The consequences of harmful algal blooms on farm fish mortality and industry in coastal seas of Northern Europe

Vos, T.S. (2023) The consequences of harmful algal blooms on farm fish mortality and industry in coastal seas of Northern Europe. Bachelor's Thesis, Biology.

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Abstract

Harmful algal blooms (HABs) are increasingly frequent in coastal waters around the world. These HABs and are harmful to the health of animals and humans and/or have a negative economic or environmental effect. Although many factors play a role, generally speaking, eutrophication is the most common assumed cause of blooms and their intensity. Other than the intensity, HAB species can be toxic or non-toxic. Toxic species can release lethal toxins effecting marine animals, causing illness and/or death through accumulation of toxins through the food web. Non-toxic algae can crowd out other important algal species and create anoxic environments resulting fish mortality. The aquaculture industry is currently having to cope with HAB’s and the potential worsening of the situation. Aquaculture is a very important industry in Nordic countries, so much so that it equals 2.47% of Norway’s total GDP. Fish farms have already been hit hard by HAB events in the past. The first was in 1988 when Prymnesium  polylepis (Haptophyceae) caused 800 tonnes of fish mortality (mostly salmon) corresponding to a monetary loss of approximately 9 million USD. The worst recorded HAB happened recently, 2019 a Chrysochromulina leadbeateri bloom caused massive fish mortalities and an estimated monetary loss of around 330 million USD. To avoid future HAB’s from blemishing fish harvests, efforts into advancing HAB management strategies like mitigation, prevention and control actions are made. HAB monitoring is c

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Poll, W.H. van de
Degree programme:	Biology
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	03 May 2023 09:56
Last Modified:	03 May 2023 09:56
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/29702

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