56U EXPERIMENTAL FISH EMBRYOLOGY 



Mealworma - particularly good for fish when chopped fine. 



Mosquito larvae - a natural food, excellent. 



Tuhifex - the red worm used moat commonly. This is a sewage worm and can be 

 handled by adult fiah but should not be a steady diet. Should be kept in 

 running cold water to reduce incidence of transmitting parasites to fish. 



Prepared Foods : 

 Ant egga 



Baby fish food, powdered for fry 

 Beef, shredded 



Cereals - fine grained varieties 

 Clams, chopped finely 

 Daphnia, dried 

 Dried flies 

 Egg, hard boiled yolk 

 Lacto-Pep (see Tricker) 

 Lettuce, wilted 

 Lobster; canned and shredded 

 Oysters, chopped finely 

 Potato, boiled or baked white 

 Salmon, dried and dried eggs 

 Shrimp; canned, shredded or dried 

 Spinach, partially cooked 



Oatmeal, cooked with or without dried shrimp 

 (And a l-arge variety of powdered foods in any 10 cent store.) 



It is even possible to make up a home-made mixture which contains all of the neces- 

 sary ingredients. Take one can each of dog food, shrimp, and salmon; add a can of meat 

 scraps and grind all together with 1 lb. of partially cooked spinach through a fine meat 

 chopper. Spread the mixture out thinly on heavy brown paper and place in the direct sun- 

 light until thoroughly dry. Eegrind when dried, through finest coffee grinder. The sun 

 will kill any parasites and may add some vitamin value, or a small amoxint of cod liver 

 meal may be added to the above for vitamins. This mixture should be stored in stoppered 

 bottles in the refrigerator. It should be made fresh every two weeks. 



FORMULAE FOR BALANCED FISH FOODS 



The prepared foods readily available are satisfactory in emergencies but they general- 

 ly lack some nutritional requisite, particularly vitamins. Two formulae are given below 

 which are cunrently used at the American Museum of Natural History. 



1. Arone on ' s formula : 



a. -k finger bowl of chopped spinach. 

 5 finger bowl of chopped lettuce 



Add a little water to the above and bring to a boil, then stop. 

 Separate the fluid from the solid by straining through a fish net. 



b. Take 5 lb. liver, chop fine, add spinach water and grind. 



c. Take finger bowl of dried shrimp, add I5 finger bowl of pablum. 



d. Add all the above mixtures together, with a pinch of salt. Mix thoroughly. 



e. Spread out thin on hard wood board, place in sunlight to dry. If too wet, 



add more pablum to take up the moisture. 



f. When almost dry, put through fine meat grinder twice. For small fish, put 



through grinder a third time. Will keep in refrigerator for a long time. 



2. Gordon's formula : (The Aquarium 191+5, Vol. 12:8?) 



a. Get 5 lb. beef liver, 10 tablespoons of Pablum (or Seravim), 1 teaspoon of 



salt. 



b. Eemove the connective tissue covering the liver, and the larger blood ves- 



sels. Cut the liver into 5 inch pieces and chop until it is a liquid mash. 

 If available, use a Waring Blender (i.e., liquidizer), which is rapid and 

 thorough. If the liquidizer la uaed, an equivalent weight of water must 

 be added to the liver, and the aubsequent maah ia atrained through an ordi- 

 nary sieve. 



