. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CARDIAC RESPONSES OF FISHES 365 13 seconds, and compound flights of 28 seconds. (A flight of 42 seconds has been reported.) When flying fish are taken out of water a pronounced bradycardia occurs (Figs. 2, 4). This slowdown to one-third of normal continues until submergence initiates a sharp acceleration of rate. Fish swimming in the ocean with attached electrodes displayed similar effects when pulled from the water and returned. MUDSKIPPER (Periophthalmodon australis) This mudskipper inhabits the brackish and marine mangrov
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CARDIAC RESPONSES OF FISHES 365 13 seconds, and compound flights of 28 seconds. (A flight of 42 seconds has been reported.) When flying fish are taken out of water a pronounced bradycardia occurs (Figs. 2, 4). This slowdown to one-third of normal continues until submergence initiates a sharp acceleration of rate. Fish swimming in the ocean with attached electrodes displayed similar effects when pulled from the water and returned. MUDSKIPPER (Periophthalmodon australis) This mudskipper inhabits the brackish and marine mangrove-fringed mudflats of tropic seas in the Australian region. The mudskippers act more like amphibians MUD SKIPPER 08 BEATS/MIN. FIGURE 5. Electrocardiogram of a mudskipper in air and in water. than fishes, in that they perch on the mud and mangrove roots and seldom stay in water. When approached by humans, they scurry into a mud burrow or skitter away atop the water. When a mudskipper is put into water it almost always develops a brady- cardia, but when it is exposed to air its cardiac rate increases (Fig. 5). It was noted that heart rates decrease after 3-4 minutes in either water or air. Squeezing air from gill pouches, physical agitation, noise, and noxious gas have no notice- able effect upon cardiac rate. It is well known that mangrove mud is highly anaerobic (Scholander et al., 1955). A check on the mud in one burrow showed it to be almost free of oxygen. The anaerobic nature of the burrow is physiologi- cally reflected in a greatly reduced heart rate when the mudskipper is underground (Fig. 6).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
