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Jenynsia Lineata
SCIENTIFIC NAME: Jenynsia lineata. SYNONYMS: Jenynsia nzaculata, J.pygogramma. DESIGNATION: Tropical. GEOGRAPHICAL DISTRIBUTION: From Brazilsouthwards to northern Argentina. SIZE: Males around 4 cm (1.5 in), femalesaround 6 cm (2.5 in) although largerspecimens are occasionally reported. WATER PREFERENCES: Mature water seems tobe preferred by this species, although itschemical properties in terms of pH and hardness do not appear to be too critical aslong as extremes are avoided. Coolishtemperatures around 22-24°C (c. 73-75°F) arequite adequate. DIET: Will accept a wide range of foods whichshould include a regular livefood component. BREEDING: As its common name implies,Jenynsia lineata is characterised by the malesbeing able to direct their gonopodium in onedirection only. The dextral/sinistralrelationship described for Anableps, therefore, applies equally to Jenynsia, as doesthe tubular nature of the gonopodium with itsrays twisted around each other (but much lessso in Jenynsia).One marked difference between the twospecies is that Jenynsia females ovulate afterthe eggs have been fertilized. The embroyosthen complete their development in theovarian cavity where they are nourished byoutgrowths from the females' ovarian wall,extensions of which (trophonemata) passthrough the embryos' gill aperture and aredirected anteriorly, past the tongue, untilthey protrude from the mouth. DESCRIPTION: Although it wasbelieved for some time that there wereseveral species of One-sided Livebearer, themare now regarded as being synonyms of asingle species. J. lineata can be quarrelsome and is,therefore, not ideal for a communityaquarium. It does best in a thickly plantedaquarium with good aeration. |
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COMMON NAME: One-sided Livebearer.