The effects of size grading and stocking density on growth performance of juvenile abalone

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dc.contributor.authorMgaya, Yunus D.
dc.contributor.authorMercera, John P.
dc.date.accessioned2016-01-29T05:18:49Z
dc.date.available2016-01-29T05:18:49Z
dc.date.issued1995-11-15
dc.descriptionThe effects of size grading and stocking density on the growth of juvenile European abalone, Haliotis tuberculata L.(Gastropoda: Haliotidae) were assessed in the hatchery. Animals were held in cages deployed in a flowtray with recirculating seawater maintained at 18±2° C, and fed ad libitum on the red alga Palmaria palmata (L.) Kuntze. In the grading experiment juvenile abalone were divided into four populations consisting of small (mean±se; initial shell length= 15.3±0.15 mm; n= 35), medium (initial shell length= 19.6±0.16 mm; n= 35), ...en_US
dc.description.abstractThe effects of size grading and stocking density on the growth of juvenile European abalone, Haliotis tuberculata L. (Gastropoda: Haliotidae) were assessed in the hatchery. Animals were held in cages deployed in a flowtray with recirculating seawater maintained at 18 ± 2 °C, and fed ad libitum on the red alga Palmaria palmata (L.) Kuntze. In the grading experiment juvenile abalone were divided into four populations consisting of small (mean ± s.e; initial shell length = 15.3 ± 0.15 mm; n = 35), medium (initial shell length = 19.6 ± 0.16 mm; n = 35), large (initial shell length = 23.8 ± 0.17 mm; n = 35) and an ungraded control group (16.8 ± 0.41 mm; n = 35). Rearing was carried out over a period of 226 days, after which it could be concluded that an advantage in overall growth performance had been gained by grading the animals. There was evidence that growth of small abalone improved in the absence of larger conspecifics. In the stocking density experiment with two size grades and three stocking densities, a decreasing exponential relationship was found between growth (body weight and shell length) and stocking density, with a substantial amount of growth occurring at all densities. Final total biomass for both grades of abalone increased with density. For the smaller grade biomass gain increased as density increased. However, for the larger grade biomass gain declined at higher density. Overall mean survival (± s.e) was 98.3 ± 0.4% and was not influenced by density. It is suggested that the choice of stocking density is essentially a trade-off between maximum growth, optimal biomass gain, and economic considerations which may dictate densities that would result in a net reduction in overall production costs.en_US
dc.identifier.citationMgaya, Y.D. and Mercer, J.P., 1995. The effects of size grading and stocking density on growth performance of juvenile abalone, Haliotis tuberculata Linnaeus. Aquaculture, 136: 297-312en_US
dc.identifier.other10.1016/0044-8486(95)00066-6
dc.identifier.urihttp://hdl.handle.net/123456789/224
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectHaliotis tuberculataen_US
dc.subjectSize gradingen_US
dc.subjectStocking densityen_US
dc.subjectGrowthen_US
dc.subjectBiomass-molluscen_US
dc.titleThe effects of size grading and stocking density on growth performance of juvenile abaloneen_US
dc.title.alternativeHaliotis tuberculataLinnaeus. Aquacultureen_US
dc.typeJournal Article, Peer Revieweden_US
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