General
Croaking gouramis can reach an average size of about 5 centimeters, though some individuals can grow as large as 6 or 7 centimeters. Coloration is highly variable, ranging from pale brown and green to dark purple with black or red spots on the fins. 2-4 brown or black stripes or rows of spots are present on their sides. Median fins have a thin iridescent blue coloration on their edges. The iris of the eye is bright blue or purple. Females tend to be paler than males, have a slightly rounded dorsal fin and a shorter anal fin. Most croaking gouramis live for about 2 years but with proper care can live as long as 5 in an aquarium setting. They are native to stillwater habitats including ponds, canals and paddy fields in Java, Borneo, Sumatra, Malaya, Thailand, Laos, Cambodia, and Vietnam. A breeding population is known to exist in a series of drainage ditches in Palm Beach County, Florida, USA, almost certainly introduced there through the aquarium industry.
As their name suggests, croaking gouramis are capable of producing an audible grunting or chirping noise, accomplished through the use of specialized adaptations of their pectoral fins. These noises are produced by both sexes during breeding displays and during the establishment of dominance hierarchies among males. A typical showdown between males consists of each fish circling the other, flaring fins, aggressively darting (though rarely making contact), and producing croaking noises. Well matched individuals may continue this behaviour for several hours at a time.
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