Rainbow trout and brook trout will also eat tadpoles in the right situations. Young rainbow trout first eat waterfleas and then add aquatic (water) insects, like caddisflies, mayflies, and midges, to their diet. As with the other species of trout, rainbow trout populations in lakes grow faster: four-year-old fish attain lengths of 13 to 17 inches or more. The Golden Rainbow was developed from one fish, a single female trout with a genetic mutation that gave her a mixed golden and normal Rainbow Trout coloration. Nothing could be further from the truth. This has to do with the difference in the way trout feed in these different habitats. One can maximize the health benefits of eating rainbow trout by cooking it from a variety of methods like steaming, grilling, broiling, or baking. As they grow larger they include small fish, but continue to consume larval and adult insects. They also supplement the diet with other kinds of food, such as snail, leeches, fish eggs, sideswimmers, and algae. Rainbow trout (Oncorhynchus mykiss) are good to eat and a popular target for freshwater anglers.They belong to the family Salmonidae, which originally comes from North America but has been introduced for aquaculture and recreational fishing to every continent except Antactica. Lake trout can live many decades, and can grow to more than 30 kilograms (66 lb). Brown Trout Feeding Habits Brown Trout Feeding Habits. Rainbow trout in streams generally become mature during their second or third year, whereas lake fish tend to mature later. Rainbow trout is one of the healthiest fish you can include in your diet. They are not as piscivorous or aggressive as brown trout or chars. Rainbow trout are predators with a varied diet and will eat nearly anything they can capture. Lake trout inhabit many of the larger lakes in North America, and live much longer than rainbow trout, which have an average maximum lifespan of 7 years. There is a myth, probably started by the chalk-stream pundits of the late nineteenth century, that trout, particularly chalk-stream trout, live exclusively on genteel diets of mayflies, pale wateries and iron blue duns. This beautiful species of trout is now a popular and preferred choice for many fishermen all over the world. The flavor difference from farmed versus wild Rainbow Trout is that wild Rainbow Trout caught in lakes have an earthy taste. Rainbow Trout has grown in popularity over the past 20 years, due to its value as a fun fish to catch as well as a delicious fish to eat. The rainbow trout is an excellent alternative for protein. The Golden Rainbow Trout is a gold-orange Rainbow Trout raised under artificial fish culture conditions and stocked as a novelty for angling sport. Trout living in ponds or lakes are much more likely to eat tadpoles than river-dwelling trout. The best taste comes from wild trout that feed on shrimp and other sea creatures. They spawn almost exclusively in … The color indicates where they spend their time. Here are the seven health benefits of rainbow trout: 1. This is preferred over farmed Rainbow Trout that have a nutty flavor, which is least desired.