Fish Hatchery Production Handbook Theatre

Jessore district in southwestern Bangladesh is an important source of fish seed in the country. However, hatcheries here have high mortality rates due the quality of the water being pumped from underground reserves.

With a view to improve production of inland fisheries, the fisheries department has set a target to hatch 14 lakh fishes during 2015-16 in the fish ponds maintained at the Chittar and Pechiparai dams.

Oxygen concentration in this water, which is used in brood and nursery ponds and incubation jars, is very low, while the levels of dissolved carbon dioxide are high. This is an unfavorable combination that leads to very low survival rates of hatchlings, even from the best quality eggs and resultant economic losses. However, owners were unaware that their hatcheries faced this critical problem. In 2011, WorldFish launched the Aquaculture for Income and Nutrition (AIN) project in the southern region of Bangladesh with the financial support of USAID. The focus of this project is to promote new technologies to address problems associated with aquaculture production and nutrition in the region. Specialists on the project identified poor water quality as the most crucial problem, among others, while assessing the baseline situation in the fish hatcheries. 'This technology has radically changed our fish seed production and profitability scenario.'

- Firroj Khan, President of Jessore Fish Hatchery Owners Association The project supported installation of aeration towers to provide additional oxygen to the water. These towers are made of locally available materials and cost $USD300 a piece, which is easily affordable by the hatchery owners. A simple technique is employed –water flows through four to six layers of perforated galvanized sheets before passing to incubation jars and nursing tanks. This simple process increases the oxygen level from 3 to 8 mg per liter. The increase in oxygen levels boosts hatching rates to 95 percent.

Firroj Khan, President of Jessore Fish Hatchery Owners Association, has championed the technology from the beginning of the project. Cast software vs sonar cakewalk torrent. “We have lived with this problem for more than 30 years without knowing such a simple solution exists.

This technology has radically changed our fish seed production and profitability scenario,” he said. Fish hatchery owners who adopted the technology have now doubled the amount of fish seed they produce by comparison with the pre-intervention period of the project.

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Description Gary A. Wedemeyer, editor 751 pages Published by American Fisheries Society, January 2002 Summary This second edition expands and updates the original Fish Hatchery Management, the pre-eminent fish culture manual in North America since 1982, which has been used in universities and USFWS training centers nationwide to train new generations of culturists. The new edition has been completely rewritten by experts to include major advances in hatchery operation, in practical knowledge about raising high-quality fish, and in optimal use of cultured fishes in management programs. This up-to-date volume is greatly needed as a training tool and day-to-day hatchery resource. Like the first edition, the book includes a great deal of information about particular species, but its focus remains on the requirements and practical operation of culture systems. The new edition covers advances in production, water issues, transportation, stocking, open systems, controlled systems, semi-controlled systems, broodstocks and spawning, nutrition and and feeding, fish health, and special considerations. Authors have developed chapters for relevance to both private and public fish culture.

Table of Contents List of Species Preface Symbols and Abbreviations History and Purpose of Fish Culture (Robert R. Stickney) Production (Harry Westers) Hatchery Water Supply and Treatment (John E.

Colt and Joseph R. Tomasso) Open Systems: the Culture of Fish for Release into Natural Systems (William Pennell, E. Lane, and Frank Dalziel) Semicontrolled Systems (Patricia M. Mazik and Nick C. Parker) Controlled Systems: Water Reuse and Recirculation (Steven Summerfelt, Julie Bebak-Williams, and Scott Tsukuda) Broodstock Management for Imperiled and Other Fishes (J.