Culture environment and hatchery of origin influence growth, condition and feeding organ morphology in the Pacific oyster Crassostrea gigas in South Africa

Nel, A; Pitcher, G; Richoux, Nicole B; Jackson, S

Title: Culture environment and hatchery of origin influence growth, condition and feeding organ morphology in the Pacific oyster Crassostrea gigas in South Africa
Creator: Nel, A
Creator: Pitcher, G
Creator: Richoux, Nicole B
Creator: Jackson, S
Subject: To be catalogued
Date Issued: 2014
Date: 2014
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/457215
Identifier: vital:75617
Identifier: xlink:href="https://doi.org/10.2989/1814232X.2014.982187"
Description: South Africa lacks a commercial oyster hatchery. To inform the sourcing of seed for future hatchery establishments, we compared half-sib Pacific oyster Crassostrea gigas cohorts from hatcheries in Namibia and Chile. We measured oyster growth, mortality, condition and feeding organ morphology in Algoa Bay (AB, Eastern Cape) and Saldanha Bay (SB, Western Cape), South Africa, from July 2011 to June 2012. Within SB, 14.3% of mean daily sea temperatures exceeded this species’ thermal optimum of 19 °C, compared to 50.5% in AB. Food abundance (mean daily chlorophyll a concentration) in SB (7.8 mg m–3) was double that in AB (3.9 mg m–3) where, presumably to increase particle clearance rates in a relatively phytoplankton-poor environment, oysters had larger gill:palp surface area ratios. Plankton fatty acid profiles (indicators of food quality) differed between locations. In AB, instantaneous growth rates differed between cohorts, and trends varied seasonally. Within both locations, condition index was usually higher in Chilean oysters, whereas shell density was higher in Namibian oysters. In AB only, Chilean seed suffered substantially higher summer mortalities than Namibian seed, suggesting that the latter are more suited to temperatures in AB. AB should also be assessed for culture of the indigenous oyster species that occur there.
Format: computer
Format: online resource
Format: application/pdf
Format: 1 online resource (11 pages)
Format: pdf
Publisher: Taylor and Francis Online
Language: English
Relation: African Journal of Marine Science
Relation: Nel, A., Pitcher, G., Richoux, N.B. and Jackson, S., 2014. A. African Journal of Marine Science, 36(4), pp.481-491
Relation: African Journal of Marine Science volume 36 number 4 p. 481 2014 1814-2338
Rights: Publisher
Rights: Use of this resource is governed by the terms and conditions of the Taylor and Francis Online Terms and Conditions Statement (https://www.tandfonline.com/terms-and-conditions)
Rights: Closed Access

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