A mesh filter which screws onto the cod end of a plankton net to overcome the problems of organisms depositing on the net when bottles or rubber funnels are used. Organisms caught by the net are deposited on a mesh screen of the same material as the net itself. This can be unscrewed in the field and either washed off into a container for immediate re-use or dropped into a bottle for future examination.
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I don't know how you got a book printed 26 years ago in the conditions that I received it (like new) but you do it! ABSOLUTELY AWESOME!
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