. Bulletin of the Bureau of Fisheries. ar one end of which a shelf was 98 BULLETIN OF THE BUREAU OF FISHERIES. fastened, containing an apeiture large to admit the head of a fish. The bodyof the animal was loosely bandaged, the cloth being tacked to the vertical piece ofwood in order to restrain movement (fig. 2). A piece of sheet rubber was then per-forated and drawn over the head in such a way that it fitted snugly around the l)ody,just behind the gill covers. The mai-gin of the rubber being tacked to the woodenframe, a nearly water-tight partition resulted, which served to bound ofi
. Bulletin of the Bureau of Fisheries. ar one end of which a shelf was 98 BULLETIN OF THE BUREAU OF FISHERIES. fastened, containing an apeiture large to admit the head of a fish. The bodyof the animal was loosely bandaged, the cloth being tacked to the vertical piece ofwood in order to restrain movement (fig. 2). A piece of sheet rubber was then per-forated and drawn over the head in such a way that it fitted snugly around the l)ody,just behind the gill covers. The mai-gin of the rubber being tacked to the woodenframe, a nearly water-tight partition resulted, which served to bound ofi the headfrom the trunk region. The frame, bearing the fish, was now immersed in a rectan-gular jar of water, the head being uppermost, except in two specified cases. Fresh(or salt) water was supplied to the jar through a rubber tube, while another tubecarried salt (or fresh) water into the mouth, allowing it to pass out through the second bandage held the head in position, while the pectoral fins were securelybound to f^ rr^zi periment lo determii , playefl by the gills The following six experiments were made with the carp. The fishes wereweighed before and after the treatment, the same precautions being taken as havealready been described for earlier 113. New York, May, 1905. One carp (fed 2-i hours previously), weight Salt water () through gills, fresh on body. After 5 hours alive,though feeble; weight ) grams. The fish thus lost 6 per One carp (fed 24 hours previously), weight grams. Fresh waterthrough gills, salt on body. After 5i hours fish well; weight thus practically unchanged. « Date and place the same lor all of this series. EFFECTS UPON FISHES OF CHANGES IN SALINITY OF WATER. 99 Experiment 115. One carp (unfed for 22 days), weight grams. Salt water throughgills, fresh on body. After 15 hours tish dead; weight grams. Loss ofabout 4 per
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfisheries, bookyear19
