The life history responses of the abalone pest, Terebrasabella heterouncinata, under natural and aquaculture conditions
The sabellid, Terebrasabella heterouncinata, is a small (<5 mm) intratubular brooder that lives in burrows within the host s shell matrix. It is a semi-continuous breeder and despite producing small numbers of large eggs, infestation by this animal has reached epidemic proportions on local abalon...
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Marine Biology
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ftrhodesunivcory:vital:6773 2024-06-09T07:50:06+00:00 The life history responses of the abalone pest, Terebrasabella heterouncinata, under natural and aquaculture conditions Simon, Carol A Kaiser, Horst Britz, Peter J 2005 19 pages pdf http://hdl.handle.net/10962/d1008074 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:6773 English eng Marine Biology vital:6773 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:6773 http://hdl.handle.net/10962/d1008074 Article 2005 ftrhodesunivcory 2024-05-16T14:25:24Z The sabellid, Terebrasabella heterouncinata, is a small (<5 mm) intratubular brooder that lives in burrows within the host s shell matrix. It is a semi-continuous breeder and despite producing small numbers of large eggs, infestation by this animal has reached epidemic proportions on local abalone farms. The present study compared the morphometrics and reproductive characteristics of worms from farmed and wild abalone, in the Walker Bay area of the south Western Cape Province of South Africa, to gain insights into why this animal has become so successful under aquaculture conditions. The farms designated farm A and farm B each had one on-farm site, and two wild sites, while farm C had two on-farm sites and two wild sites. The wild sites were natural abalone habitats located within 2.5 km of the farms. Our results conclusively showed that environmental conditions prevalent on the farms enhanced the reproductive success of these worms relative to that observed in its natural environment. At farms B and C, worms occurred in significantly higher densities at the on-farm sites than in the corresponding wild samples, but at farm A, density was equally low at the three sites. At all three farms, a greater proportion of the population was reproductively active in the on-farm samples than in the wild samples. Worms on farmed abalone had a higher instantaneous fecundity, brooded more clutches simultaneously and were larger than their conspecifics from the wild. There was a positive correlation between adult size and brood size and the number of clutches brooded simultaneously. Within the three on-farm sites there was a negative correlation between egg volume and brood size, indicating a trade-off between these traits. However, such a trade-off was not apparent between sites, with brood size being higher at the on-farm sites than at the wild sites, irrespective of egg size. This suggests that the stable nutrient-enriched environment on the farm led to an increase in fecundity without compromising the size (and ... Article in Journal/Newspaper Walker Bay Rhodes University Cory: Repository Burrows ENVELOPE(163.650,163.650,-74.300,-74.300) Walker Bay ENVELOPE(-60.700,-60.700,-62.633,-62.633) |
institution |
Open Polar |
collection |
Rhodes University Cory: Repository |
op_collection_id |
ftrhodesunivcory |
language |
English |
description |
The sabellid, Terebrasabella heterouncinata, is a small (<5 mm) intratubular brooder that lives in burrows within the host s shell matrix. It is a semi-continuous breeder and despite producing small numbers of large eggs, infestation by this animal has reached epidemic proportions on local abalone farms. The present study compared the morphometrics and reproductive characteristics of worms from farmed and wild abalone, in the Walker Bay area of the south Western Cape Province of South Africa, to gain insights into why this animal has become so successful under aquaculture conditions. The farms designated farm A and farm B each had one on-farm site, and two wild sites, while farm C had two on-farm sites and two wild sites. The wild sites were natural abalone habitats located within 2.5 km of the farms. Our results conclusively showed that environmental conditions prevalent on the farms enhanced the reproductive success of these worms relative to that observed in its natural environment. At farms B and C, worms occurred in significantly higher densities at the on-farm sites than in the corresponding wild samples, but at farm A, density was equally low at the three sites. At all three farms, a greater proportion of the population was reproductively active in the on-farm samples than in the wild samples. Worms on farmed abalone had a higher instantaneous fecundity, brooded more clutches simultaneously and were larger than their conspecifics from the wild. There was a positive correlation between adult size and brood size and the number of clutches brooded simultaneously. Within the three on-farm sites there was a negative correlation between egg volume and brood size, indicating a trade-off between these traits. However, such a trade-off was not apparent between sites, with brood size being higher at the on-farm sites than at the wild sites, irrespective of egg size. This suggests that the stable nutrient-enriched environment on the farm led to an increase in fecundity without compromising the size (and ... |
format |
Article in Journal/Newspaper |
author |
Simon, Carol A Kaiser, Horst Britz, Peter J |
spellingShingle |
Simon, Carol A Kaiser, Horst Britz, Peter J The life history responses of the abalone pest, Terebrasabella heterouncinata, under natural and aquaculture conditions |
author_facet |
Simon, Carol A Kaiser, Horst Britz, Peter J |
author_sort |
Simon, Carol A |
title |
The life history responses of the abalone pest, Terebrasabella heterouncinata, under natural and aquaculture conditions |
title_short |
The life history responses of the abalone pest, Terebrasabella heterouncinata, under natural and aquaculture conditions |
title_full |
The life history responses of the abalone pest, Terebrasabella heterouncinata, under natural and aquaculture conditions |
title_fullStr |
The life history responses of the abalone pest, Terebrasabella heterouncinata, under natural and aquaculture conditions |
title_full_unstemmed |
The life history responses of the abalone pest, Terebrasabella heterouncinata, under natural and aquaculture conditions |
title_sort |
life history responses of the abalone pest, terebrasabella heterouncinata, under natural and aquaculture conditions |
publisher |
Marine Biology |
publishDate |
2005 |
url |
http://hdl.handle.net/10962/d1008074 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:6773 |
long_lat |
ENVELOPE(163.650,163.650,-74.300,-74.300) ENVELOPE(-60.700,-60.700,-62.633,-62.633) |
geographic |
Burrows Walker Bay |
geographic_facet |
Burrows Walker Bay |
genre |
Walker Bay |
genre_facet |
Walker Bay |
op_relation |
vital:6773 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:6773 http://hdl.handle.net/10962/d1008074 |
_version_ |
1801383289773096960 |