MEATS AS TROUT FOOD 



139 



MEXICAN PINTO BEANS 



Reports of the successful use of cooked beans at certain rainbow 

 hatcheries in the West led to our giving this food a trial. The 

 results were similar to those obtained from the feeding of soybean 

 meal. When incorporated at 25 per cent in the meat ration lower 

 growth again resulted. With brook fingerlings (fig. 7) there was 

 little difference in the gi^owth when either Mexican beans or soy- 

 bean meal was used, although results with soybean meal were slightly 

 better. Rainbow fingerlings, however, did much better on Mexican 



X MORTALITY 



10 15 20 25 30 35 40 



29 17 

 MAY JUNL 



Figure 7. — Comparative growth and total mortality of brook trout fin- 

 gerlings fed beef liver, soybean meal, and Mexican pinto beans. AlO— 

 beef liver, 50; beef heart, 50 (control). .4.7 = beef liver, 75; soybean meal, 

 25. 4iJ = beef liver, 75; Mexican pinto beans, 25 



bean than on soybean combinations. (Fig. 8.) Experiments with 

 yearling brook and rainbow gave comparable data. 



Despite the fair success with Mexican beans, it does not seem 

 advisable to use them in preference to a suitable animal product, 

 as there is considerable trouble involved in cooking and prej^aring 

 them for trout. Bing (1927) arrived at similar conclusions, as he 

 found that trout receiving cooked beans in combination with raw 

 liver made a growth inferior to those on straight liver. 



MISCELLANEOUS PRODUCTS 



FOX FOOD 



There is considerable demand from various individuals and organi- 

 zations rearing small numbers of fish in nursery ponds for some 

 cheap canned product suitable for trout. We have used but one 

 food of this type. 



