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Meeting
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MeetingSeasonal abundance of the tropical tunas around fish aggregating devices anchored off the coast of Mauritius (2010-2012) 2013
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No results found.Catch rates of the pelagic species around the Fish Aggregating Devices (aFADs) anchored off the Western coast of Mauritius show that the seasol variation of the sea surface temperature (SST) has a significant influence on the abundance of the tropical tu. The results of the study carried out over the period 2010 to 2012 suggest that the season of relative abundance for the skipjack tu (Katsuwonus pelamis) is more pronounced during the summer months when SST is higher. The study on the other hand indicates that the yellow fin tu (Thunnus albacares) prefers the cooler waters which prevail both at start of winter and at the outset of the summer season. The broad annual migration of the yellow fin and skipjack tus around the anchored FADs is noticeably associated with the annual SST cycle. The results also indicated a marked scarcity in the presence of the big eye tu (Thunnus obesus) in the landings of the artisal FAD fishery. In contrast, data on landings from the licensed industrial fore ign long liners operating mostly in the EEZ of Mauritius illustrate that both the yellow fin and the skipjack tus abound during the summer season. In addition, the landings of the semi-industrial local fleet (long liners <24m) primarily targeting swordfish in Mauritius waters included the big eye tu (mostly caught in the winter season) and the yellow fin tu (all year round). This paper highlights the results based on the alyses on the fish catch data collected from the professiol artisal fisherm en operating around FADs off the Western coast of Mauritius with discussion on the relation between effort, SST and the seasol abundance of the tropical yellow fin and skipjack tu. -
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