Changes in haematology during upstream migration to American shad
نویسندگان
چکیده
منابع مشابه
Feeding Behavior of American Shad during Spawning Migration in the York River, Virginia
—Throughout its native range, American shad Alosa sapidissima is thought to cease feeding during anadromous migration. We examined the feeding habits of American shad during spawning migration by documenting changes in diet composition and feeding that occur in mature fish in the York River, Virginia. American shad were collected prior to and after spawning at various locations on a gradient fr...
متن کاملThe Stress Response of Juvenile American Shad to Handling and Confinement Is Greater during Migration in Freshwater than in Seawater
—The physiological responses of juvenile American shad Alosa sapidissima were evaluated during the period of downstream migration in freshwater (FW) and after seawater (SW) acclimation associated with postmigration. Fish were subjected to a standardized, acute handling and confinement stress (3 h). Changes in plasma cortisol, plasma chloride, and hematocrit were monitored for 24 h. Basal levels...
متن کاملThe process of kidney gradual changes in, Tenualosa ilisha during migration from sea to the river
Abstract In order to study kidney changes in, Tenualosa ilisha during migration from sea to the river, twenty mature T. ilisha specimens were collected from the Persian Gulf (42.7ppt salinity and 29.27°C temperature) and twenty specimens from Arvand River (2.3ppt salinity and 21.16°C temperature). Macroscopic observation indicated that the kidney was located retroperitoneal and attached to...
متن کاملVariation in American Shad Batch Fecundity
—American shad Alosa sapidissima in semelparous and iteroparous populations along its native range are thought to have nearly equivalent lifetime reproductive output due to reciprocal latitudinal trends in fecundity and degree of repeat spawning. Geographic differences in reproductive patterns are believed to be linked to varying environmental conditions, and this fine tuning is considered stro...
متن کاملLate migration and seawater entry is physiologically disadvantageous for American shad juveniles
Juvenile American shad Alosa sapidissima were subjected to isothermal transfers into sea water (salinity 24) ‘early’ (1 September; 24 C) and ‘late’ (10 November; 10 C) in the autumn migratory season. Early acclimation resulted in a modest osmotic perturbation that recovered rapidly. Haematocrit declined by 14% at 24 h, recovering within 48 h. Plasma osmolality increased by 6% at 4 h, recovering...
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ژورنال
عنوان ژورنال: Journal of Fish Biology
سال: 1999
ISSN: 0022-1112,1095-8649
DOI: 10.1111/j.1095-8649.1999.tb02050.x