Essays about: "Halichoerus grypus"
Showing result 1 - 5 of 7 essays containing the words Halichoerus grypus.
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1. Temporal trends of Polybrominated diphenyl ethers (PBDE) and Hexabromocyclododecane (HBCDD) in Swedish Otter (Lutra lutra) and Grey Seals (Halichoerus grypus)
University essay from Lunds universitet/Centrum för miljö- och klimatvetenskap (CEC)Abstract : Polybrominated diphenyl ethers (PBDE) and hexabromocyclododecane (HBCDD) are brominated flame retardants. These compounds are lipophilic, persistent and have been shown to bioaccumulate. READ MORE
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2. Development of northern pike (Esox lucius) populations in the Baltic Sea, and potential effects of grey seal (Halichoerus grypus) predation
University essay from SLU/Dept. Of Aquatic ResourcesAbstract : Worldwide, marine mammal populations are increasing after considerable efforts to turn the downward trends caused by hunting, accidental mortality and pollution. The ecosystem effects from the increases of these top predators may be pronounced, but are in most cases poorly known. READ MORE
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3. Impact of Great cormorant (Phalacrocorax carbo sinensis) on post-smolt survival of hatchery reared salmon (Salmo salar) and sea trout (Salmo trutta)
University essay from SLU/Dept. of Wildlife, Fish and Environmental StudiesAbstract : To compensate for the losses due to altered stream habitat large amounts of hatchery-reared Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) are released into the Baltic Sea each year. During the last decades there have been an overall declining trend in the post-smolt survival of both hatchery reared and wild salmon in the Baltic Sea. READ MORE
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4. Analysing the seal-fishery conflict in the Baltic Sea and exploring new ways of looking at marine mammal movement data
University essay from SLU/Dept. of Wildlife, Fish and Environmental StudiesAbstract : A comprehensive analysis of the available data reveals that there is currently not enough information for making informed management decisions regarding the seal-fishery conflict in the Baltic Sea. Knowledge of hidden and visual damages is limited, which means that the actual cost to the fishing industry from damages is not known. READ MORE
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5. Attack behavior and presence of grey seals around pots : a search for seal-safe cod-pots in the Baltic sea
University essay from SLU/Dept. Of Aquatic ResourcesAbstract : The seals and the fishery are forced to share the role as top-predators in the Baltic waters since they both depend on the same fish stocks, which leads to an unavoidable competition. Seals are raiding traps, leading not only to costly damaged fishing gears and loss in fish catch but also to the seals themselves getting caught and drowned in the gears as by-catch. READ MORE