2, rainbow trout: rainbow trout is also a kind of fish that feeds on insects, and black gadfly can be one of its feeds. Rainbow trout is a kind of high-grade farmed fish with high price and relatively large farming profit.
3, salmon: salmon also belongs to the insect-feeding fish, black gadfly can be used as one of its feed. Salmon is a kind of high-protein and high-nutrition edible fish, with large market demand and relatively high farming profit.
4, carp: carp is an omnivorous fish, can eat insects and other zooplankton. Black gadfly can be used as one of its feeds, and the breeding of carp can also get some profit.