A history of the research on the early marine life of Pacific salmon off
... production, sex ratios, and freshwater mortality. Most research in the 1930s and 1940s was by R.E. Foerster on sockeye salmon (Oncorhynchus nerka), with some work on pink salmon (Oncorhynchus gorbuscha) and chum salmon (Oncorhynchus keta) by A.L. Pritchard and W.M. Cameron. The freshwater phase of t ...
... production, sex ratios, and freshwater mortality. Most research in the 1930s and 1940s was by R.E. Foerster on sockeye salmon (Oncorhynchus nerka), with some work on pink salmon (Oncorhynchus gorbuscha) and chum salmon (Oncorhynchus keta) by A.L. Pritchard and W.M. Cameron. The freshwater phase of t ...
Document
... these coasts, they don’t chomp on the plants they consume. They are filter feeders that live primarily on tiny or even microscopic plants and other suspended matter, much of it indigestible or toxic to most other aquatic animals. Dense schools of menhaden, sometimes numbering in the hundreds of thou ...
... these coasts, they don’t chomp on the plants they consume. They are filter feeders that live primarily on tiny or even microscopic plants and other suspended matter, much of it indigestible or toxic to most other aquatic animals. Dense schools of menhaden, sometimes numbering in the hundreds of thou ...
The Variable Position of Arctic Charr (Salvelinus alpinus (L.))
... interspecific resource competition may restrict the trophic niche of sympatric species, whereas intraspecific competition may induce individual niche specialization and thus lead to a widened niche use at the population level (cf. Bolnick et al. 2003, Araújo et al. 2011). Hence, the ability of gener ...
... interspecific resource competition may restrict the trophic niche of sympatric species, whereas intraspecific competition may induce individual niche specialization and thus lead to a widened niche use at the population level (cf. Bolnick et al. 2003, Araújo et al. 2011). Hence, the ability of gener ...
Cover Sheet July 2012 Internal Review Draft
... Compensation Plan 1, and Idaho Department of Fish Bonneville Power and Game (IDFG) Administration, and Idaho Power Company Each permit application includes a Hatchery and Genetic Management Plan (HGMP), and a single addendum that applies to both HGMPs. The addendum was developed jointly by WDFW and ...
... Compensation Plan 1, and Idaho Department of Fish Bonneville Power and Game (IDFG) Administration, and Idaho Power Company Each permit application includes a Hatchery and Genetic Management Plan (HGMP), and a single addendum that applies to both HGMPs. The addendum was developed jointly by WDFW and ...
ingram et al 2012 evolution - Zoology, UBC
... southwestern British Columbia naturally occur with and without intraguild predators (Vamosi 2003), making them an appropriate system in which to test for evolutionary responses to intraguild predation. Stickleback repeatedly colonized small lakes from the ocean at the end of the last ice age (about ...
... southwestern British Columbia naturally occur with and without intraguild predators (Vamosi 2003), making them an appropriate system in which to test for evolutionary responses to intraguild predation. Stickleback repeatedly colonized small lakes from the ocean at the end of the last ice age (about ...
Health impact assessment from consumption of fish from Lake Fiskville
... environmental contamination that may have arisen as a result of historical fire fighting training at the CFA Fiskville training ground. During these investigations it was discovered the sediment and water of Lake Fiskville had become contaminated with perfluorinated chemicals (PFCs). Consultation wi ...
... environmental contamination that may have arisen as a result of historical fire fighting training at the CFA Fiskville training ground. During these investigations it was discovered the sediment and water of Lake Fiskville had become contaminated with perfluorinated chemicals (PFCs). Consultation wi ...
definitions of harmful alteration, disruption or destruction (hadd)
... Eelgrass aggregations (meadows) are considered fish habitat and are therefore protected from harmful alteration, disruption and destruction (HADD) unless authorized under Section 35 of the Fisheries Act. Environmental effects of greatest concern in eastern Canada to eelgrass and its function as fish ...
... Eelgrass aggregations (meadows) are considered fish habitat and are therefore protected from harmful alteration, disruption and destruction (HADD) unless authorized under Section 35 of the Fisheries Act. Environmental effects of greatest concern in eastern Canada to eelgrass and its function as fish ...
WDFW Pacific Salmon and Wildlife
... delivered by anadromous salmon to the rivers of Puget Sound, the Washington Coast, Columbia River, and the Oregon Coast is currently reaching those streams. There have also been many other losses of salmon habitat during this period caused by: river channel clearing and channelization, log driving a ...
... delivered by anadromous salmon to the rivers of Puget Sound, the Washington Coast, Columbia River, and the Oregon Coast is currently reaching those streams. There have also been many other losses of salmon habitat during this period caused by: river channel clearing and channelization, log driving a ...
Patterns of distribution and abundance of larval fish in a southern
... The distribution and abundance of larval fish in the Kaikoura region, on the northeastern coast of the South Island of New Zealand, was investigated over a four year period (1994 - 1997). Spatial and temporal variability were described on both broad and fine scales. Larval fish assemblages at four s ...
... The distribution and abundance of larval fish in the Kaikoura region, on the northeastern coast of the South Island of New Zealand, was investigated over a four year period (1994 - 1997). Spatial and temporal variability were described on both broad and fine scales. Larval fish assemblages at four s ...
June X, 2006 - Wild Fish Conservancy
... populations within the PS steelhead DPS, and forestalls the potential for exploiting those uncertainties to reach an inaccurate and inappropriate conclusion that the extinction risk for PS steelhead is low. However, we believe the PS Steelhead Proposed Listing illustrates that NOAA’s application of ...
... populations within the PS steelhead DPS, and forestalls the potential for exploiting those uncertainties to reach an inaccurate and inappropriate conclusion that the extinction risk for PS steelhead is low. However, we believe the PS Steelhead Proposed Listing illustrates that NOAA’s application of ...
... fishing areas have reached their maximum potential. Sustaining fish supplies from capture fisheries will, therefore, not be able to meet the growing global demand for aquatic food. Aquaculture appears to have the potential to make a significant contribution to this increasing demand for aquatic food ...
- The Lincoln Repository
... 1. Despite growing interest in ecological consequences of parasitism in food webs, relatively little is known about effects of parasites on long-term population dynamics of non-host species or about whether such effects are density- or trait- mediated. 2. We studied a tri-trophic food chain comprise ...
... 1. Despite growing interest in ecological consequences of parasitism in food webs, relatively little is known about effects of parasites on long-term population dynamics of non-host species or about whether such effects are density- or trait- mediated. 2. We studied a tri-trophic food chain comprise ...
Columbia River Food Web Report
... Figure C.4.1. Relative contributions of wild and hatchery origin fish to the total catch of anadromous salmonids in the Columbia River Basin in 2009. From CBFWA (2010). ........................................................................................... 76 Figure C.4.2. Numbers of juvenile ...
... Figure C.4.1. Relative contributions of wild and hatchery origin fish to the total catch of anadromous salmonids in the Columbia River Basin in 2009. From CBFWA (2010). ........................................................................................... 76 Figure C.4.2. Numbers of juvenile ...
Native grouper indirectly ameliorates the negative effects of invasive
... al. 2015). Furthermore, it has been widely debated whether mesopredators such as groupers actually function as biocontrol for invasive lionfish (see Mumby et al. 2011 and subsequent responses by Hackerott et al. 2013 and Valdivia et al. 2014). However, Pusack (2013) reported that Nassau grouper appe ...
... al. 2015). Furthermore, it has been widely debated whether mesopredators such as groupers actually function as biocontrol for invasive lionfish (see Mumby et al. 2011 and subsequent responses by Hackerott et al. 2013 and Valdivia et al. 2014). However, Pusack (2013) reported that Nassau grouper appe ...
compro manton
... helminth infections, we have observed that H. contortus faecal egg excretion following primary exposure was markedly affected by the age of the animals, which was in turn strongly associated with an agedependent increasing level of blood eosinophilia (unpublished observations). The contribution of t ...
... helminth infections, we have observed that H. contortus faecal egg excretion following primary exposure was markedly affected by the age of the animals, which was in turn strongly associated with an agedependent increasing level of blood eosinophilia (unpublished observations). The contribution of t ...
Janet Ashley Nye, Ph.D., 2008 Directed By:
... Table 3.2: Spearman rank correlation coefficients between the percentage of anchovy and polychaetes in diets of Atlantic croaker with six measures of condition. Significance at P=0.0042 (Bonferroni adjustment, P=0.05/12) indicated by *. ......... 89 Table 4.1: Number of replicates in each size class ...
... Table 3.2: Spearman rank correlation coefficients between the percentage of anchovy and polychaetes in diets of Atlantic croaker with six measures of condition. Significance at P=0.0042 (Bonferroni adjustment, P=0.05/12) indicated by *. ......... 89 Table 4.1: Number of replicates in each size class ...
Myxobolus cerebralis
Myxobolus cerebralis is a myxosporean parasite of salmonids (salmon, trout, and their allies) that causes whirling disease in farmed salmon and trout and also in wild fish populations. It was first described in rainbow trout in Germany a century ago, but its range has spread and it has appeared in most of Europe (including Russia), the United States, South Africa and other countries. In the 1980s, M. cerebralis was found to require a tubificid oligochaete (a kind of segmented worm) to complete its life cycle. The parasite infects its hosts with its cells after piercing them with polar filaments ejected from nematocyst-like capsules.Whirling disease afflicts juvenile fish (fingerlings and fry) and causes skeletal deformation and neurological damage. Fish ""whirl"" forward in an awkward, corkscrew-like pattern instead of swimming normally, find feeding difficult, and are more vulnerable to predators. The mortality rate is high for fingerlings, up to 90% of infected populations, and those that do survive are deformed by the parasites residing in their cartilage and bone. They act as a reservoir for the parasite, which is released into water following the fish's death. M. cerebralis is one of the most economically important myxozoans in fish, as well as one of the most pathogenic. It was the first myxosporean whose pathology and symptoms were described scientifically. The parasite is not transmissible to humans.