LIVEBEARERS T Phallichthys tico - - a dainty new ... - Aqualog

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Aqualognews NUMBER 94 4 Rivulus ornatus,female Aphyolebias peruensis,female biology of such species.The capture of these fishes for live maintenance poses no problems from a conservation viewpoint, so there is really no need to have a guilty conscience about buying wild-caught specimens. Seasonal fishes and survival specialists All the species discussed here live under extreme conditions in the wild. For starters, there are the classic seasonal fishes, including Austrolebias schleseri, A. peruensis, and Moema cf. pirana.Seasonal fishes is the term used for killifishes that in the wild sometimes inhabit waters that dry up the periodically. A feature they have in common is the ability to grow incredibly rapidly: from hatching to sexual maturity takes only a few weeks. And Moema cf. pirana, for example, Rivulus ornatus,male Aphyolebias peruensis,male can readily reach 15 cm long! But others, such as Austrolebias schleseri,attain barely 5 cm in length. From the moment that they attain sexual maturity these fishes mate every day. The species discussed here are bottom-divers, ie the spawning pair dive
Aqualognews NUMBER 94 5 right into the substrate of the body of water and lay their eggs “underground”. In the wild the lifespan of such fishes is usually only a few months. Then their home waters dry up and they die. Only the eggs Moema cf.ortegai,male Rivulus retrocaudatus,male survive in the substrate and hatch many months later when it next rains. They live considerably longer in the aquarium. Moema cf.ortegai,female Rivulus retrocaudatus,female Rivulus, the “grasshoppers” The strategy of the Rivulus species is quite different. These slender fishes have learned to travel on land. In wet weather they jump out of the water and cling to damp terrestrial plants. In this way they significantly reduce predation pressure from piscivorous fishes and can simultaneously colonize small waters that in fact hardly deserve the name, such as damp meadows containing a few small puddles. These fishes live considerably longer than their fellow killies, the seasonal fishes. Rivulus are adhesive spawners that lay their eggs on plants, among fine roots, etc. The eggs usually develop within 2-3 weeks. Because Rivulus are particularly fond of mosquito larvae they are of great interest for the biological combating of mosquitoes.
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LIVEBEARERS T Phallichthys tico - - a dainty new ... - Aqualog

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