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Subject: Fisheries Resource Management × Author: HARSHATH, D.G., × End date: 2021 × Start date: 2021 ×
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    ThesisItemOpen Access
    ASSESSMENT OF ICHTHYOFAUNAL BIODIVERSITY OF SWARNA RIVER ESTUARY OF UDUPI DISTRICT IN KARNATAKA.
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR, 2021) HARSHATH, D.G.,; H.N.ANJANAYAPPA
    The coastal ecosystems of Karnataka are situated closer to the Western Ghats, which are considered as one of the global biodiversity hotspots. In view of this, the present study was conducted on the ichthyofaunal diversity of estuarine system of Kodi-Bengre region, which gives important insights on the abundance and seasonality of fish diversity.From August 2019 - March 2020, a total of 65 species encountered belonging to 50 genera, 37 families and 11 orders were studied. Among them, Nematalosanasus was found to be the most dominant species. Out of 10 orders, the order Perciformes stands first, comprised of 22 families represented by 36 species and the order Clupiformes ranked second with 2 families represented by 6 species. The seasonal abundance of ichthyofaunal diversity recorded during post-monsoon (Oct-Jan) is more compared to pre-monsoon (Feb- March) and monsoon (Aug-Sep). The diversity indices including Margalef's richness index (d). Shannon-wiener index (H') (at log 10), Simpson index (A) and Pielou's evenness (J) were calculated. The K- dominance curve plot showed that the diversity of species was high near the bar mouth region and at the estuarine region. These showed the closely similar diversity and proved that the number of species (richness) is more near the bar mouth region. Bray-Curtis similarity index revealed that the maximum similarity was found between pre-monsoon and monsoon seasons at S2 and S1 station. And the same pattern was also evident in the MSD plot and the stress valve, which was overlain on the MSD plot (0.13, 0.1 and 0.09), showed a good ordination of the samples collected.Biodiversity of threatened ichthyofaunal species out of the recorded 65 species, 25 species were Not Evaluated, 35 species were Least Concern, 3 species were Data Deficient, 1 species was Vulnerable, and 1 species Critically Endangered was recorded from the Swarna River estuary.