818en10.3856/vol48-issue5-fulltext-2528
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Genypterus chilensis red cusk eel stocking density growth shallow raceways aquaculture
spellingShingle	Genypterus chilensis red cusk eel stocking density growth shallow raceways aquaculture Foss,Atle Imsland,Albert K.D. Briceño,Felipe A. Magnolfi,Spartaco Magnolfi,Piero Gutiérrez,Xavier Stocking density and its influence on the productivity of red cusk eel, Genypterus chilensis (Guichenot, 1848), in shallow raceways
description	ABSTRACT. We compared the growth properties of red cusk eel Genypterus chilensis with initial mean weight ± standard error, 106.2 ± 6.1 g reared in shallow raceways at three different stocking densities (28.5, 46.1, and 60.7 kg m−3) in a 226-day long growth trial at a constant temperature of 17°C. There was a trend towards higher specific growth rates at the highest density. Final mean weights were 333 ± 12, 352 ± 12, and 354 ± 15 g, at the 30, 45, and 60 kg m−3 density, respectively. Overall, the growth rates were higher in the 60 kg m−3 density group than the two other density groups. The daily feeding intake (%) was higher in the medium (0.51), and high (0.55) density groups compared the low-density group (0.45). Feed conversion efficiency (FCE) did not differ between the density groups. A significant size rank correlation was maintained in all density groups throughout the study. Calculated productivity increased almost linearly with increasing stocking density and was found to be 32, 34, and 39 g m−2 d−1 at 30, 45, and 60 kg m−3, respectively. The results show that the optimum density conditions for farming juvenile red cusk eel, both concerning growth rate, feed conversion, and productivity is at densities equal to or higher than 60 kg m−3.
author	Foss,Atle Imsland,Albert K.D. Briceño,Felipe A. Magnolfi,Spartaco Magnolfi,Piero Gutiérrez,Xavier
author_facet	Foss,Atle Imsland,Albert K.D. Briceño,Felipe A. Magnolfi,Spartaco Magnolfi,Piero Gutiérrez,Xavier
author_sort	Foss,Atle
title	Stocking density and its influence on the productivity of red cusk eel, Genypterus chilensis (Guichenot, 1848), in shallow raceways
title_short	Stocking density and its influence on the productivity of red cusk eel, Genypterus chilensis (Guichenot, 1848), in shallow raceways
title_full	Stocking density and its influence on the productivity of red cusk eel, Genypterus chilensis (Guichenot, 1848), in shallow raceways
title_fullStr	Stocking density and its influence on the productivity of red cusk eel, Genypterus chilensis (Guichenot, 1848), in shallow raceways
title_full_unstemmed	Stocking density and its influence on the productivity of red cusk eel, Genypterus chilensis (Guichenot, 1848), in shallow raceways
title_sort	stocking density and its influence on the productivity of red cusk eel, genypterus chilensis (guichenot, 1848), in shallow raceways
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2020000500818
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Stocking density and its influence on the productivity of red cusk eel, Genypterus chilensis (Guichenot, 1848), in shallow raceways

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