Accession Number : AD0709324

Title :   TWO TYPES OF DIURNAL VERTICAL MIGRATIONS OF COD (Dva Tipa Sutochnykh Vertikalnykh Migratsii Treski),

Corporate Author : NAVAL OCEANOGRAPHIC OFFICE WASHINGTON D C

Personal Author(s) : Konstantinov,K. G. ; Turuk,T. N.

Report Date : 1970

Pagination or Media Count : 11

Abstract : As other carnivores, the cod pursues fishes mainly during the night or at dawn. This has also been demonstrated by aquatorial observations. Capelin, one of the major food items of cod, migrates to higher strata in the evening. The cod, affected by changes in illumination rises to the surface. Thus, it follows the pattern of the first type of vertical migration. The sand eel spawns on the bottom for days. The night carnivore cod hunts for the eel in nighttime. Therefore, trawl catches contain large quantities of cod. In daytime the cod migrates to higher strata, the ones that remain in bottom layer continue to feed on the benthos at somewhat more intense rate than at night. (Author)

Descriptors :   (*FISHES, MOBILITY), (*MOBILITY, DIURNAL VARIATIONS), WATER, TEMPERATURE, FOOD, BEHAVIOR, LIGHT, DISTRIBUTION, AQUATIC ANIMALS

Subject Categories : Biology

Distribution Statement : APPROVED FOR PUBLIC RELEASE