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Not AvailableThe canal systems in Indian Sundarbans, West Bengal cover 907.33 ha area and offers a huge resources for fisheries development and livelihood. Naturally, fish enter to these canals from the source waters and form natural populations. Despite having vast resources, a little attention is paid to boost Inland fish production from canals. To understand the ecology and development of suitable practices/ techniques in canal systems, an effort was made for the sustainable fish production. Bharua canal a tidal fed canal connected with river Hooghly at Shibpur, Fraserganj of Sundarbans was selected to enhance fish production. The total length of canal is 2 km, average width of 45 m and water depth ranged from 3 to 8 feet. Three numbers of net partition system (NPS) were constructed with dimension of 50m × 45m covering an area of 2,250 m2 each partition system. Water temperature (27.50±0.49°C), transparency (27.71±2.10 cm), Dissolved oxygen (5.61±0.13mgL- 1), pH (7.68±0.04), salinity (2.28±0.11gL-1) were recorded during the trial. Diatoms (Bacillariophyceae) were dominated across the seasons. The quantitative abundance of phytoplankton and Zooplankton in the canal was 9522±2170 cellsl-1 and1918±97ind/l respectively. Rotifera shared dominance (45%) followed by crustacean nauplii (20%) and cladocera (12%). A total of 16 species of fish under 7 orders and 10 families were recorded. With the native fishes, fingerlings of Indian Major Carps Labeo catla, Labeo rohita and exotic carp Ctenopharyngodon idella were stocked @2 nos./m2 in a ratio of 50: 40: 10 in a net partition system (NPS) installed in the canal. After a culture period of 180 days, the average size recorded for Labeo catla, Labeo rohita and Ctenopharyngodon idella were 265.61 ± 25.44 g, 184.63 ± 26.13 g and 221.57 ± 21.94g respectively. In addition to stocked fishes, considerable quantity of small indigenous fish (SIF’S) like Puntius sophore, Puntius ticto, Amblypharngyodon mola, Salmostomo bacaila were caught from NPS. In the present study, culture of fish in NPS showed feasible option in the canal. Hence, the NPS can be look upon as a potential culture practice to enhance the fish production and productivity from the unutilized canal resources. Adoption of this culture practice will provide a nutritional security, generate employment opportunity, and improve the livelihood and socioeconomic status of the rural populace of Indian Sundarbans.Not Availabl

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Not AvailablePresent study provides length–weight relationships (LWRs) and length–length relationships (LLRs) of eight fish species from river Ganga, India. Specimens were sampled from gill nets (mesh, 22–120 mm), cast nets (mesh, 12–14 mm), and seine nets (mesh, 12 mm) on quarterly basis from September 2016 to September 2017 within the river stretch from Buxar (25°33′43.90″N and 83°56′3.10″E) to Freserganj (21°35′40.58″N and 88°15′28.92″E). The b value ranged from 2.86 (Otolithoides pama) to 3.08 (Polynemus paradiseus), whereas a value ranged from 0.004 (P. paradiseus) to 0.016 (Rita rita). Both relationships (LWRs and LLRs) were found to be highly correlated (p < .001). This study provides first report on LWR for Amblyceps mangois and Osteobrama cotio, whereas new maximum length recorded for Macrognathus pancalus. Furthermore, the estimate of R. rita should be considered as tentative because of the limited size range in the studyNot Availabl

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Not AvailableA 90 days trial was carried out to investigate the impact of stocking density on growth performances and the health status of Puntius sarana in inland open water cages (Salia Dam of Odisha, India). The fishes of mean body weight 32.04 ± 1.25 g were stocked @ three stocking densities (SD) i.e., 10 m 3 (SD10), 20 m 3 (SD20), and 30 m 3 (SD30) and fed with commercial feed of 28% protein and 4% fat. The growth, in terms of weight gain, specific growth rate, absolute growth rate, percentage survival, protein efficiency ratio, and feed conversion efficiency was significantly decreased (P < 0.05) with increment in stocking density, however the lowest feed conversion ratio (FCR) was obtained in SD10 (1.68 ± 0.02). At the end of the experiment, a significant increase in red blood cells, haemoglobin, haematocrit, and platelets level was found in SD30, while white blood cells were showed a reverse trend. The concentration of superoxide dismutase, catalase, serum glucose, serum glutamic oxaloacetic transaminase (SGOT), serum glutamic pyruvic transaminase (SGPT), and cortisol were increased significantly in SD30. On contrary, the level of serum triiodothyronine and thyroxine decreased with an increase in stocking density. The higher stocking density negatively affected the amylase activity without any adverse impact on protease and lipase. The cluster analysis revealed that SD20 and SD30 came under the same dendrogram while SD10 formed a separate one. The outcome of PCA (Principal Component Analysis) revealed that increased levels of SGPT, SGOT, glucose, and cortisol negatively influenced the growth attributes. Stocking density up to 20 fingerlings m 3 of P. sarana in inland open water cages performed ideally in terms of growth and health status of fish.Not Availabl

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Not AvailableLength‐weight relationships (LWRs) for five indigenous fish species under five genera and two families, namely Cyprinion semiplotum (McClelland, 1839), Barilius barna (Hamilton, 1822), Barilius barila (Hamilton, 1822), Gagata sexualis Tilak, 1970 and Pseudolaguvia shawi (Hora, 1921) were studied from Torsa River in West Bengal, India. Sampling was done at quarterly intervals from November, 2015 to December, 2016 and a total of 701 fish specimens were collected using cast nets (mesh size of 15–20 mm), gill nets (mesh size 20–35 mm) and bamboo traps. In the present study, b value ranges from 2.686 to 3.268. LWRs for these fish species (except P. shawi) have not been reported in FishBase. A new maximum length has been recorded for P. Shawi and G. sexualis. The relative condition factor (Kn) values was found to range from 1.004 to 1.028.Not Availabl

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Not AvailableThe aim of this study was to understand the ecohydrological interactions of periphyton assemblages in a canal (Bishalakhi) located in the Indian Sundarban. Sixteen environmental variables and periphyton (scrapped from a known area of submerged natural substrates) were collected seasonally (pre-monsoon, monsoon, and post-monsoon) from three sampling stations between July 2017 and September 2018. Data was analyzed to determine periphyton diversity, abundance, spatiotemporal dynamics, and their relationship with environmental variables using R-software. Eleven environmental variables (water temperature, water depth, water velocity, specific conductivity, total alkalinity, salinity, Mg2+, PO4−P, TP, SiO4−Si, and transparency) showed significant difference (p CCA2 (0.93) > CCA3 (0.93). The majority of the diatom (36 species) had a strong affinity with dissolved oxygen and total nitrogen. The water velocity and specific conductivity were found to influence the distribution of species (Phormidium sp., Ankistrodesmus falcatus, Diploneis sp., Synedra sp., Eunotia sp., and Nitzschia recta) in the canal environment. The results of this study advance the current understanding of the relationship between periphyton and its environment and may aid for better planning of periphytonbased aquaculture in the semilotic canals of Indian Sundarbans.Not Availabl