How to control bacterial scum from mosquito rearing trays with out affecting them ?
In rearing trays where scum formation is observed, it may be necessary to remove some of the water and film and add clean water to the rearing tray.
Please find attached document as well
Abhirup Saha, I check my rearing trays daily. If there's scum formation, I drag a paper towel across the surface which removes it. The larvae sink to the bottom, so they don't get dragged away. I'm sure there's probably a better method but this works nicely for me. Good luck!
A few ideas for you. Try to use fish food low in fat content. Oxygenate the water as per fish aquariums. Run paper towelling across the surface of the water daily. Reduce the amount of food. Replace some of the water daily.
Dear Abhirup,
If you use larval food in optimal quantity ( as per the larval densities and instars) in the rearing trays and change the water of larval rearing trays on alternate days the problem of scum formation will not be there / will be reduced to a great extent.
Best of luck.
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