Seasonal variability in physicochemical parameters and fish larval abundance along the coastal waters of Dakshina Kannada, southwest coast of India

Lavanya, R and Rohit, Prathibha and Sulochanan, Bindu and Pranav, P and Raj, Ranith (2024) Seasonal variability in physicochemical parameters and fish larval abundance along the coastal waters of Dakshina Kannada, southwest coast of India. Journal of the Marine Biological Association of India, 66 (1). pp. 22-34. ISSN 2321-7898

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    Abstract

    The study attempted to record the seasonal variability in the physicochemical parameters that influence the fish larval abundance in six stations from the Netravathi-Gurupura and the Mulki-Pavanje estuaries along the coast of Dakshina Kannada for a period of 36 months (2014-2016). Pronounced variations in the primary production, chlorophyll a, and physicochemical parameters such as water temperature, pH, salinity, dissolved oxygen, and nutrients were observed in the estuarine and coastal waters. Between stations, the one-way ANOVA revealed highly significant variations (p<0.001) in pH, salinity, Chlorophyll a, Nitrate-N, Ammonia- N, and Silicate-Si concentrations and significant differences in dissolved oxygen and chlorophyll c (p< 0.05) concentrations. Multivariate comparisons (Tukey HSD) revealed variations in the physicochemical parameters within the stations. Nearshore stations and estuarine waters were distinct concerning physicochemical parameters. Environmental factors influencing fish larval abundance in the nearshore waters include rainfall (r = 0.487, p< 0.01), river discharge (r = 0.444, p< 0.01), dissolved oxygen (r = 0.395, p< 0.05), and silicate-Si concentration (r = 0.423, p<0.05). Similarly, the tidal height (r= 0.536, p<0.01) also played an additional key role in influencing and determining the seasonal abundance of fish larvae in the estuarine waters. The water quality index (WQI) in estuaries and nearshore waters is indicated as Good to Poor state as per USEPA (2012) rating. Improving the quality of near-shore coastal waters can increase the survival of fish larvae, protect fish breeding sites, and ultimately contribute to enhanced fisheries productivity

    Item Type: Article
    Uncontrolled Keywords: Fish larvae; nearshore waters; tropical estuarine waters; physicochemical parameters; hydrography
    Subjects: Oceanography > Coastal Zone Management
    Oceanography > Hydrology
    Eggs and Larvae
    Divisions: CMFRI-Kochi > Marine Biodiversity, Environment and Management Division
    Subject Area > CMFRI > CMFRI-Kochi > Marine Biodiversity, Environment and Management Division
    CMFRI-Kochi > Marine Biodiversity, Environment and Management Division
    Subject Area > CMFRI-Kochi > Marine Biodiversity, Environment and Management Division
    Depositing User: Arun Surendran
    Date Deposited: 19 Jun 2024 10:51
    Last Modified: 19 Jun 2024 10:51
    URI: http://eprints.cmfri.org.in/id/eprint/18535

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