Peacock Bass Tagging Tracks Amazon Fish Movements
A Brazilian river program has tagged more than 3,000 peacock bass since 2019, revealing how the fish move and grow.
Updated on Nov. 7, 2026 in Fishing
Indigenous guides, researchers, and conservation partners launched an official peacock bass tagging initiative on Brazil's Rio Marié in 2019. The program has tagged more than 3,000 fish, and one was recaptured 117 kilometres upstream from where it was tagged.
Why it matters
The recaptures give scientists direct evidence of how far and how fast these fish move and grow in the Amazon. The findings can inform how anglers and managers think about sustaining the fishery over time.
The program's mark-and-recapture records show a tagged fish recaptured 117 kilometres upstream, while recaptured fish gain roughly 3 to 4 grams per day. Researchers are still refining estimates of growth, age and seasonal movements.
The players
International Game Fish Association (IGFA)
The IGFA is a nonprofit organization that sets recordkeeping and conservation standards for recreational sport fishing worldwide.
The details
Fish are measured for length and weight, photographed, tagged, and released, and recaptured fish are identified by matching body markings with past images alongside the tag number. Most recaptures were found relatively close to their original capture points, though one fish tagged in 2022 turned up about 75 kilometres downstream nearly two years later.
Timeline
2019: Official tagging initiative launched on the Rio Marié.
October 2022: A fish later recaptured about 75 kilometres downstream was tagged.
2023-24 season: A tagged fish was caught, released, and recaptured four more times within 31 days.
2025: A breeding male and female were tagged and later recaptured guarding newly hatched fry about 28 kilometres downstream.
Season Trajectory
The Rio Marié program's multi-year record now spans recaptures from 2022 through 2025, letting researchers compare short-term and long-term movement. Each new season adds data that sharpens estimates of how peacock bass grow and migrate.
Anglers planning trips to Amazon peacock bass waters should expect fish to move considerable distances between seasons, so spot choices may shift year to year. Practical guidance on handling and releasing tagged fish is worth following if one is caught.
The takeaway
Tagged fish records show that peacock bass can travel far and grow steadily, which makes repeated monitoring valuable for understanding the species. Anglers who catch a tagged fish can help by reporting the tag number and releasing the fish.
Further reading
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Source note: This article includes information reported by The Times of India.
