Can Pacific Sturgeon and Spotted Gar Live Together?

Pacific Sturgeon is a generally mild-mannered species (3/10), while Spotted Gar is moderately assertive (6/10). This modest difference means Spotted Gar may occasionally assert dominance over Pacific Sturgeon.

In terms of spatial distribution, Pacific Sturgeon prefers the Bottom (Substrate) zone, whereas Spotted Gar occupies the Top (Surface) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.

Additional behavioural considerations to keep in mind: Hyperactive swimmers can stress shy, slow-moving species through constant motion. Aggressive eaters may outcompete shy fish for food, leading to malnutrition.

Worth noting: Spotted Gar is a known jumper, so a tight-fitting lid is essential.

To improve the chances of a peaceful coexistence in this community tank: A larger aquarium with ample hiding spots can help diffuse aggression and give the less dominant fish space to retreat.

The safe temperature window for both species falls between 15°C and 22°C. Aim for the midpoint of this range (around 18.5°C) for optimal comfort.

Both fish can tolerate a pH between 6.5 and 8. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 5–20 dGH. Regular testing will ensure conditions stay within this range.

To house Pacific Sturgeon and Spotted Gar together, plan for an aquarium of at least 20000 litres with a minimum length of 600 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.

Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.

Specific environmental needs for this combination include: Sand (Sifters), Smooth Gravel (Sensitive Barbels), Plants - Floating. Meeting these requirements will help both species thrive.

Pacific Sturgeon prefers High (River/Stream) flow while Spotted Gar needs Low (Still Water) flow. Consider positioning filter outlets and using baffles to create zones of different current intensity within the same tank.

This pairing usually fails when the tank is treated like a standard mixed community and the caution flags are ignored. Pacific Sturgeon and Spotted Gar need extra room, more cover, and closer observation during the first few weeks so small aggression, feeding, or territory issues do not snowball into a long-term problem.

Feeding time deserves special attention with this pairing. Pacific Sturgeon is an aggressive eater that may prevent Spotted Gar from getting enough food.

Because Pacific Sturgeon is a fast, competitive feeder, consider using sinking pellets or feeding at opposite ends of the setup to ensure Spotted Gar receives an adequate share.