At the aquarium he instituted experiments on the migration of smelts, the habits of the herring, whitebait, crayfish, and other topics.
en.wikipedia.org However, when water levels are lower, crayfish will seek out shelter while fish become more highly concentrated and susceptible to predation.
en.wikipedia.org Prey items eaten by quolls include insects, crayfish, lizards, snakes, birds, domestic poultry, small mammals, platypus, rabbits, arboreal possums, pademelons, small wallabies, and wombats.
en.wikipedia.org Fishing has continued to be the lifeblood of the town with substantial quantities of crayfish, abalone, scallops and trevally.
en.wikipedia.org