The Nome daily nugget., 1935-01-26

not unique. Swim bladders and other organs common to larger fishes are common to them, and their fins are the same-caudal, or tail, fins for swimming and propell- ing, fins beneath, called ventral and anal, and pectorals (behind the gills) for helping maintain the equi- librium; also, dorsal fins (on the back, which indicate moods and physical states-health and content ment when erect, illness and depres- sion when lowered. The majority have no sort of protection against enemies except in such teeth as they may possess.
 Some are so peaceable that Q number of species live amlcably in one tank; others so Quarrelsome that two males cannot occupy the same aquarium, and male may kill his mate.
 Some subslst largely on algae, but most favor small water animals, such as entomostracans (the mi- nutest of crustaceans), annelids, and insect larvae.
 Raw beef, cereals, roe, and she'll fish, also dried shrimp and other desiccated foods, appear on their bill of fare, and many experiments have been made with concentrated foods, such as cod-liver meal and other glandular products, to ascer- tain their response to vitamin nutri- tives-expefiments which have con- ffrmed their amenability to a for eign diet and especially to substi- tutes for the lime, minerals, en- zymes and other catalytic agents present in live food, which air di- gestion, purify the blood, and keep the skin lustrous.
 Mouth of Fish Incubator.
 The majority lay eggs and leave them to their fate. but some carry their eggs in their mouths, taking no food while incubation is in prog ress, and subsequently, caring for the young, which swim back into the mouth at the approach of dan ger.
 Some build nests and vigilantly guard the eggs and fry; others bring forth their young alive.
 Nearly always when the fry re- ceive any care it Is given by the fa- ther, but in mouth-breeding species 1t Is usually the mother who gath CTS up the spawn, and among G. chlids, which include the Brazil ian half-moon and Mesonauta, both sexes guard the egg and fry.
 Tn yet another species, the Chan chito, the eggs are matched in a nest scooped in the sand by the male fish. When able to swim, the young rise and school, the mother leading the procession, the father bringing up the rear.
 Hazards of TropicaIs.
 The only martyrdom to which the troplcals are subjected Is acci- dental. Some expire from the cold. Occasionally an aquarium Is left uncovered and the fishes, many spe- cies of which leap like salmon, clear the rim with one jump and dry up on the floor; or an aquarist con cerned for their comfort may trans fer their tank to radiator and forget 1t until they are completely cooked.
 Exportation of toy fishes from Germany into the United States be- gan nearly 30 years ago, numerous species having been first success fully bred in that country from par ent stock captured in its tropical hauntS. Though many thousands now are propagated elsewhere, a large percentage of those owned in the United States being nome grown" considerable numbers still are shipped from Germany and South America.
 Europe boasts permanent and notable exhibits of toy fishes In half a dozen of its public aQuariums- those of London, Amsterdam, Ant werp, Berlin, Frankfort and Lelp- zig, The United States lays claim to two. That of the Lincoln park aquarium, in Chicago, consists of 58 tanks, showing many brilliant sps- cies from the Orient and South America. That of the Steinhart aquarium, In San Francisco, con sists of 81 tanks of similar species and, In addition, many brought from Samoa and Hawaii, which display the vivid colors and the fantastic shapes that characterize the 0shes of those waters today.