Issues and Trends in Public Fish Hatchery Improvement Projects
There continues to be a trend in public fish hatcheries toward more intensification and control of rearing systems by application of a variety process water treatment technologies that include dissolved gas management, screening and filtration, disinfection and temperature management. Public hatcheries are employing indoor recirculating aquaculture system (RAS) technology to provide improved environmental control, water conservation, pollution control and energy reduction. Facility improvement projects also include the use of modern communication and computer systems that provide process monitoring, alarm, and control functions. Specialized systems that provide automated feeding, grading, harvest and tagging of propagated aquatic animals are commonly included. Extensive pond production systems have evolved over time include improved harvest / water control structures, membrane liners, modern aeration and mixing systems, water quality monitoring, predator exclusion, water reuse and effluent discharge treatment.
The case histories presented provide insight into the issues impacting the modernization of public fish hatcheries and the challenges of meeting the vital role that these facilities play in the management of aquatic resources.