. Commercial fisheries review. Fisheries; Fish trade. 48. Fig. 6 - A school of thread herring 150 leet in diameter spotted from the aircraft at 3,b00 feet. The taint lu fied by lo-light sensor before appearing on TV screen shown in photo. linescence was ampli- With SANOS scope in helicopter (Fig. 8), several schools about 300 feet wide were sighted off Sanibel Island from 500 to 5,000 feet altitude. The luminescence was visually intense from spotter aircraft at 2,000 feet as helicopter videotaped school at 500 feet. The glow was brilliant despite twilight and early morning haze, probably becau
. Commercial fisheries review. Fisheries; Fish trade. 48. Fig. 6 - A school of thread herring 150 leet in diameter spotted from the aircraft at 3,b00 feet. The taint lu fied by lo-light sensor before appearing on TV screen shown in photo. linescence was ampli- With SANOS scope in helicopter (Fig. 8), several schools about 300 feet wide were sighted off Sanibel Island from 500 to 5,000 feet altitude. The luminescence was visually intense from spotter aircraft at 2,000 feet as helicopter videotaped school at 500 feet. The glow was brilliant despite twilight and early morning haze, probably because helicopter noise frightened school. 2. Perimeter of school usually is well de- fined. 3. The school is detectable to sensor and television camera from 5,000 feet. Results show that low-light sensors can detect fish schools invisible to naked eye at night. Visual and low-light-sensor observations during moonless nights show that: APPLICATION OF LOW-LIGHT SENSORS TO FISHERIES & RESEARCH 1. Bioluminescence makes school conspi- cuous. Low-light sensors may be applied in two ways:. 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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