. Principles of economic zoo?logy. Zoology, Economic. PISCES 205 have spines on the tail. The thresher-shark {Alo'pias vulpes) has its pUable tail prolonged into a terrible weapon, with which, it is said, it can kill a whale. This lashing tail serves a second purpose by so frightening the small fishes that they crowd to- gether and are thus easily obtained for food. The "devil-fish" strikes terrible blows with its broad pectoral fins. The saw-fish. Fig. 165.—Sword-fish (Tetraptu'rus), yellow-fin tuna, and yellow tail, caught with rod and reel at Santa Catalina Island. (Bulletin of B.
. Principles of economic zoo?logy. Zoology, Economic. PISCES 205 have spines on the tail. The thresher-shark {Alo'pias vulpes) has its pUable tail prolonged into a terrible weapon, with which, it is said, it can kill a whale. This lashing tail serves a second purpose by so frightening the small fishes that they crowd to- gether and are thus easily obtained for food. The "devil-fish" strikes terrible blows with its broad pectoral fins. The saw-fish. Fig. 165.—Sword-fish (Tetraptu'rus), yellow-fin tuna, and yellow tail, caught with rod and reel at Santa Catalina Island. (Bulletin of B. of F., vol. xxviii, 1908.) (Fig. 164), sword-fish (Fig. 165), and the hke use their long strong jaws as frightful weapons. The torpedo and other electrical fishes surprise and stun their victims by an electric shock. Influence of Temperature.—Species differ in their ability to endure cold or heat. The brook trout loves the cool water of. 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 Daugherty, Lewis Sylvester, 1857-; Daugherty, L. S. , Mrs. , 1859-. Philadelphia, London, W. B. Saunders
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