Rearing Larval Fish
Fish Dave has stated that it is uneconomic to rear larval fish in the country of origin for export to the aquarium trade (based on his work in the Solomons). I don't believe that this is the case in the Philippines. I had the opportunity to visit the hatchery/rearing facility that Ferdinand Cruz has created in the Province of Bicol, PI last November.
Ferdinand has chosen his site carefully. The site is situated on the Albay Gulf. The waters are rich in plankton. Ferdinand has biologists using light traps and channel nets to capture larval fish. They also use plankton nets to gather zooplankton for feeding larval fishes. The facility pumps water from the Gulf through a series of raceways. Ferdinand stated they could gather large numbers of larval fishes off of relatively few coral heads after the fish had settled. Hence, he believes it is possible to gather large numbers of the species of interest to the aquarium trade, if one knows when and where they recruit and settle to the bottom.
Feeding the larvae is economic since they are being largely provided with the foods the fish would eat naturally in the local marine ecosystem. From what I know, this is still how most larval fishes get reared. For example, dwarf angelfish were reared in Hawaii with copepods captured from the wild, since no one has yet developed a method for closing the life cycle to allow copepods to be reared from eggs.
It is cheaper to have Filipinos trained in marine biology doing the work of gathering the plankton and feeding the fishes in a hatchery situated in the Philippines, than to have the work done in western countries (such as the USA) where staff wages are higher. The aquaculture facility is also cheaper to create and maintain in PI, than in Hawaii, Florida, or Puerto Rico.
Ferdinand and Dr. Ralph Turingan are now working with the aquarium fish collectors, and training them how to rear the fishes in floating cages. Once, the fish have transformed from post-larvae to small juveniles, they can be transferred to the floating cages. The collectors are being trained to feed the juvenile fishes for grow out to the sizes needed for export. While, it is still too soon to determine the economics of these efforts, I am optimistic that rearing fishes in this way for export
can be very competetive on the world market.
Peter Rubec