Hello,

You might have already read the article of Ashley D. Ficke, Christopher A. Myrick, Lara J. Hansen: "Potential impacts of global climate change on freshwater

fisheries"

Another suggestion is: 'Climate Change Effects on Hydroecology of Arctic Freshwater Ecosystems" by Terry D. Prowse, Frederick J. Wrona, James D. Reist, John J. Gibson, John E. Hobbie, Lucie M. J. Lévesque, and Warwick F. Vincent

And also: "POTENTIAL EFFECTS OF CLIMATE CHANGE ON SURFACE-WATER QUALITY IN NORTH AMERICA" Peter S. Murdoch, Jill S. Baron, Timothy L. Miller

Thanks Byala.I will check them.

In Sri Lanka, culture-based fisheries (CBF) essentially involve stocking of hatchery reared fingerlings of major carps in non-perennial reservoirs after monsoonal rains during December-January and subsequent harvesting when reservoir water level recedes in August-September. As water availability of reservoirs is dependent on the monsoonal rains, one of the major factors influencing the sustainability of CBF in non-perennial reservoirs is annual rainfall pattern.

Long term simulation of water volumes of 25 reservoirs and those associated in the cascades in 4 agro-ecological zones of Sri Lanka indicated that there were different reservoir filling patterns within and between agro-ecological zones. Also, there were different temporal changes of reservoir filling patterns in the recent past in different agro-ecological regions of the country due to shifting of rainfall patterns. As a result, CBF farmers are compelled to change the routine stocking and harvesting calendar in non-perennial reservoirs. However, fingerling availability for stocking at the correct time of reservoir filling cannot be assured as induced breeding of major carps and community-based fingerling rearing procedures are dependent on gonadal maturity cycles of fish, which are usually related to monsoonal rainfall. Due climate change, the monsoonal and intermonsoonal rainfall patterns have changed affecting this process too.

Please refer to this website

http://www.enaca.org/modules/podcast/programme.php?programme_id=7

This contains many cases studies and research findings on the impact of climate change in the asia pacific region. Many documents, policy briefs, presentations etc can be found.

S.M.A.: "What has been the effect of climatic variability on freshwater fisheries? "

Is this a question?

Najim, thanks for the insight.

Zsolt, what do you mean by that response " Is this a question?". What do you think it is?, or you think it is a needless question with obvious answers/responses. Please come again.

S.A.: "Zsolt, what do you mean by that response " Is this a question?""

By " "Is this a question?" " I mean: "Is this a question?".

Zsolt, If you care to know/to be educated, the question is a question in every right sense. Get that straight.

I hope your question is related to observed impacts/ projected impacts of climate change/climate variability on freshwater fisheries? If so, there are few examples as follows:

- freshwater fish population may increase or decrease in abundance (depending on locations and regions) since growth, metabolism, food consumption, and reproductive success can be impacted from the rise of global temperatures

- bioaccumulation of pollutants /toxicants (e.g. uptake of pollutants such as mercury, cadmium, lead) in fish may be enhanced in rising temperatures

- fish in temperate and polar areas can be benefited since a rise of temperature would extend the growing season and can reduce overwintering stress

- rising temperature may increase susceptibility of fish to diseases since bacterial disease often peak at high temperature

- increase in temperature would cause a decrease in dissolved oxygen (DO) supply and a decrease level DO may affect fishes growth, survival and reproductive success

- tropical rivers and streams may experience high evapotranspiration or faster water loss (due to rise of temperature) resulting low flows thus fish can be disposed in a more crowded and stressful conditions in small refuge pools

- rise of temperature may enhance proliferation of algal blooms and bioaccumulation of algal toxins in edible part of freshwater fish (note: some algae called cyanobacteria or blue green algae produce harmful toxins such as microcystins)