Overfishing and Climate Drives Changes in Biology and Recruitment of the Indian Oil Sardine Sardinella longiceps in Southeastern Arabian Sea

Kripa, V and Mohamed, K S and Koya, K P Said and Jeyabaskaran, R and Prema, D and Padua, Shelton and Kuriakose, Somy and Anilkumar, P S and Nair, Preetha G and Ambrose, T V and Dhanya, G and Abhilash, K S and Bose, John and Divya, N D and Shara, A S and Vishnu, P G (2018) Overfishing and Climate Drives Changes in Biology and Recruitment of the Indian Oil Sardine Sardinella longiceps in Southeastern Arabian Sea. Frontiers in Marine Science. pp. 1-20.

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    Abstract

    The recent fluctuations in abundance of the Indian oil sardine Sardinella longiceps, a tropical small pelagic clupeid fish, was investigated in the light of overfishing and variations in its habitat ecology in southeastern Arabian Sea. In 2012, its landings peaked to an all-time record making it the fifth largest sardine fishery in the world, and within 3 years the catches were reduced to nearly a tenth of that level. This study examined the fishery dependant factors such as effort, catch rates and expansion of fishing area; the biological variations in fish size, maturity and recruitment; and tried to relate this to the environmental variations in the sardine habitat and food availability. The 2012 mega harvest was a result of a 2-time increase in gear size and engine capacity of fishing crafts and a 3.7-time increase in fishing effort. The female maturation process was strongly influenced primarily by rainfall and then by upwelling and the resulting influx of cold nutrient-rich water in the habitat from April much before the start of the monsoon in June. After 2013, the weak monsoons and the 2015 El Nino Southern Oscillation resulted in a warmer (by an average of 1.1°C) period which negatively impacted the maturation process. The abundance of jellyfishes which are larval and young fish predators in the habitat negatively affected recruitment after 2013. The mismatch in timing of phytoplankton productivity and sardine larvae in the habitat also affected the recruitment success. These environmental divergences coupled with the excessive capture (beyond maximum sustainable yields) of spawning stock and juveniles from 2010 has resulted in this biological catastrophe which has affected the livelihood of thousands of small-scale fishers. A more responsive fisheries administration with timely restriction on fishing effort and protection of spawning stocks by way of fishery closure would have helped minimize the impacts.

    Item Type: Article
    Subjects: CMFRI Departments > CMFRI-Kochi > Marine Capture > Pelagic Fisheries
    CMFRI > CMFRI-Kochi > Marine Capture > Pelagic Fisheries
    CMFRI-Kochi > Marine Capture > Pelagic Fisheries
    CMFRI-Kochi > Marine Capture > Pelagic Fisheries

    Marine Fisheries > Marine Fishing
    Pelagic Fisheries > Oil sardine
    Pelagic Fisheries > Pelagic Fishes
    Divisions: CMFRI-Kochi > Fishery Environment
    Subject Area > CMFRI > CMFRI-Kochi > Fishery Environment
    CMFRI-Kochi > Fishery Environment
    Subject Area > CMFRI-Kochi > Fishery Environment
    Depositing User: Arun Surendran
    Date Deposited: 06 Dec 2018 06:15
    Last Modified: 06 Dec 2018 06:15
    URI: http://eprints.cmfri.org.in/id/eprint/13262

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