. Commercial fisheries review. Fisheries; Fish trade. 62 Wholesale value of both species that year amountedto $ million (Lyles, 1967). Blood worms wholesale for about $ per pound (100 worms), and clam worms sell for about 60 centsper pound (50 worms). On the retail marketj however, blood worms sell for as much as $3 per pound, and clam worms bring about $ At these prices, marine bait worms are one of the most valuable products from the sea (Dow, 1964; Hawking s, 1966; Dow and Wallace, 1967). Pope (1961) suggested that the culture of marine worms would have many advantages over digg
. Commercial fisheries review. Fisheries; Fish trade. 62 Wholesale value of both species that year amountedto $ million (Lyles, 1967). Blood worms wholesale for about $ per pound (100 worms), and clam worms sell for about 60 centsper pound (50 worms). On the retail marketj however, blood worms sell for as much as $3 per pound, and clam worms bring about $ At these prices, marine bait worms are one of the most valuable products from the sea (Dow, 1964; Hawking s, 1966; Dow and Wallace, 1967). Pope (1961) suggested that the culture of marine worms would have many advantages over digging them from tidal flats. It would be necessary to develop techniques to make sea worm farming as profitable as the high- ly successful practice of growing earthworms as a bait for freshwater fishes. A number of problems, however, face the prospective sea worm farmer. PROBLEMS OF SEA WORM AQUICULTURE The main difficulty in rearing sea worms is the procurement of enough young worms for farm stock. Blood and clam worms, like most other marine worms, spawn in the open sea where their young are dispersed by tides and currents. The problem is amplified be- cause the juvenile worms require a special diet of plankton that would be difficult to fur- nish even if they could be obtained by induced spawning under artificial conditions, or by other means. Other factors that prospective growers would need to consider include choice of a seawater system (Clark and Clark, 1964; Parisot, 1967; Fuss and Kelly, in press), site location, capital investment, operating costs, marketing channels and, of course, potential profit. THE LUGWORM-- A BAIT WORM FOR AQUICULTURE The lugworm, Arenicola cristata, is good bait for a number of fishes. It has biological characteristics that make it better suited for aquiculture than blood and clam worms, or other sea worms that produce free -swim - ming larvae. Furthermore, preliminary rearing experiments indicate that engineering and economic aspects of lugworm
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