Half beak care? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 2 Old 06-07-2011, 11:17 PM Thread Starter
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Half beak care?

Are half beaks actuly freshwater fish or are they brackish?
Are they compatible with other live bearers like platys/swordtails in larger set-ups or, do they need a species tank?
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post #2 of 2 Old 06-10-2011, 03:07 PM
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There are a few species of halfbeak, the most common is probably Dermogenys pusilla which is fine in freshwater provided it is hard and somewhat alkaline. It can also be maintained in semi-brackish, but this will restrict other fish and some plants. And this fish should be in a well-planted tank, particularly floating plants. It is a good jumper, and very skittish, so plants calm it.

I've not kept this fish myself, but I understand it is fine with other fish that are peaceful and can manage in the same water (whichever you provide). In hard freshwater, livebearers work. In brackish, mollies would be best. Halfbeaks are perhaps best in a group, and this means a 20g or larger. Males will "wrestle" but rarely cause damage, and a group allows the fish to be more itself and not as panicky.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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