Salinity effect on freshwater fishes
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Transcript of Salinity effect on freshwater fishes
Salinity effect on freshwater fishes
Done by: Sumaiah AlghamdiHind alsubeie
Submitted to T: Alanood
Content
• Introduction • Material and methods• Result • Discussion • References
Introduction • Salinity is one of the important environmental
factors affecting survival, growth and distribution of many aquatic organisms optimal salinity levels for growth, survival and reproduction competence are often species–specific (1)
• In this study we try to find out the ability of freshwater fishes in adaptation for salinity by measuring different concentration of salinity which affect the physiological function of the fishes bodies.
Material and methods
Material :• 3 aquarium in each one 2 fishes .• The first one is control • The second one with 5% salt in
1000 ml water + 150 g NACL salt • The last one with 15% sal in 1000
ml water + 50 g NACL salt Method:• Watch the experience every day
with and write the changes and deaths in each aquarium during 7 days.
Result
Day and date
Aquarium 15% Nacl
Aquarium 5%Nacl Control Note
D L D L D L Day 1 2 2 2
Day 2
Day3
Result
Physiological changes• Low energy• Rigidity in the body• Loss of scales• Secretion of substances from the body• Death
Result
Discussion • As the result showed that some Changes in
salinity can effect biota in freshwater directly or indirectly .
• the major limiting factor affecting the survival of freshwater fishes is seawater and exposure to salinities greater than about 9% is Absence of efficient efficient branchial and renal mechanisms osmotic stress which increase osmotic pressure and deterioration of cell function also this effect accompanied by changes in Na+ K+ ATPase activity ,Co2 level and acid-base balance(3)
Any question
Thank you
References
• Effect of salinity on survival and growth of giant freshwater prawn Macrobrachium rosenbergii (de Man)B.K. Chanda, R.K. Trivedib, S.K. Dubeyb,∗, S.K. Routb, M.M. Bega, U.K. DasbaDirectorate
• Effect of increasing salinity on freshwater ecosystem in Australia . D.L .Nielsen ,M.A.Brock , G.N.Rees and D.S.Baldwin
• Effects of salinity on freshwater fishes in coastal plain drainages in the southeastern U.S Mark .S.Peterson . Michael .R.Meador