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This profile was written by Bunny an active contributor to the site.
North America: Jalesco, Mexico. A single spring-fed pool of the Rio Teuchitlán near the Tequila Volcano. The pool is 13 feet (8 meters) in diameter and 3.28 to 4.27 feet (1-1.3 meters) deep.
General Body Form:
A rounded, deep body with fusiform shape. Fins are moderately long and rounded. Small superior mouth. Females are nearly one-third larger than males.
The base coloration of the head, body and fins is dark olivaceous or milky blue-grey with bright flashes of ever-changing iridescence from mosaic scales. The anterior part of the ventral surface is notably muted. A series of dark gray dots extend along the lateral line from the front of the anal fins out to the caudal peduncle. Dorsal and anal fins are blue-grey proximaly and fade to cream along their distal edges. Pectoral fins are translucent. The body of the caudal fin is blue-grey, followed by a wide crescent of saffron, and terminates in a thin band of cream. Females are more muted, lack the cream-colored edges of their dorsal and anal fins and have only a very thin, faint yellow crescent when there is any marking at all.
Easy. Sexual dimorphism: Males are up to 1/3 smaller than female and are more intensely colored. Females are larger and are fuller-bodied. Due to it's rapid disappearance in the wild, little is known about the courtship and the spawning process. Zoogoneticus is most likely to spawn in the summer or winter. The male transfers sperm into the female using the first few spines that are split off from his anal fin (hence the name “splitfin”) and fry develop within her ovary. Uniquely, fry receive nutrients from the mother via a ribbon-like structure and they have a placenta-like attachment on their stomachs. After 6 to 8 weeks, 10-30 fry are born. Fry should be removed from the tank as adult fish will eat them. They are sexually mature and distinguishable in 6 to 10 weeks. Unlike other livebearers, females do not store sperm and must be fertilized for each pregnancy.
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