Bloch & Schneider 1801
The Cuban gar (Atractosteus tristoechus) is a fish in the family Lepisosteidae. It is found in Western Cuba and the Isla de la Juventud. The flesh of the fish is edible but the eggs are poisonous for humans.
The Cuban gar is a tropical freshwater fish (18 °C – 23 °C), although also inhabits brackish water lives in rivers and lakes and is found in the Demersal zone of Western Cuba and Isla de la Juventud. Cuban gars spawn seasonally in the floodplains of large rivers.
Cuban gar typically hunt alone and avoid other members of their species. The exception to this is during spawning season; instead during this time, larger parties of around 20 gar form to hunt. Sometimes the groups break up into smaller groups and anywhere from 2 to 8 males accompany 1 female. Gar species generally have sex ratios skewed towards males (in the cases of tropical or alligator gar), although research has yet to show this trend in the Cuban gar.
The Cuban gar is around 100 cm in length, but can grow as large as 200 cm. There is no known variance in length relative to sex. This places A. Tristoechus as the second largest extant species of gar, just behind A. Spatula.
The Cuban gar, along with other species of gar is also notable for its high tolerance of high ammonia and nitrate levels in water its ability to breathe some atmospheric air in absence of sufficiently oxygenated water, and its disease resistance.
After hatching, Cuban gar larvae undergo three stages of organogenesis and development: Attached (days 1-3), transitional (days 4-10), and free swimming (days 11-18). During the attached stage, the larvae develop rudimentary intestines, stomachs, pancreases and esophagi that help the larvae transition from feeding off the egg yolk to normal feeding, which begins during the transitional phase. The transitional phase is marked by further development of these organs and a lack of obvious yolk. During this phase teeth also develop. Once there is separation between the stomach and intestines—increased organ size and complexity, and completely exotrophic behavior has arisen—the larvae is considered “free swimming”. While they are larvae, Cuban gar will grow from around 15 mm, in length in the attached phase, to 40mm in length in the free swimming phase.
Like other species of Gar, Cuban gar are top level predators in freshwater ecosystems. Adult Cuban gar feed on freshwater fishes and birds. Young are prey to the introduced large mouth bass (Micropterus salmoides). As an animal with a high trophic level, the Gar has lost much of its population due to overfishing and habitat loss. Attempts to restore natural fish populations using the Gar in aquaculture are in currently in progress, but these ideas have yet to reach implementation.
Cuban gar are currently under research for use in broodstocking, both due to the threatened nature of gar species and due to the potentially valuable role of gar in reducing the pressure of fisheries on natural aquatic ecosystems. No implementation of Cuban gar broodstocking for ecological protection has yet occurred, however.
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