Seasonality in recurrent Potential Fishing Zones along India’s Southwest coast and its relationship to the prevailing hydrographic settings

Nair, Preetha G and Joseph, Shoji and Pillai, V N and Mohamed Hatha, A A (2022) Seasonality in recurrent Potential Fishing Zones along India’s Southwest coast and its relationship to the prevailing hydrographic settings. Regional Studies in Marine Science, 51. pp. 1-15.

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    Abstract

    This study presents the linkage between recurrent (repeat) Potential Fishing Zones (PFZ) and seasonal hydrographic conditions along India’s Southwest (Kerala) coast in the Southeastern Arabian Sea (SEAS). The PFZ advisories released by the Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, India are based on the fact that ocean processes that enhance biological production leave imprints on surface ocean parameters that can be tracked using satellite remote sensing techniques and used to forecast fish availability. Sea surface temperature and chlorophyll-a features of satellite remote sensing data sets usually coincide in regions and situations where physical processes and biological responses are closely coupled, which is used by INCOIS to create PFZ advisories. Nonetheless, it is unknown how PFZ frequency varies seasonally or how the recurrent PFZs are related to the region’s predominant seasonal hydrographic settings, which have been addressed here based on a retrospective analysis of PFZs disseminated by INCOIS in advisories distributed over five years (2008–2012). For the current investigation, 432 PFZ advisories over five years were analysed, and the regions of repeat PFZs were demarcated every month along the Kerala coast in the SEAS. This study found that almost all of the very prominent repeat PFZs are formed within the 50 m depth contour and the most frequent and pronounced repeat PFZs were observed across the entire SEAS during the Northeast Monsoon in December, January, and February. On the other hand, the lowest repeat PFZs were discovered in April and May, during the Pre-monsoon season. We show that that the observed increase in repeat PFZs in the study area during the Northeast Monsoon is primarily due to the hydrographical setting created by the intrusion of low-salinity Bay of Bengal waters, which has the potential to increase the occurrence of mesoscale and sub-mesoscale ocean surface features such as fronts and eddies that might get imprinted as more frequent and prominant repeat PFZs in the study area. Instead, very weak winds and thermally stratified surface waters during the Pre-monsoon result in fewer cases of physical processes to enhance plankton production, resulting in a low frequency of imprints in satellite data sets and low repeat PFZs.

    Item Type: Article
    Uncontrolled Keywords: Plankton;Food web; Potential Fishing Zone; Fishes; Southeastern Arabian Sea
    Subjects: Oceanography
    Fishery Technology
    Fishery Technology > Fishing
    Divisions: CMFRI-Kochi > Fishery Environment
    Subject Area > CMFRI > CMFRI-Kochi > Fishery Environment
    CMFRI-Kochi > Fishery Environment
    Subject Area > CMFRI-Kochi > Fishery Environment

    CMFRI-Kochi > Mariculture
    Subject Area > CMFRI > CMFRI-Kochi > Mariculture
    CMFRI-Kochi > Mariculture
    Subject Area > CMFRI-Kochi > Mariculture
    Depositing User: Arun Surendran
    Date Deposited: 11 Feb 2022 04:28
    Last Modified: 11 Feb 2022 04:28
    URI: http://eprints.cmfri.org.in/id/eprint/15773

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