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Climate impacts on the landings of Indian oil sardine over the south‐eastern Arabian Sea

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Relation http://eprints.cmfri.org.in/14827/
https://onlinelibrary.wiley.com/doi/epdf/10.1111/faf.12513
https://doi.org/10.1111/faf.12513
 
Title Climate impacts on the landings of Indian oil sardine over the south‐eastern Arabian Sea
 
Creator Hamza, Faseela
Valsala, Vinu
Anju, Mallissery
George, Grinson
 
Subject Oil sardine
Marine Fisheries
Climate Change
Pelagic Fisheries
 
Description The landings of Indian oil sardine (Sardinella longiceps, Clupeidae) along the southeastern
Arabian Sea are about 43.8% of total Indian oil sardine production. The annual
landings of this species exhibit large-scale variability with prolonged years of
surplus or deficit landings without identified reason. Evaluating Indian oil sardine
landings along the Kerala coast during 1961–2017 in relation to environmental variations,
we have elucidated a putative link between variability in landings versus environmental
parameters and climate indices. The variables examined in this study,
such as salinity and temperature along with physical indices such as upwelling and
mixed layer depth (MLD) of the ocean help to propose a mechanism to temporal variability
in the landings of Indian oil sardine. Colder temperature and timely intense upwelling
lead to nutrient enrichment in the surface water, which promotes the growth
of phytoplankton (chl-a) and thereby food availability to Indian oil sardine are found
during years with surplus catch. Less saline surface waters and shoaling of MLD at
these times could lead to the aggregation of fish at particular depths and thereby
a good catches. The reverse mechanism, such as more surface saline water, warm
temperature, downwelling or weak upwelling, and less nutrient enrichment, leads
to deficit landings. Further, it was noticed that the Pacific decadal oscillation and
Atlantic multidecadal oscillation have a more pronounced impact on Indian oil sardine
landings over the coast of south-eastern Arabian Sea than previously reported ENSO
associated impacts. All these point towards climate change implications for the Indian
oil sardine fishery.
 
Publisher Wiley
 
Date 2020
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/14827/1/Fish%20and%20Fisheries_2020_Grinson%20George_Climate%20impacts%20on%20the%20landings%20of%20Indian%20oil%20sardine.pdf
Hamza, Faseela and Valsala, Vinu and Anju, Mallissery and George, Grinson (2020) Climate impacts on the landings of Indian oil sardine over the south‐eastern Arabian Sea. Fish and Fisheries. pp. 1-19.