Smooth fan lobster Ibacus novemdentatus in the southwestern Indian Ocean: an overlooked fisheries resource?

Bottom-trawl data collected by the RV Dr Fridtjof Nansen off Mozambique (in 1990, 2007 and 2018) and off eastern South Africa (in 2018) were analysed to investigate the distribution, abundance and size composition of the smooth fan lobster Ibacus novemdentatus as a potential fisheries resource. The...

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Bibliographic Details
Published in:African journal of marine science 2019-10, Vol.41 (3), p.305-312
Main Authors: Groeneveld, JC, Zacarias, LD, Singh, SP
Format: Article
Language:English
Subjects:
crustaceans
Deep water
deep-water trawls
EAF-Nansen Programme
Fisheries
fisheries development
Fishery data
Fishery resources
Hot spots
Ibacus novemdentatus
Lobsters
Marine crustaceans
mixed-species catches
Mud banks
Shellfish
Size distribution
Species
survey data
Trawling
Trawlnets
Water depth
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Summary:Bottom-trawl data collected by the RV Dr Fridtjof Nansen off Mozambique (in 1990, 2007 and 2018) and off eastern South Africa (in 2018) were analysed to investigate the distribution, abundance and size composition of the smooth fan lobster Ibacus novemdentatus as a potential fisheries resource. The lobsters occurred shallower (depth 53-297 m) than traditional deep-water trawl grounds, were concentrated in 'hotspots' at the seaward edges of sand/mud banks at the Thukela Bank, Delagoa Bight and Sofala Bank, and exhibited segregated juvenile and adult populations. Three other high-value lobster species and several marketable teleost species occurred in trawl nets where I. novemdentatus was present. Further exploration by trawling should be considered to better define hotspots of adults of this species and to investigate the contribution that I. novemdentatus could make to mixed-species commercial catches.
ISSN:1814-232X
1814-2338
DOI:10.2989/1814232X.2019.1654545