A study of the bioluminescence of a deep scattering layer organism (Euphausia pacifica) in Monterey Bay, California
Compton, Andrew Jerome
Tucker, Stevens P.
Dunlap, Calvin R., III
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A vertical migration tube (VMT) was designed and constructed as an instrument to be used with a photomultiplier light detector to make in situ mesopelagic studies of deep scattering layer vertical migration organisms. Initial tests of the unit demonstrated the feasibility of its use in the marine environment. three major problems of marine bioluminescent studies using an underwater photomultiplier detector are resolved in part by use of the VMT with this sensor. Mesopelagic euphausiid crustaceans captured in the upper 100 meters of the water column at night decreased their bioluminescent flash rates when lowered in the water column and exposed primarily to pressure and temperature changes. There may be an increase in euphausiid bioluminescence flash rates when stimulated by other bioluminescent organisms. Laboratory test equipment and laboratory methods were developed to permit quantitative measurements of euphausiid bioluminescent output. Laboratory tests of Euphausia pacifica indicated a greater bioluminescent response to a standard flash stimulus during midnight tests as opposed to noon tests. Laboratory tests of bioluminescent activity during period of moulting indicated greater than average response to a photoflash stimulus just prior to moulting and less than average response just after moulting.
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