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The present study used surplus production models for the assessment of fisheries stock and to evaluate the marine fishery status of Tamil Nadu. Present study computed and analysed annual catch and effort between 1998 and 2018 using Catch Effort Data Analysis (CEDA) software. The mean annual catch of Tamil Nadu marine fisheries was 4.14 lakh tonnes, ranging from 2.87 lakh tonnes (2005) to 5.20 lakh tonnes (2018). The Biological Reference Points (BRP), such as Maximum Sustainable Yield (MSY), Biomass at MSY (BMSY), and Fishing mortality at MSY (FMSY), were estimated using three error assumptions (Normal, Log Normal and Gamma) of Fox, Schaefer, and Pella-Tomlinson production models for Initial Proportion (IP) ranging from 0.1 to 1. From the results, MSY, BMSY and FMSY estimated by the best fit Schaefer-Log Normal (IP value of 0.8) were 5.32 lakh tonnes, 35.3 million tonnes and 0.151, respectively. The BRP determined from the Schaefer and Pella-Tomlinson models was similar. The predicted MSY values were higher than the most recent catch (5.20 lakh tonnes) of 2018. According to the reference point results, the stocks are secure; however, it is advised to keep fishing at present level in order to preserve the stock at a nearly optimal fishing pressure. [ABSTRACT FROM AUTHOR]

Length-weight relationship of three deep sea fishes included in the Family Gempylidae, Neoepinnula orientalis (Gilchrist and von Bonde, 1924), Promethichthys prometheus (Cuvier, 1832) and Thyrsitoides marleyi (Fowler, 1929) were estimated and presented. These fishes inhabited at the continental slope region of more than 1500 metres. Results of lengthweight relationship of these fishes showed an isometric growth except for N. orientalis. [ABSTRACT FROM AUTHOR]

Specimens of Tentoriceps sp. belonging to the Family Trichiuridae were collected from the trawlers operated along off Nattika, Kalamukk and Sakthikulangara (Kerala ) and Tuticorin (Tamil nadu), India at a depth of 70-90 m. Specimens were identified following standard methods. Morphometric measurements and meristic counts of 55 specimens were presented. Specimens were subjected to molecular analysis. Diagnostic features, morphometric, meristic and phylogenetic analysis proved the taxonomic validity as Tentoriceps cristatus (Kluzinger, 1884). Full description of the species is provided and it is first record from the southern coast of India. [ABSTRACT FROM AUTHOR]