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

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dc.creator Mgaya, Yunus D.
dc.creator Mercera, John P.
dc.date 2016-01-29T05:18:49Z
dc.date 2016-01-29T05:18:49Z
dc.date 1995-11-15
dc.date.accessioned 2021-05-03T13:36:38Z
dc.date.available 2021-05-03T13:36:38Z
dc.identifier Mgaya, 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: 297-312
dc.identifier 10.1016/0044-8486(95)00066-6
dc.identifier http://hdl.handle.net/123456789/224
dc.identifier.uri http://hdl.handle.net/123456789/47672
dc.description The 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), ...
dc.description The 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.
dc.language en
dc.publisher Elsevier
dc.subject Haliotis tuberculata
dc.subject Size grading
dc.subject Stocking density
dc.subject Growth
dc.subject Biomass-mollusc
dc.title The effects of size grading and stocking density on growth performance of juvenile abalone
dc.title Haliotis tuberculataLinnaeus. Aquaculture
dc.type Journal Article, Peer Reviewed


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