Climate Change and Fish Communities: A Conceptual Framework
... Department of Zoology, University of Alberta, Edmonton, Alberta T6G 2E9, Canada Abstract.—Many autecological effects of temperature on fish are known, and fishery biologists have begun to incorporate this knowledge into population-level relations that can be used to assess possible effects of climat ...
... Department of Zoology, University of Alberta, Edmonton, Alberta T6G 2E9, Canada Abstract.—Many autecological effects of temperature on fish are known, and fishery biologists have begun to incorporate this knowledge into population-level relations that can be used to assess possible effects of climat ...
(Hypseleotris compressa) - Department of Environment, Land
... Worms, water fleas, prawns and insects make up its diet (Merrick and Schmida 1984). It is also known to be a surface feeder at dusk (Pidgeon, 1989). The Freshwater Herring is a schooling fish. Schooling may be used by species to confuse predators, particularly when habitat is open and devoid of refu ...
... Worms, water fleas, prawns and insects make up its diet (Merrick and Schmida 1984). It is also known to be a surface feeder at dusk (Pidgeon, 1989). The Freshwater Herring is a schooling fish. Schooling may be used by species to confuse predators, particularly when habitat is open and devoid of refu ...
Literature review of gear-based management options
... Compared to mesh size, relatively little research has been published on the effects of escape gaps on trap catches (Johnson, 2010; Munro et al., 2003). Escape gaps are narrow slits that are built into a trap (Figure 3), with tested sizes varying from short gaps, e.g. 7 x 2.5 cm, to taller gaps, e.g. ...
... Compared to mesh size, relatively little research has been published on the effects of escape gaps on trap catches (Johnson, 2010; Munro et al., 2003). Escape gaps are narrow slits that are built into a trap (Figure 3), with tested sizes varying from short gaps, e.g. 7 x 2.5 cm, to taller gaps, e.g. ...
DISPERSAL OF LIVING ORGANISMS INTO AQUATIC ECOSYSTEMS
... of the former and its predominant importance to mankind. In such areas as nutrition, disease control, genetics, and husbandry, aquaculture has a lot of experience yet to be obtained and utilized. In nearly every instance where an exotic aquatic species has been the subject of culture, escape into op ...
... of the former and its predominant importance to mankind. In such areas as nutrition, disease control, genetics, and husbandry, aquaculture has a lot of experience yet to be obtained and utilized. In nearly every instance where an exotic aquatic species has been the subject of culture, escape into op ...
Chemical Defense Against Different Marine Herbivores: Are
... Abstract. The structurally similar diterpenoid alcohols pachydictyol-A and dictyol-E are produced by the brown seaweed Dictyota dichotoma. This seaweed and several related species that also produce these compounds are known to be relatively low preference foods for tropical fishes and urchins. We ev ...
... Abstract. The structurally similar diterpenoid alcohols pachydictyol-A and dictyol-E are produced by the brown seaweed Dictyota dichotoma. This seaweed and several related species that also produce these compounds are known to be relatively low preference foods for tropical fishes and urchins. We ev ...
The influence of connectivity on richness and temporal variation of
... did not consider tidal phases. All surveys were conducted by a single diver (J.B.) with extensive training in under water fish identification, including small and cryptic species (Belmaker et al. 2007, 2008; Belmaker 2009). All fishes that swam within a distance of 0.5 m from the ARs were recorded, ...
... did not consider tidal phases. All surveys were conducted by a single diver (J.B.) with extensive training in under water fish identification, including small and cryptic species (Belmaker et al. 2007, 2008; Belmaker 2009). All fishes that swam within a distance of 0.5 m from the ARs were recorded, ...
Stock assessment – the basics The science of counting fish
... catch rates throughout different seasons than research vessels do. However, commercial fishermen do not always fish in all areas of the North Sea. Fishermen adjust their fishing locations according to the presence of fish or certain size classes of fish, their quotum and catching opportunities, or o ...
... catch rates throughout different seasons than research vessels do. However, commercial fishermen do not always fish in all areas of the North Sea. Fishermen adjust their fishing locations according to the presence of fish or certain size classes of fish, their quotum and catching opportunities, or o ...
Competition, predation and flow rate as mediators
... should simultaneously contribute to structuring this food chain. Food chain system and study site Atlantic salmon occurs naturally in the rivers of North Atlantic coastlines. They spend the first 2–5 years of life in their natal river before migrating to sea to feed and grow. After maturing, they re ...
... should simultaneously contribute to structuring this food chain. Food chain system and study site Atlantic salmon occurs naturally in the rivers of North Atlantic coastlines. They spend the first 2–5 years of life in their natal river before migrating to sea to feed and grow. After maturing, they re ...
Diel movements of out-migrating Chinook salmon (Oncorhynchus
... Chinook salmon and steelhead smolts in the reach of the river below Keswick Dam in Redding, California commonly referred to as the Lower Sacramento, to ocean entry at the Golden Gate. We separated the study area into six reaches based on changes in habitat: 1) upper river from Redding to Hamilton Ci ...
... Chinook salmon and steelhead smolts in the reach of the river below Keswick Dam in Redding, California commonly referred to as the Lower Sacramento, to ocean entry at the Golden Gate. We separated the study area into six reaches based on changes in habitat: 1) upper river from Redding to Hamilton Ci ...
Intraspecific priority effects and disease interact to alter population
... dynamics. Hosts consume infectious spores during feeding and die 10–14 days post-infection, releasing spores back into the water column (Green 1974). While non-castrating, this parasite reduces fecundity of infected hosts (Auld et al. 2012). Resistance to infection is tied to foraging ecology. Faste ...
... dynamics. Hosts consume infectious spores during feeding and die 10–14 days post-infection, releasing spores back into the water column (Green 1974). While non-castrating, this parasite reduces fecundity of infected hosts (Auld et al. 2012). Resistance to infection is tied to foraging ecology. Faste ...
Trophic interactions and behaviour Per B. Holliland
... greatest immediately post release; the risk of mortality diminished markedly should they survive the first weeks (ibid.). The reason for this Brown and Laland (2001) conclude is likely due to the deficit in virtually all aspects of behaviour owing to the impoverished conditions in which they are rai ...
... greatest immediately post release; the risk of mortality diminished markedly should they survive the first weeks (ibid.). The reason for this Brown and Laland (2001) conclude is likely due to the deficit in virtually all aspects of behaviour owing to the impoverished conditions in which they are rai ...
Effects of Fishing on Inter and Intra Stock Gudrun Marteinsdóttir *
... Marteinsdóttir and Thorarinsson 1998; Marteinsdóttir et al. 2005; Ottersen et al. 2006). In recent years, evidence that fishing not only affects populations demographically but also changes their genetic composition has accumulated (Heino and Godø 2002). Evolutionary pressures are exerted through fi ...
... Marteinsdóttir and Thorarinsson 1998; Marteinsdóttir et al. 2005; Ottersen et al. 2006). In recent years, evidence that fishing not only affects populations demographically but also changes their genetic composition has accumulated (Heino and Godø 2002). Evolutionary pressures are exerted through fi ...
Effect of Common Carp (Cyprinus carpio) on Aquatic Restorations
... detoxification. Natural detoxification occurs within 2 days to 2 weeks in late summer. Warm water temperatures, high alkalinity, and sunlight in clear waters will accelerate detoxification while turbidity and decreased light penetration in deep water will inhibit the process. Rotenone can remain tox ...
... detoxification. Natural detoxification occurs within 2 days to 2 weeks in late summer. Warm water temperatures, high alkalinity, and sunlight in clear waters will accelerate detoxification while turbidity and decreased light penetration in deep water will inhibit the process. Rotenone can remain tox ...
عرض تقديمي من PowerPoint
... In a straight forward situation a small organism (Parasite) has the potential to harm a larger organism (Host), and relies on said host for nutrients and shelter (a Niche). The parasite generally has a much higher reproductive capability compared to its host. ...
... In a straight forward situation a small organism (Parasite) has the potential to harm a larger organism (Host), and relies on said host for nutrients and shelter (a Niche). The parasite generally has a much higher reproductive capability compared to its host. ...
Curonian Lagoon
... the indicators assessed. The years of 1996, 1998 and 1999 do, however, to some extent differ from the other years in the time-series. During these three years the abundance of perch and piscivores was relatively high, as were the diversity, trophic level and proportion of piscivores. Background and ...
... the indicators assessed. The years of 1996, 1998 and 1999 do, however, to some extent differ from the other years in the time-series. During these three years the abundance of perch and piscivores was relatively high, as were the diversity, trophic level and proportion of piscivores. Background and ...
Green Crab - Virginia Beach City Public Schools
... mechanisms by which the parasite kills the host are not understood. Dermo tends to have its largest impact on oysters about the time they reach market size. MSX disease is also caused by a protozoan. It is more virulent than Dermo, although as far as is known, it also kills by reproducing to vast nu ...
... mechanisms by which the parasite kills the host are not understood. Dermo tends to have its largest impact on oysters about the time they reach market size. MSX disease is also caused by a protozoan. It is more virulent than Dermo, although as far as is known, it also kills by reproducing to vast nu ...
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.