Aquaculture: problems we treat | Alchemal

Morning die-offs: the pre-dawn oxygen crash
Stock lost overnight, found at first light. See what causes the pre-dawn oxygen crash and how a continuous reserve prevents the next one.
Low dissolved oxygen: the ceiling on stocking density
Feeding harder for gains that don't come, with the pond closer to a crash each night. Oxygen is usually the ceiling. See how to read the headroom.
Fish that eat but don't grow: feed, oxygen, and FCR
Feed going in without the weight coming out. When oxygen is marginal, the stock converts poorly. See how steadier oxygen returns energy to growth.
Living on paddlewheels: cost, coverage, and the outage risk
Paddlewheels running long hours, more added every season, one outage from a bad night. See how a held reserve changes what the machines must carry.
Black pond bottoms in shrimp culture: the anaerobic sediment
A pond bottom gone black and sour, with soft-shelled shrimp and thin survival. See how oxygen to the sediment keeps the bottom aerobic.
Hatchery and raceway oxygen: the flow-through margin
Dissolved oxygen falling pass to pass, the last raceway running short. See how efficient oxygen widens the flow-through margin.
Biofilter oxygen and ammonia in RAS: the nitrification link
Ammonia creeping up while the biofilter looks healthy. Nitrification is oxygen-limited. See how steady oxygen lets the biology keep pace.

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