Abstract
AbstractAbrupt pH changes from hatchery to pond water may affect survival of Goldfish Carassius auratus fry after stocking. A total of 12 triplicate pH treatments ranging from 3.57 to 11.50 were used to assess a gradient of abrupt pH changes on survival of 3‐d posthatch (dph) Goldfish fry in aquaria during a 24‐h exposure experiment. The experiment indicated that the 24‐h LC10, LC50, and LC90 pH values for 3 dph Goldfish fry was 9.99, 10.52, and 11.08, respectively, based on an initial pH = 8.38. When pH was decreased below 8.38, the 24‐h LC10, LC50, and LC90 occurred at a pH of 4.68, 4.27, and 3.89, respectively. Baitfish farmers should avoid pond water with high pH to reduce fry mortality during the early fry stocking period when the upper lethal pH limit (i.e., LC10, for practical consideration) of 9.99 will become possible.
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