World Aquacluture Magazine - September 2020

70 SEP TEMBER 2020 • WORLD AQUACULTURE • WWW.WA S.ORG Brand The Standard in Growth and Survival Augmentation AlgaMac Enrich High in DHA and Natural Astaxanthin Celebrating 37 years serving the aquaculture industry with high quality diets, Artemia cysts and hatchery equipment including the AlgaMac series algae replacement/substitution rich in DHA for shrimp, fish and bivalve applications. AlgaMac-3050 Flake 20-22% DHA! - dry wt basis in crumble flake form. AlgaMac Protein Plus All celled DHA enriched Rotifer Growout Diet AlgaMac Enhance Two whole cell algaes with amino acids, nucleic acids, vitamins and beta-glucans Series World renowned AlgaMac Other high quality feeds from Bio-Marine: EconoMac Microparticle diet: Larval-PL stages Formulated Diets (4000 series) Micro-crumble diet: Larval-PL stages Astarose Natural source of Astaxanthin Spirulina Spray-dried Algae ArteMac Artemia Replacement Replace up to 100% Artemia with this nutritionally superior diet. MadMac Maturation Stimulator Fresh, make on-site. Rich in DHA. Aeration Filtration Heating Lab Supplies Meters Tubing & Hose UV/Ozone Water Quality Microscopes Pipe/Fittings/Valves Pumps Refractometers Systems Design ... and more. Hatchery Equipment & Supplies PO Box 5, Hawthorne, California 90250 USA Tel: 310-973-5275 / Fax: 310-676-9387 If you wish to test our diets, please contact us for a sample. Red AlgaMac Rotifer & Artemia Enrichment. New www.aquafauna.com email: aquafauna@aquafauna.com Highlights • Broodfish of 80-120 g are stocked at 2-3/m 2 and fed with 33 percent protein pelleted feed at 2 percent body weight twice a day. • Injection of 0.3 mL/kg body weight of females and 0.1 mL/kg body weight of males with synthetic hormone is sufficient to induce ovulation. • Maintenance of water quality through aeration and water replenishment during larval rearing is important to reduce stress in larvae, leading to enhanced growth and survival. • Larvae can be reared at 1000-1500/m 2 for 15-20 days in indoor conditions for better growth and survival. Stocking at higher density leads to sudden mortality and reduced growth. • Tubifex paste should be provided during the initial phase of larval feeding and then gradually weaned to live tubifex and finally compound feed. This husbandry practice stimulates fry to accept feed immediately after release into nursery tanks during fingerling production, which ultimately increases growth and survival. • Segregation of bigger fry and removal of filamentous algae at periodic intervals results in greater growth and survival. Notes Swagat Ghosh, N.C. Sahu, Sasya Shyamala Krishi Vigyan Kendra (SSKVK), Ramakrishna Mission Vivekananda Educational and Research Institute (RKMVERI), Arapanch, Sonarpur, South 24 Parganas, West Bengal, India, Kolkata-700150. F. H. Rahaman, ICAR- Agricultural Technology Application Research Institute (ATARI) Kolkata,Indian Council of Agricultural Research (ICAR), Ministry of Agriculture, Government of India, Sector III, Salt Lake City, Kolkata-700097. * Corresponding author e-mail: swagotor@gmail.com References Alok, D., T. Krishnan, G.P. Talwar and L.C. Garg. 1993. Induced spawning of catfish, Heteropneustes fossilis (Bloch), using D-Lys6 salmon gonadotropin-releasing hormone analog. Aquaculture 115(1-2):159-167. Nandeesha, M.C., K.G. Rao, R. Jayanna, N.C. Parker, T.J. Varghese, P. Keshavanath and H.P.C. Shetty 1990. Induced spawning of Indian Major Carps through single application of Ovaprim C. Pages 581-585 In : Hirano, R. and L. Hanyu (Eds.) The Second Asian Fisheries Forum, Asian Fisheries Society, Manila, Philiphines. Haniffa, M.A.K. and S. Sridhar. 2002. Induced spawning of spotted murrel ( Channa punctatus ) and catfish ( Heteropneustes fossilis ) using human chorionic gonadotropin and synthetic hormone (Ovaprim). Veterinary Archives. 72:51-56.