Title: Commercial fisheries review
Identifier: commercialfish321970unit (find matches)
Year: 1946 (1940s)
Authors: United States. National Marine Fisheries Service; U. S. Fish and Wildlife Service; United States. Bureau of Commericial Fisheries
Subjects: Fisheries; Fish trade
Publisher: (Washington) : National Marine Fisheries Service; (for sale by the Supt. of Docs. , U. S. Govt. Print. Off. )
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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SPACE-AGE TECHNOLOGY USED TO FIND FISH The National Marine Fisheries Service (NMFS) plans to move some personnel to NASA's Mississippi test facility to use its sophisticated technical equipment. This will allow NMFS to expand its Remote Sensor technology program, says William Stevenson, who will be in charge. Historically, locating and assessing fish stocks have taken place from slow-moving ships covering very little ocean surface. In some fisheries, up to 85% of vessel-operating time is spent findingfish. New technology in remote sensing may revo- lutionize detection, identification, and cen- susing of open-sea fishery resources. The Equipment Used Recent studies at NMFS1 Exploratory Fish- ing and Gear Research Base in Pascagoula, Miss., have shown that airborne sensors can be used to locate and identify surface and near-surface fish schools. Using aerial photography and special films and cameras, scientists have found that they can locate and identify fish schools. Identifi- cation is based on differences in color or spectral reflectance. Observations were made of 15 commercially important species. Measurements were made on single speci- mens, on groups, and on schools inside im- poundments. The results showed different species reflected different color spectrums; these could be used for identification. With multispectral photographic system and spectroradiometers, NMFS scientists penetrated the water optically, detected the presence of fish schools, and measured the color pattern or spectral reflectance.
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Spanish mackerel swimming at night create a "fire" in the water. The "fire" is caused by tiny organisms that glow when disturbed by swimming fish. NMFS scientists use image intensifiers to amplify tins light -10,000 limes or more. They believe that these devices can be used from aircraft to help fishermen find and identify schools of fish. 16

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