Spotted Gar

The spotted gar (Lepisosteus oculatus) is a large, surface-oriented predatory fish of eastern North America, commonly reaching about 100 cm (FishBase: max 150 cm; ADW: average 76 cm). It is a facultative air-breather that patrols quiet, clear pools and backwaters, ambushing fish and crustaceans. Gars are solitary, territorial and primarily nocturnal, and they live long, slowly growing lives. Everything about the species points to very large, well-filtered, fish-only systems. Confidence note: medium-confidence guidance drawn from published species care information; treat as conservative guidance, not a precise requirement.

Profile sizeCm=100 matches FishBase's common length, though FishBase records a 150 cm maximum and ADW describes adults that rarely exceed 91 cm. Expect slow, sustained growth with big individuals passing a metre, so plan the adult footprint (183+ cm) from day one rather than upgrading later. The long, rigid body needs tank length far more than height. Confidence note: medium-confidence guidance drawn from published species care information; treat as conservative guidance, not a precise requirement.

ADW records the spotted gar as solitary, territorial and primarily nocturnal, spending daylight hours basking near fallen logs in shallow open water. It is an ambush predator: long periods of stillness followed by a fast strike at fish or crustaceans. There is no supported group size - SeriouslyFish advises 'Best kept alone' - so groupSize is deliberately omitted. Confidence note: medium-confidence guidance drawn from published species care information; treat as conservative guidance, not a precise requirement.

fishstores.org specifies a 180 US gal tank of 6x2x2 ft (approx. 183x61x61 cm) for adults, with 24-inch width as non-negotiable; SeriouslyFish rates adult spotties as suitable only for very large public installations. Temperature guidance genuinely conflicts - FishBase/SeriouslyFish give 12-20 °C while fishstores.org reports tolerance of 18-28 °C with 22-26 °C typical - so the profile's 18-24 °C sits inside both ranges and is left unchanged pending research. Water chemistry is comparatively forgiving, but nitrate must stay low because gars are messy eaters; hardness guidance is 5-20 dGH (SeriouslyFish) or 5-15 dGH (fishstores.org). Confidence note: medium-confidence guidance drawn from published species care information; treat as conservative guidance, not a precise requirement.

The 183x60 cm footprint is a practical adult minimum, giving room for the gar's characteristic motionless surface-hanging and short hunting bursts. Keep the length unobstructed - this is an open-water, surface-oriented hunter, not a fish for densely scaped community layouts. Height matters little; horizontal floor length is what the fish actually uses. Confidence note: medium-confidence guidance drawn from published species care information; treat as conservative guidance, not a precise requirement.

Carnivorous: FishBase lists a piscivore that also takes crustaceans, and ADW describes an ambush hunter feeding primarily on aquatic crustaceans such as crayfish. Offer whole fish, shrimp, crayfish and chopped seafood; gars are messy eaters, so feed modestly and siphon uneaten food before it fouls the water. Confidence note: medium-confidence guidance drawn from published species care information; treat as conservative guidance, not a precise requirement.

SeriouslyFish does not consider the spotted gar a community fish, while fishstores.org lists large, robust 'monster fish' as suitable companions. Any tankmate must be too large to swallow and hardy enough to hold its own; small fish are simply food. Invertebrates are regular wild prey, so ornamental shrimp and crabs are snacks, not dither animals. Confidence note: medium-confidence guidance drawn from published species care information; treat as conservative guidance, not a precise requirement.

A spotted gar is a public-aquarium-scale commitment: 183+ cm of tank length, established biological filtration, a tight lid with a small air gap for surface breathing, and heavy but infrequent feeding of meaty foods. The one figure no fetched source settles is temperature - specialist ranges span 12-28 °C - so confirm local advice before committing. Kept to a fish-only, low-nitrate regime it is a striking display predator, but it is the wrong choice for community or intermediate setups. Confidence note: medium-confidence guidance drawn from published species care information; treat as conservative guidance, not a precise requirement.