Stock structure analysis of Nemipterus bipunctatus (Valenciennes, 1830) from three locations along the Indian coast

1888-1895Present study was done to identify the occurrence of various stocks of Nemipterus bipunctatus along the Indian coast, based on their body and skull shape morphometrics. Fish samples were collected from three locations along the Indian coast viz. Chennai along the East coast and Mumbai and Veraval on the West coast. Twenty truss distances from nine-point truss network of body and twenty-one truss distances from eleven-point truss network of the skull were measured from each fish sample. The canonical discriminant analysis showed that the truss distances belong to the anterior region and caudal peduncle of body and olfactory region of skull were significant in separating the fish stocks. The artificial neural network analysis revealed 91.4 % and 86.14 % well classification of the specimen, based on the truss distances of body and skull respectively. The results from the study indicated that there is a significant difference among the stocks of N. bipunctatus

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Not AvailablePresent study was done to identify the occurrence of various stocks of Nemipterus bipunctatus along the Indian coast, based on their body and skull shape morphometrics. Fish samples were collected from three locations along the Indian coast viz. Chennai along the East coast and Mumbai and Veraval on the West coast. Twenty truss distances from nine-point truss network of body and twenty-one truss distances from eleven-point truss network of the skull were measured from each fish sample. The canonical discriminant analysis showed that the truss distances belong to the anterior region and caudal peduncle of body and olfactory region of skull were significant in separating the fish stocks. The artificial neural network analysis revealed 91.4 per cent and 86.14 per cent well classification of the specimen, based on the truss distances of body and skull respectively. The results from the study indicated that there is a significant difference among the stocks of N. bipunctatus.Not Availabl

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Not AvailableEutrophication level in lakes and reservoirs depends on both internal and external phosphorus (P) load. Characterization of sediment P fractionation and identifying the P pollution sources are important for assessing the bio - availability of P and the dominant P source, for effectively controlling the water pollution. For determining the availability and sources of sediment P and eutrophication status, spatio - temporal variation in different P fractionation of sediment of hyper - eutrophic Krishnagiri reservoir, Tamil Nadu, India, was investigated. Sediment average total P (TP) content ranged from 4.62 to 5.64 g/kg. Main phosphorus form was the inorganic P (IP), and it makes up to 73.4–87.7% of TP. Among the different P fraction, viz. calcium bound (Ca - P), iron bound (Fe– P), aluminium bound (Al - P), exchangeable (Ex - P) and Organic - P (Org - P), Ca - P was the dominating fraction in both IP and TP. Trend of IP fraction was as follows: Ca - P[Fe–P][Al - P][Ex - P] in pre - monsoon season, Fe–P[Ca - P][Al - P][Ex - P] in monsoon and Ca - P[Al - P][Fe–P][Ex - P] in post - monsoon. Overall the trend was as follows Ca - P[Fe–P][Al - P][Org - P][Ex - P]. Bio - available - P (BAP) fractions ranged from 35.2 to 64.0% of TP, indicating its comparative higher value. Pearson’s correlation matrix revealed that there was strong correlation among the different P fractions. Factor analysis indicates that different fractions of P were the dominating factor than the other sediment parameters. The observed variation in sediment P fractionation indicate the differences in source and characterization of P which is very helpful for implementation of effective management practices in controlling pollution that arises due to phosphorus in this hyper - eutrophic reservoir.Not Availabl

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Not AvailableLength-weight relationship (LWR) of five species of the genus Labeo (Family: Cyprinidae) namely L. rohita (Hamilton, 1822), L. calbasu (Hamilton,1822), L. bata (Hamilton,1822), L. dyocheilus (McClelland, 1839) and L. porcellus (Heckel, 1844), based on 214 specimens collected from Cauvery River in Peninsular India, were established. Sampling was carried out from December 2017 to December 2018 at around three months interval. The value of regression coefficient (b) ranged from 2.6147 (L. bata) to 3.2855 (L. dyocheilus). A new maximum length of 41 cm for L. porcellus has been recorded. For L. porcellus, LWR is established for the first time while for other species (except L. rohita); it is estimated for the first time from a peninsular river in India. Relative condition factor estimated for the five fish species did not show large scale variation (1.001 to 1.019).Not Availabl

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Not AvailableThe fisheries sector plays a vital role in the food, nutritional and livelihood security of people, especially in the rural regions of India. Reservoirs, the man made impoundments built on rivers/ streams obstructing the surface flow, form an important resource for the fish production besides holding up economic growth through various cultural and ecological services. India has enormous reservoir resources to the tune of 3.42 million ha (19,386 numbers). The distribution of reservoirs is quite uneven and most of the reservoirs are located in the southern and central Indian states. In the last few decades, India has made tremendous progress in reservoir fisheries and overall management strategies have been considerably innovated. The average annual fish productivity realized from reservoirs was very low (small: 49.9, medium: 12.3 and large: 11.4 kg ha¡1 yr¡1 ) against the annual potential yield of 100, 75, and 50 kg ha¡1 yr¡1 . The fish yield from Indian reservoirs has enhanced through fingerling stocking and adoption of improved management practices and the average productivity increased to 33, 94, and 174 kg ha¡1 yr¡1 from large, medium, and small reservoirs respectively. The production potential has been re-casted to a level of 100, 200, and 500 kg ha¡1 yr¡1 from large, medium and small reservoirs, respectively. The increase in fish productivity is about one third of the present production potential and there exists scope for developing effective and sustainable strategies for further enhancing the fish yield. The present review synthesizes the updated information available on Indian reservoirs and the developments during the last decade with reference to fisheries, biodiversity, potential, threats, and recommends strategies for sustainable management of the reservoir fisheries in India.ICA