Summary Length–weight relationship (LWR) was estimated for 12 elasmobranch species; five shark species, four species of rays and three species of guitar fishes from north‐eastern Arabian Sea, India. Five major landing centres of Maharashtra were selected; Satpati (Lat. 19°43′15″N, Long. 72°42′00″E), Naigaon (Lat. 19°19′32″N, Long. 72°48′54″E), Versova (Lat. 19°08′33″N, Long. 72°48′11″E), New ferry Wharf (Lat. 18°57′29″N Long. 72°51′01″E) and Sassoon dock (Lat. 18°54′42″N, Long. 72°49′33″E). Samples were collected fortnightly during August 2016 to October 2017 from various gears; drift gill nets (Hung length 114–143 m and #100–270 mm) off Satpati coast at 35–50 m depth, dol nets (length 50–65 m and cod end # 30–69 mm) in Naigaon at 38–50 m depth and trawl (length 33–72 m and cod end # 17–32 mm) in Versova, New ferry Wharf and Sassoon dock operated at 20–50 m depth. Multiday fishing was carried out with 2–3 fishing trips in a month, each trip with duration of 7–13 days. Soaking time of gill net and dol net varied from 4 to 8 hr while each trawl haul lasted for 3–4 hr. Length–weight/Disc‐width‐weight relationship showed good fit with r2 values varying from 0.818 to 0.999. In addition to information on LWR, new maximum size for three species of elasmobranchs is reported in this paper.
A study was conducted on plankton dynamics of Kanke reservoir in relation to selected physico chemicalparameters from 10 September 2020 to 10 July 2021. Total ten sampling stations were chosen based onwater characteristics. Overall water quality parameters (Temperature, DO, CO2, TH, TA, Nitrate, Phosphateand pH) were found in the limits suggested for aquaculture practices except few station like STN 1, 4, and5 shown poor water quality, this may be due to domestic sewage and organic matter load released fromlocal communities. In the present study, total 50 genera of phytoplankton were identified. Of which 24genera of Chlorophyceae, 12 genera of Bacillariophyceae, 11 genera of Cyanophyceae, 2 genera ofEuglenophyceae and 1 genera of Dinophyceae. The phytoplankton abundance shows sharp increase fromJanuary to April (pre-monsoon) with Chlorophyceae as the most dominant group and Euglenophyceae asthe least dominant. Similarly, total 13 genera of zooplankton were identified. It included 6 genera of Rotifers,4 genera of Cladocerans and 3 genera of Copepods. A positive correlation was noticed between temperatureand phytoplankton in the Kanke reservoir. All group of zooplankton showed very lowabundance duringmonsoon, however, there was an increase in abundance during pre-monsoon, and highestabundance value was recorded during post-monsoon months. Findings of the present study shows that the waterquality of Kanke reservoir is still safe for aquaculture practices except few stations. But the sign ofdeteriorating water quality is started to appear as algal scam/bloom formation. The findings of this studywill serve as a baseline data for further investigations, comparing the future changes in this reservoir andto conserve this ecosystem.
Fish and seafoods are a highly perishable product due to the biochemical composition and the high microbial load on the skin and gills of fish. The natural microflora that is more adopted to low temperatures results in lower thermal bacterial shock at the storage temperature. The development of new fish processing techniques is required because the demand for fish or seafood with minimum changes in sensory Biochemical and nutritional quality. This has led to the advent of hurdle technology in the field of seafood technology. Hurdle technology is the combined use of several preservation methods to make a product shelf-stable, to improve quality and to provide additional safety. This technology is used in many countries of the world, including India. The factors used for food preservation is called as hurdles. A combination of hurdle such as high temperature, refrigeration, irradiation, drying and smoking etc. are applied to eliminate the growth of microorganism. The application of several hurdle may reduce the rate of fish spoilage caused by spoilage microbe. The objective of this book chapters is focus on the preservative effect of hurdles technology on the quality and shelf-life fish and fishery products with recent, combined updated information.
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