Browsing by Author "Jawahar, P"
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OtherItem Open Access Biodiversity and Conservation of Commercially Important Crustacean Resources of Tamil Nadu Coast(TANUVAS, 2006-06) Venkataramani, V.K.; Jayakumar, N; Jawahar, PThesisItem Open Access Developing Multimedia Extension Module to Educate the Fishermen on Conservation of Biodiversity of Gulf of Manner Biosphere Reserve(TANUVAS, 2009) Sivaraman, I; TANUVAS; Sujathkumar, N.V.; Santhakumar, R; Jawahar, PThesisItem Open Access FISH DIVERSITY AND PRODUCTIVITY OF SELECTED RESERVOIRS OF SOUTHERN TAMIL NADU(Fisheries College and Research Institute, Thoothukudi, Tamil Nadu Fisheries University, 2017-08-28) MOGALEKAR HAVAGIAPPA SHARNAPPA; Jawahar, P; Srinivasan, A; Karal Marx, K; Sujathkumar, N.VThe present investigation was conducted to study hydro-biological parameters, zooplankton diversity, fish diversity and productivity in Manimuthar, Vaigai and Kullursandai reservoirs from December, 2014 to November, 2016. The water quality parameters were recorded for all three reservoirs and the water temperature ranged from 27.8±0.3 to 29.7±0.4 oC, transparency from 15.3±0.4 to 92.4±6.1 cm, total dissolved solids from 10.2±0.7 to 33.9±2.1 mg/l, pH from 7.1±0.1 to 7.7±0.1, dissolved oxygen from 5.8±0.1 to 6.7±0.2 mg/l, total alkalinity from 44.4±1.3 to 170.9±4.9 mg/l, total hardness from 28.9±0.9 to 66.6±1.9 mg/l, nitrate from 0.8±0.1 to 1.0±0.2 µg at NO3-N/l, phosphate from 0.2±0.0 to 0.8±0.1 µg at PO4-P/l and chlorophyll ‘a’ from 11.3±0.3 to 192.6±4.8 mg/m3. The average water quality during study period indicated that these three reservoirs were ideal for fisheries productivity. In present study, 29 species of zooplankton representing two phyla, four classes, five orders, eight families and 18 genera were recorded from these reservoirs. Zooplankton diversity indices were calculated for Margalef’s species richness (1.12 to 1.2), Pielou’s evenness (0.99 to 1) and Shannon-Wiener species diversity (2.31 to 2.32). The results indicated moderate zooplankton diversity in these reservoirs. The present investigation discovered presence of 66 species of fishes under eight orders, 19 families and 40 genera. The highest number of fishes were recorded in Manimuthar (62 species) followed by Vaigai (44 species) Kullursandai (15 species). The order with diverse species composition was Cypriniformes (33 species). Cyprinidae was the most diverse family with 32 species. Of the 66 fishes, 59 species were supporting capture fishery, 40 species could possibly support ornamental fishery and 18 species could be used for capture based culture fishery. The indigenous fishes Dawkinsia arulius, D. tambraparniei, D. rohani and Hypselobarbus curmuca are recorded as threatened and need conservation initiatives. The ranges of fish diversity indices calculated during study period were Shannon-Wiener species diversity (3.67 to 5.58), Margalef’s species richness (3.2 to 11.06), Pielou’s evenness (0.94 to 0.96), Average taxonomic distinctness (84.43 to 86.38) and Total phylogenetic diversity (782.4 to 3,100). The calculated ranges of fish diversity indices indicated healthy nature of ecosystem with rich species diversity in descending order from Manimuthar > Vaigai > Kullursandai. The results of trophic state index (TSI) indicated that the Manimuthar as mesotrophic reservoir, Vaigai as eutrophic and Kullursandai as mid-eutrophic. The highest value of the morpho-edaphic index (MEI) was recorded in Kullursandai (11.93±0.72/year) followed by Vaigai (3.57±0.10/year) and Manimuthar (0.61±0.04/year). The potential fish yield was predicted for Manimuthar as 2.74±0.08 kg/ha/year, Vaigai as 6.29±0.08 kg/ha/year and Kullursandai as 10.96±0.33 kg/ha/year. The average potential fish yield was 10.76 kg/ha/year in Manimuthar, 47.18 kg/ha/year in Vaigai and 440.75 kg/ha/year in Kullursandai. The mean value of the fish production during the last ten years from Manimuthar was 8,646 kg/year, Vaigai was 29,557.10 kg/year and Kullursandai was 48,534 kg/year. The catch per unit effort (CPUE) observed during study period was 10 kg/coracle/day in Manimuthar, 4 kg/coracle/day in Vaigai and 122 kg/coracle/day in Kullursandai. The Cytochrome C Oxidase subunit I gene (COI) sequence of Anguilla bengalensis (Gray, 1831) and Xenentodon cancila (Hamilton, 1822) were generated. Considering all the hydro-biological parameters, zooplankton and fish diversity, TSI, MEI, predicted potential fish yield and CPUE of studied reservoirs reflected Kullursandai as the most productive reservoir followed by Vaigai and Manimuthar. To enhance the fish yield, the stocking of 40 to 150 mm sized fingerlings at the rate of 1000 fingerlings/ha in Vaigai reservoir and 2000 fingerlings/ha in Kullursandai and Manimuthar reservoirs are recommended Optimizing the use of available water area through the cage or pen culture practices is essential to augment fish yield in Vaigai and Manimuthar reservoirs.ThesisItem Open Access GENERATION OF DNA BARCODE DATABASE FOR CARDINALFISHES OF TAMIL NADU COAST(Fisheries College and Research Institute, Thoothukudi, Tamil Nadu Fisheries University, 2017) RAJESHKANNAN, R; Jaculine Pereira, J; Karal Marx, K; Jawahar, PCardinalfishes belongs to the family, Apogonidae is cryptic in nature that often shows taxonomic ambiguity through conventional taxonomy. It is globally accepted that mitochondrial DNA marker i.e., Cytochrome C Oxidase (COI) can be used to resolve these taxonomic uncertainties. In the present study, the DNA barcode was developed using COI marker for the two species of cardinalfishes (Archamia bleekeri and Ostorhinchus fleurieu) collected from Thoothukudi coast. Results showed that the distance values between the two species are higher than that of within the species. The Cytochrome C Oxidase subunit I (COI) gene showed more number of transitional pairs (Si) than transversional pairs (Sv) with a ratio of 2.4. The average distance values between A. bleekeri and O. fleurieu were 7.39, 8.14, 7.18 and distance values among the A. bleekeri and O. fleurieu were 4.83 and 4.24, 7.42, 3.72 respectively using K2P parameter. The average nucleotide frequency calculated were A= 26.9%, T(U)= 24.3%, C= 21.95% and G= 26.8%. The estimated GC content of A. bleekeri and O. fleurieu was (49.9%) and (47.6%) respectively and the average GC content was found to be 48.75%. Phylogenic trees were constructed individually for the two species using MEGA 6.0 software and the Neighbour-Joining tree showed distinct clusters shared by the species of same genera. In conclusion, the present study developed DNA barcode database for the two species of cardinal fishes that can be used for taxonomic purposes for these species.ThesisItem Open Access Nutrient Removal from Different Wastewaters Using Micro and Macro Algae(TANUVAS, 2011) Selvarani, Juliet; TANUVAS; Padmavathy, P; Srinivasan, A; Jawahar, PThesisItem Open Access Protein Characterization of Chaetodontid Fishes of Thoothukudi Coast(TANUVAS, 2010) Arya, P; TANUVAS; Rajagopalsamy, C.B.T.; Marx, K. Karal; Jawahar, PThesisItem Open Access STUDIES ON BIOLOGY AND STOCK ASSESSMENT OF ANCHOVIES LANDED AT THOOTHUKUDI COAST(Fisheries College and Research Institute, Thoothukudi, Tamil Nadu Fisheries University, 2017) PATADIYA DHAVAL SURESHBHAI; Jawahar, P; Jayakumar, N; Jaculine Pereira, JThe present investigation was carried out to study the landings, biology and stock assessment of selected species of anchovies along the Thoothukudi coast. A total of nine species belong to the genera Encrasicholina (one), Stolephorus (three) and Thryssa (five) were recorded from this coast during the study. Stolephorus indicus was dominant in the catch. The landing was high during the months of June to September. The highest length recorded for S. indicus was 15.3 cm total length (TL) whereas for T. setirostris, it was 14.5 cm TL. The length weight relationship studies revealed that both S. indicus and T. setirostris exhibited a negative allometric growth with the slope values of 2.7273 and 2.8801, respectively. The food and feeding habit studies indicated that both the species were zooplanktivorous. The index of preponderance revealed that the copepods were the major food item in the stomach of S indicus and the small sized prawns were dominant in T. setirostris. The sex ratio of male and female of S. indicus was 1: 0.9 and for T. setirostris the ratio was 1:1. The length at first maturity was observed to be 11.2 cm for S. indicus and 11.5 cm for T. setirostris. Fecundity of S. indicus was 970 to 6084 eggs in fish measuring 11.5 to 15.3 cm and for T. setirostris it was 3,057 to 16,395 eggs in fish measuring 11.4 to 13.9 cm. The von Bertalanffy growth parameters, asymptotic length (L∞), growth coefficient (K) and age at zero length (t0) for S. indicus were 16.07 cm and 2.1 per year and -0.0874 years respectively. Similarly for T. setirostris these values were 15.02 cm, 1.4 per year and -0.1365 years respectively. The total instantaneous mortality co-efficient (Z) of S. indicus and T. setirostris was 6.67 and 4.60 and natural mortality (M) was 3.54 and 2.77 respectively. The fishing mortality was relatively lower than the natural mortality and it was estimated as 3.13 for S. indicus and 1.83 for T. setirostris. The present exploitation rates were 0.47 (S. indicus) and 0.40 (T. setirostris), which indicates that these two species were under exploited along the coast. Virtual Population analysis of these two species revealed variation in the mortality levels at different length groups. The natural mortality was high in the length group less than 11 cm for both species. The present result indicates that both the species were under exploited and current catch was lesser than the estimated MSY. From the study, it could be established that, the present fishing effort could be increased up to 5 % in terms of boat days to sustainably exploit these two resources.