Amazon giant fish must gulp air or drown
Arapaima—also pirarucu or paiche—are among Earth's largest freshwater fishes, bonytongues of Amazon and Essequibo waters that can top three metres. They surface to breathe, so traditional fishers wait, harpoon, and club them. That need for air also makes them acutely vulnerable to overfishing.
Taxonomy is messy. The genus was long treated as one species, A. gigas, yet that name now attaches mainly to old museum material of unclear range; the familiar widespread fish is often called A. arapaima, with FishBase listing four species and evidence for a fifth. Verified lengths exceed two metres and sometimes two point six, with a checked maximum of three point zero seven metres and weights to two hundred kilograms; anecdotes of four point five metres lack verification. A single animal can yield about seventy kilograms of meat.
Life tracks the flood pulse. Nest pits about fifty centimetres wide and fifteen deep are dug in mud as waters rise; colour shifts with breeding. Seasonal flooding shapes growth and parental guarding. Introductions for sport fishing in Thailand and Malaysia produce releases of fish over one hundred fifty kilograms, and odd reports surface as far as Malaysian lake folklore and Cambodian rivers.
Commercial peaks from nineteen eighteen to nineteen twenty-four hauled some seven thousand tons yearly, pushing ribeirinho communities into farming. Catch limits often failed because surfacing giants are easy targets. Gourmet kitchens still celebrate the quarter-ton fish, but conservation hinges on protecting breeding floods and limiting harvest of air-breathing leviathans that cannot hide forever below. Air-breathing giants cannot hide indefinitely from nets timed to the gulp. Community management that guards nesting flats during rising water has a better chance than blanket bans that fishers cannot afford to obey.
Source: Arapaima
