Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters Crassostrea gigas
Farmed oysters host a diverse community of epifaunal and infaunal fouling taxa, including alienspecies, and these are easily translocated in the course of commercial oyster trade. We document the diversity and densities of fouling taxa associated with farmed oysters Crassostrea gigas in South Africa...
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ftjafricanj:oai:ojs.ajol.info:article/80349 2023-05-15T15:58:10+02:00 Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters Crassostrea gigas Haupt, TM Griffiths, CL Robinson, TB 2012-08-28 application/pdf http://www.ajol.info/index.php/ajms/article/view/80349 eng eng NISC http://www.ajol.info/index.php/ajms/article/view/80349/70597 http://www.ajol.info/index.php/ajms/article/view/80349 Copyright for articles published in this journal is retained by the publisher. African Journal of Marine Science; Vol 34, No 2 (2012) 1814-232X info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2012 ftjafricanj 2017-03-05T06:34:25Z Farmed oysters host a diverse community of epifaunal and infaunal fouling taxa, including alienspecies, and these are easily translocated in the course of commercial oyster trade. We document the diversity and densities of fouling taxa associated with farmed oysters Crassostrea gigas in South Africa, how effectively these are removed by conventional cleansing techniques, and whether those that remain after cleansing survive intra-regional translocation. Over 40 invertebrate species belonging to 11 major taxa were found living on farmed oysters. Both mean abundance (A) and biomass (B) of invertebrate taxa associated with uncleansed oysters (A: 79.48, SD 233.10; B: 0.034 g, SD 0.314) were greatly reduced following cleansing (A: 2.30, SD 7.65; B: 0.0003 g, SD 0.002), but small numbers survived even after translocation (A: 1.87, SD 7.43; B: 0.006 g, SD 0.020). We examined the effectiveness of exposing oysters to either fresh water or heated seawater as a more thorough cleansing regimen to prevent the translocation of such taxa. Oysters survived soaking in fresh water (0% mortality after 18 h) better than immersion in heated seawater (26.7% mortality after 40 s), but associated organisms were more effectively eliminated by the latter treatment. However, as some taxa survived both types of treatment, translocation of oysters would still pose some bio-security risks, even following such treatments.Keywords: alien species, biosecurity, cleansing procedures, epifauna, infauna, oyster, South AfricaAfrican Journal of Marine Science 2012, 34(2): 187–194 Article in Journal/Newspaper Crassostrea gigas AJOL - African Journals Online Pacific |
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AJOL - African Journals Online |
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ftjafricanj |
language |
English |
description |
Farmed oysters host a diverse community of epifaunal and infaunal fouling taxa, including alienspecies, and these are easily translocated in the course of commercial oyster trade. We document the diversity and densities of fouling taxa associated with farmed oysters Crassostrea gigas in South Africa, how effectively these are removed by conventional cleansing techniques, and whether those that remain after cleansing survive intra-regional translocation. Over 40 invertebrate species belonging to 11 major taxa were found living on farmed oysters. Both mean abundance (A) and biomass (B) of invertebrate taxa associated with uncleansed oysters (A: 79.48, SD 233.10; B: 0.034 g, SD 0.314) were greatly reduced following cleansing (A: 2.30, SD 7.65; B: 0.0003 g, SD 0.002), but small numbers survived even after translocation (A: 1.87, SD 7.43; B: 0.006 g, SD 0.020). We examined the effectiveness of exposing oysters to either fresh water or heated seawater as a more thorough cleansing regimen to prevent the translocation of such taxa. Oysters survived soaking in fresh water (0% mortality after 18 h) better than immersion in heated seawater (26.7% mortality after 40 s), but associated organisms were more effectively eliminated by the latter treatment. However, as some taxa survived both types of treatment, translocation of oysters would still pose some bio-security risks, even following such treatments.Keywords: alien species, biosecurity, cleansing procedures, epifauna, infauna, oyster, South AfricaAfrican Journal of Marine Science 2012, 34(2): 187–194 |
format |
Article in Journal/Newspaper |
author |
Haupt, TM Griffiths, CL Robinson, TB |
spellingShingle |
Haupt, TM Griffiths, CL Robinson, TB Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters Crassostrea gigas |
author_facet |
Haupt, TM Griffiths, CL Robinson, TB |
author_sort |
Haupt, TM |
title |
Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters Crassostrea gigas |
title_short |
Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters Crassostrea gigas |
title_full |
Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters Crassostrea gigas |
title_fullStr |
Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters Crassostrea gigas |
title_full_unstemmed |
Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters Crassostrea gigas |
title_sort |
intra-regional translocations of epifaunal and infaunal species associated with cultured pacific oysters crassostrea gigas |
publisher |
NISC |
publishDate |
2012 |
url |
http://www.ajol.info/index.php/ajms/article/view/80349 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_source |
African Journal of Marine Science; Vol 34, No 2 (2012) 1814-232X |
op_relation |
http://www.ajol.info/index.php/ajms/article/view/80349/70597 http://www.ajol.info/index.php/ajms/article/view/80349 |
op_rights |
Copyright for articles published in this journal is retained by the publisher. |
_version_ |
1766393895712718848 |