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

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Relation http://eprints.cmfri.org.in/15773/
https://www.sciencedirect.com/science/article/pii/S2352485522000160?via%3Dihub
https://doi.org/10.1016/j.rsma.2022.102191
 
Title Seasonality in recurrent Potential Fishing Zones along India’s Southwest coast and its relationship to the prevailing hydrographic settings
 
Creator Nair, Preetha G
Joseph, Shoji
Pillai, V N
Mohamed Hatha, A A
 
Subject Oceanography
Fishery Technology
Fishing
 
Description 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.
 
Publisher Elsevier B.V.
 
Date 2022
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/15773/1/Regional%20Studies%20in%20Marine%20Science_2022_Preetha%20G%20Nair.pdf
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.