Abstract
Abstract A recirculating-water system was designed for raising larval fish that concentrated larvae and prey while keeping them suspended in the water column and maintained good water quality during a 3–4-week rearing period. Incoming ambient seawater was tested and found free of chemicals potentially toxic to larvae, except for petroleum hydrocarbons. An external filter, consisting of activated carbon, crushed oyster shelf, and biofiltration material, reduced the petroleum hydrocarbons and maintained low levels of nitrogenous compounds throughout the larval rearing phase. Larvae of red drum (Sciaenops ocellatus), used to test the system, had a 55% survival rate, which was as high as has been achieved previously. Three species of tropical fish larvae were reared in the system. High survival of cubbyu (Equetus umbrosus) to metamorphosis (18%) and limited, but promising, success with spotfin hogfish (Bodianus pulchellus) and yellowtail snapper (Ocyurus chrysurus) demonstrate that the design can be applied to the culture of ornamental fish.
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