Largemouth bass
Micropterus salmoides
Also known asBucketmouth
Water parameters
Minimum tank: 400 L per individual at harvest size.
Feed and growth
- Feed protein
- 42% target
- Daily feed (warm)
- 1.20% of body weight
- Daily feed (cool)
- 0.50% of body weight
- Max density
- 30 g per litre
A 1500 g adult eats about 18.0 g of feed per day at optimum. 10 fish at adult size: ~180 g daily.
Legality
Rules vary by jurisdiction and change over time. Verify with your local fisheries or wildlife authority before stocking.
| Jurisdiction | Status | Notes |
|---|---|---|
| California | permit required | Aquaculture registration required for commercial scale verified 2026-05-13 |
| Texas | permit required | verified 2026-05-13 |
| Florida | permit required | verified 2026-05-13 |
| European Union (bloc) | prohibited | Listed on EU Union List of Invasive Alien Species (Regulation 1143/2014) source verified 2026-05-13 |
Unlisted jurisdictions default to "check local regulations".
Origin and habitat
Native to eastern North America, from the Great Lakes south through the Mississippi basin to the Gulf of Mexico and into northern Mexico. Introduced worldwide for sport fishing, making it one of the most widely distributed freshwater game fish. The species (Micropterus salmoides) is a warm-water predator found in lakes, ponds, and slow-moving rivers with structure (submerged wood, vegetation, rock). Wild adults feed primarily on other fish, crayfish, and large invertebrates. In aquaculture, largemouth bass can be trained to accept pelleted feed when started as small fingerlings (under 5 cm), but the transition from live food to pellets has a variable success rate. Some individuals never fully convert, and feed training is the main bottleneck in bass culture. Once trained, they grow well on commercial pellet and produce firm, mild white flesh.
Climate and outdoor ponds
- Climate
- temperate (handles seasonal swings)
- USDA zones
- 4–10 (winter low around -34°C or warmer)
- Heating needed
- no
- Cooling needed
- no
Care notes
A niche aquaponics species for keepers who want a premium-value fish and can tolerate the slow growth rate. Bass take 18-36 months to reach harvest size (400–600 g), which is significantly slower than tilapia or catfish. They're also less tolerant of crowding; stocking density should stay below 15 g/L, ideally 8-12 g/L. The predatory nature means you cannot mix size classes: larger bass eat smaller bass without hesitation. All fish in a single tank should be within 20% of each other's body length. Grade regularly and separate sizes. Feed: high-protein (42-48%) floating pellet designed for bass or trout. FCR is 1.5-2.0 when fully trained on pellets. Fingerlings must be trained to eat pellets early in life; bass that grow past 8–10 cm on live food are extremely difficult to wean and many never accept pellets. Source 'feed-trained' fingerlings from hatcheries that specifically produce pellet-weaned stock. Water temperature range is broad (10–30°C), with optimal growth at 24–28°C. Most US states require an aquaculture permit for largemouth bass, and some require fingerlings sourced from approved in-state hatcheries to prevent genetic contamination of wild recreational fisheries. Check your state wildlife agency regulations before ordering fingerlings.