Intensive Recirculating Aquaculture Facility at the Hackettsto
نویسنده
چکیده
A recirculating aquaculture system was developed to hold native fishes for experimental pumping trails at the U.S. Bureau of Reclamation’s Tracy Fish Collection Facility (TFCF), Sacramento-San Joaquin Delta, California. The TFCF operates to prevent the entrainment of juvenile and adult fishes, including endangered species, into the Delta Mendota Canal. TFCF uses louvers to direct into the collection facility where they are held in tanks, identified, measured, and then transported and stocked at selected sites into Delta daily. A high diversity (52 species) and large numbers (2-23 million) fish are salvaged annually from over 2.5 billion cubic meters of water exported to the canal. From these wild fish, the Sacramento splittail (Pogonichthys macrolepidotus) a threatened species, was selected and held in the recirculation system for 6 months prior to pumping trials. The recirculation system consisted of two sets of six tanks (235 gal/tank) each set with a biofilter, swirl separator, ultraviolet filter, and oxygen injection. After six months, splittail were randomly assigned to control or treatment groups and used to examine the efficacy of an experimental fish-friendly. Fish in the control group were used to characterize overall effects of the recirculating aquaculture system. Wild splittail exhibited rapid acclimation to the system and artificial feed, fast growth, high survival (>95%), and good condition (minimal scale loss, abrasion, and abnormalities to skin, eyes, head, and fins). Experimental fish were used to examine the effect of a Hidrostal pump to move large volumes of water and a diversity of fish species and sizes. At optimum discharge and velocity, fish mortality, descaling, and injury rates were minimal after pump passage.
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