611 Environment and Ecology 37 (2) : 611—615, April—June 2019 Website: environmentandecology.com ISSN 0970-0420 Characterization of Fish Glue from Croaker Wastes N. K. Chandravanshi, S. Chowdhury, S. Nath Received 23 December 2018 ; Accepted 25 January 2019 ; Published on 15 February 2019 Abstract Croaker fsh (Johnius belangerii), one of the important landed species in West Bengal, contains 75% post-flleting waste of the weight of the total catch. About 2–5% of the processing waste of croaker consists of skin and swim bladder with high collagen content is excellent raw material for the preparations of natural and organic adhesive fsh glue with attractive color, appealing favor, aesthetic appearance and longer storage life due to lowered pH. Fish glue is known as value added product from fsh processing by products as the adhesive agent. Thus, the objective of the study was to determine the volume of the wastes generated from croaker and to assess the suitability of different wastes parts (skin and swim bladder) for manufacturing fsh glue in India. Moisture content of glue from fsh skin and swim bladder were found to be 36.73±0.34% and 36.24 ± 0.90% respectively implies that, there is a signifcant (p < 0.01) positive correlation between raw material moisture and glue pH (0.926). The protein content of glue from croaker skin and swim bladder were found to be 55.32 ± 0.86% and 51.19 ± 0.51% implies that, there is a signifcant (p < 0.01) positive correlation between raw material protein and raw material ash (0.943). Lipid content was less in skin and swim bladder glue samples (1.70 ± 0.021% and 3.52 ± 0.05% respectively), which may be due to the soaking bath treatment of raw materials in 0.2% NaOH which helped the fber bundle to open and subsequently removed the connective lipid. The glue yield from coraker skin was higher (25.742%) than to that of swim bladder (19%). So, in near future, there is a great potential for development croaker fsh glue, the by product of fsh skin and swim bladder, which will certainly put this fsh species into suitable and proftable use, increasing the income of the farmers, creating employment opportunities and strengthen rural economy. Keywords Croaker waste, Fish glue, Fish skin glue, Swim bladder glue. Introduction India is belonging as one of the top fsh producing countries in the world. The fourishing fsheries con- tribute one of the lion shares in Indian agriculture with its varied resources and potentials having great economic importance (Sajesh and Suresh 2016). Globally, capture fshery is based on the catching or trapping of fsh from marine, brackish or freshwater resources among which about one-third of the catch is used for production of fshery by-products (Shumaker 2012). The post-flleting waste from fsh processing can account for as much as 75% of the weight of the total catch (Shahidi 1994). About 2–5% of such waste consists of skin and swim bladder with high collagen content which is excellent raw material for the preparations of glue. One of the important species in India, croaker (Johnius belangerii), whose production in the fscal N. K. Chandravanshi*, S. Chowdhury Department of Fish Processing Technology, Faculty of Fishery Sciences, West Bengal University of Animal and Fishery Sciences, Kolkata, India S. Nath Department of Fish Processing Technology, College of Fisheries Science, Birsa Agricultural University, Ranchi, India e-mail: chandravanshinilesh2@gmail.com *Corresponding author