Year of publication 2013

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Product type Meeting

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Edition 1

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Synopsis (short abstract) The impact of Indian Ocean Dipole Mode (IOD) and El Niño-Southern Oscillation (ENSO) events on catches of yellowfin tu (Thunnus albacares) (YFT) in the Eastern Indian Ocean (EIO) off Java was alyzed through the use of remotely sensed environmental data (sea surface temperature/ SST and chlorophyll-a concentration/ SSC) and yellowfin tu catch data. Alyses were conducted for the period of 2003–2012, which included the strong positive dipole mode event in association with weak ENSO in 2006. Yellowf in tu catch data were based from the report of Palabuhanratu fishing port and remotely sensed environmental data were based from MODIS-Aqua_NOAA. IOD has a significant effect on the catch composition and proportion of YFT. In the strong positive dipole mode event in 2006 and weak ENSO events in 2011 and 2012 the catch of YFT was higher than normal period. An increasing Catch Per Unit Effort (CPUE) of YFT started from May-June and reached the peak on September-October was noted, this might be due to upwelling evident before the increasing trend observed. High increase of YFT-CPUE occurred during strong positive dipole mode event (2006) and a weak ENSO events (2011 and 2012) might be related to the increase of abundance and distribution of chlorophyll-a and phytoplankton in those period. In contrast, YFT- CPUE was very low at the La-Ni event in 2005 while this species was still domint in the catch composition compared to other tu species.

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Statutory body / Meeting title Indian Ocean Tuna Commission (IOTC)

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Meeting symbol IOTC-2013-WPTT15-10

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Meeting Session Number 15

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Language English

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