. Commercial fisheries review. Fisheries; Fish trade. 47. Fig. 4 - School of Spanish mackerel showing associated bioluminescence as detected with star light scope and seen on television screen. School is 5 to 10 feet below surface; its distance from sensor is about 50 feet. and a helicopter stationed at St. Petersburg, Florida, Coast Guard Air Base. A commer- cial fish spotter was chartered to spot schools of thread herring during daylight over com- mercial fishing grounds off Sanibel Island, Florida. A search of the same area at night revealed luminescing schools near surface. At altitude of
. Commercial fisheries review. Fisheries; Fish trade. 47. Fig. 4 - School of Spanish mackerel showing associated bioluminescence as detected with star light scope and seen on television screen. School is 5 to 10 feet below surface; its distance from sensor is about 50 feet. and a helicopter stationed at St. Petersburg, Florida, Coast Guard Air Base. A commer- cial fish spotter was chartered to spot schools of thread herring during daylight over com- mercial fishing grounds off Sanibel Island, Florida. A search of the same area at night revealed luminescing schools near surface. At altitude of 3,500 feet, a luminescing school was amplified by the low-light sensor before appearing on television screen (Fig. 6). The width of crescent-shaped school' was esti- mated by spotter pilot at 150 feet. Night aerial search near Ft. Myers Beach, Florida, re- vealed an elliptical school with long axis of about 500 feet (Fig. 7). Sporadic flashes in school probably were caused by nocturnal predators, such as shark or tarpon. Lumi- nescing schools were detected in same gen- eral area during three consecutive nights. Fig. 5 - A Spanish mackerel outlined by definite field of light around 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 United States. National Marine Fisheries Service; U. S. Fish and Wildlife Service; United States. Bureau of Commericial Fisheries. [Washington] : National Marine Fisheries Service; [for sale by the Supt. of Docs. , U. S. Govt. Print. Off. ]
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Keywords: ., book, bookcentury1900, booksubjectfisheries, booksubjectfishtrade
