Any fish-farmers? Help!!! I need help!?

Question

suggest 1 harmful environmental effect and of the use of low-value fish as feed for the developing high-value fish. Also state 1 commercial advantage?

Answer 1

One harmful effect could be accidentally introducing an invasive species into the wild, depending on location and species choice. Also, I really can't see any commercial advantage of using a low value fish as feed unless you are getting those free from the wild. If so then this might also become a harmful environmental effect.

Answer 2

Using low value fish to feed high value fish in farms is bad because the low value fish are usually sourced form the wild. Look up the Menhaden. This fish was fished near extinction, but is never eaten by people, it is only used to feed farmed fish. Also, it takes about three pounds of feeder fish to grow one pound of farmed fish, so you end up taking three times the mass of fish from the wild by farming. Salmon are farmed in this manner. It is highly destructive.

Answer 3

The truth is, some high-value developing fish are simply not capable of digesting the fish-feed used traditionally in fish farming.  As a result, farmers are turning to the use of smaller, lower-value fish as feed.  Commercially, this is advantageous since more of the high-value fish are able to survive with this feeding method.  The environmental effect?  MUTANT fish.  When a larger fish ingests a small feed-fish (herring or anchovy), the small fish is rarely killed, but is instead swallowed whole.  The small fish will often live within the digestive tract of the larger fish for days, or sometimes weeks.  Out of desperation to pass on its GENETIC INFORMATION, the small fish will lay its eggs prematurely.  If these eggs become fertilized, they will be influenced by the hormones of the larger fish, and grow into massive predator-prey hybrids.  This has been well-documented in the scientific community.  These hybrid fish often find their way back into the ocean, and reek havoc on the natural fish populations.  It is estimated that 3 out of every 10 fish eaten in Japan may, in fact, be a HYBRIDIZED MUTANT (predator-prey).