Predicting and mitigating the impact of anthropogenic barriers on migratory fish requires an understanding individual environmental factors that influence barrier passage. Here, upstream spawning migrations iteroparous twaite shad Alosa fallax were investigated over three successive in a highly fragmented river basin using passive acoustic telemetry ( n = 184). More approached passed lower reac...

Two fish cestodes, the little-known Eubothrium fragile (Rudolphi, 1802) and E. rugosum (Batsch, 1786), the type species of the genus Eubothrium Nybelin, 1922, are redescribed on the basis of new material from twaite shad, Alosa fallax (Lacépède, 1803), from England and burbot, Lota lota (Linnaeus, 1758), from Russia, respectively. The tapeworms are compared with two other species of the genus, ...

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards (or with the North American Stratigraphic Code). Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. FIGURE Number Page 1. Comparison of spectral (high uniform reflectivity of one color) and spacial (refle...

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...

Despite their widespread, global impact in both wild and cultured fishes, little is known of the diversity, transmission patterns, and phylogeography of parasites generally identified as Ichthyophonus. This study constructed a phylogeny based on the structural alignment of internal transcribed spacer (ITS) rDNA sequences to compare Ichthyophonus isolates from fish hosts in the Atlantic and Paci...

Juvenile salmon (Oncorhynchus spp.) use of reservoir food webs is understudied. We examined the feeding behavior of subyearling Chinook salmon (O. tshawytscha) and its relation to growth by estimating the functional response of juvenile salmon to changes in the density of Daphnia, an important component of reservoir food webs. We then estimated salmon growth across a broad range of water temper...

Purpose The purpose of this paper is to achieve effective governance online rumors through the proposed rumor propagation model and immunization strategy. Design/methodology/approach leverages agent-based modeling (ABM) method individuals from two aspects, behavior attitude. Based on analysis research data, we propose a model, namely Untouched view transmit removed-Susceptible hesitate agree di...

Small pelagics, or forage fish, link lower and higher trophic levels in marine food webs. Recently, attention has been given to the management of including anadromous river herring (Alewife Alosa pseudoharengus, blueback A. aestivalis) American shad (A. sapidissima) due their current depleted status historically important ecological economic roles. Little is known about impact changes biomass o...