Adjusting the composition of species in production (i.e., product switching) is a strategy commonly adopted by fishers to mitigate income fluctuations. However, the overall effects of such strategies on individual fishers' economic performance are not well understood. This article examines how catch, revenue and productive efficiency are associated with product switching in the presence of a major stock collapse in the fishery. The data were compiled from a daily record of individual operations in a small-scale fishery during a period when the stock of one key species collapsed. We find that fishers generally tended to persist with a particular product mix. However, the stock collapse forced fishers to reassess their product mix across wild-caught and farmed species or to exit entirely from the fishery. Adjusting product mix helped the remaining fishers to mitigate the reduction in income, but is associated with a loss of efficiency. Although the availability of alternative species served as a buffer against major fishery collapse, product switching may undermine the efficiency of resource use, while threatening the sustainability of substituted species.

调整生产中的物种组成（即产品转换）是渔民通常采用的一种策略，以减轻收入波动。然而，此类策略对个体渔民经济表现的总体影响尚不清楚。本文研究了在渔业中存在重大种群崩溃的情况下，捕获量、收入和生产效率如何与产品转换相关联。这些数据是根据一个关键物种种群数量锐减期间小规模渔业个体作业的每日记录编制的。我们发现渔民通常倾向于坚持使用特定的产品组合。然而，种群崩溃迫使渔民重新评估野生捕捞和养殖物种的产品组合，或者完全退出渔业。调整产品组合帮助剩余的渔民减轻收入减少，但与效率损失有关。尽管替代物种的可用性起到了防止主要渔业崩溃的缓冲作用，但产品转换可能会破坏资源利用的效率，同时威胁替代物种的可持续性。