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Effect of salinity on fresh water fish
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• Fresh water has little salt concentration, organism can live in this water and adapt cells on the concentration of medium salt level.
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Freshwater fish
• Freshwater fish are those that spend some or all of their lives in fresh water, such as rivers and lakes, with a salinity of less than 0.05%.
• These environments differ from marine conditions in many ways, the most obvious being the difference in levels of salinity. To survive fresh water, the fish need a range of physiological adaptations.
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Aim of work
• An experiment how can it adapt in different concentration of salt and effect on Physiological response of fish.
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• Identify ability some fresh water fish can accliumatized in differ of concentration of salt
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Materials
• Goldfish• large beaker• Concentration of salt(5%, 15% and 60% and fresh water).
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Procedure
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Procedure
1. Carefully remove a fish from the tank and place it in a beaker that is half filled with the water from the tank that held the fish.
2. Preparation of solutions ( 5%, 20% and 60% of salt) and fresh water (Control).
3. Placed in each basin fixed number of fish.4. Experience relay daily and recorded the
number of death in each concentration.
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Observation
Solution60%
Solution15%
Solution 5%
Control Day
L D L D L D L D 1
2
3
4
5
6
D= deathL=Live
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Prepared by Abeer Alhabash