1. Public aquaria globally display numerous threatened fish species captured from wild populations. Potential impacts of harvests are rarely evaluated despite the need for improved management and conservation practices.
2. Sawfishes (Family Pristiidae) are one of the world's most at‐risk fish families. Most commonly displayed (30+ wild caught individuals) is the Critically Endangered largetooth sawfish, Pristis pristis.
3. Two Australian aquaria release captive P. pristis to the wild as they outgrow displays, intending to offset impacts of the original harvests. The fate of released sawfish is unknown.
4. Using acoustic telemetry, the behaviour (rates of movement, patterns of habitat use) and survival of aquarium released sawfish (n = 5) were compared to a control group of wild sawfish (n = 5).
5. Aquarium sawfish had reduced rates of movement, were more sedentary, and occupied smaller activity spaces than wild sawfish; but diel activity and habitat use patterns were similar.
6. Collectively, mortality was high. Two aquarium sawfish survived to the end of the monitoring period (391 days and 117 days, respectively), and no wild sawfish survived. The mean duration of survival for aquarium and wild sawfish was 157 and 58 days, respectively.
7. Whilst captivity affected behaviours, the lower mortality rates of aquarium sawfish indicates that releases may partially offset the impact of the original harvest. Further data are required to investigate potential long‐term ecological impacts.
8. If P. pristis are to be used for aquarium displays, the best conservation outcomes could be achieved by harvesting in the first year of life when natural mortality is highest, followed by release into the freshwater reaches of the natal river where predation risk may be minimized. Size on release should be less than ~2,800 mm total length to allow for migration from the river system as part of their natural life cycle.

中文翻译：

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从公共水族馆释放的大齿锯鱼Pristis pristis的运动行为和生存

1. 全球公共水族馆展示了从野生种群中捕获的众多濒危鱼类。尽管需要改进管理和保护措施，但很少评估收成的潜在影响。
2. 锯fish（Pristiidae家族）是世界上风险最高的鱼类家族之一。最常见的展示（超过30个野生捕获个体）是极度濒危的大齿锯鱼Pristis pristis。
3. 两只澳大利亚水族箱在繁殖场上生长时，将其释放到野外，以抵消原始收成的影响。被释放的锯鱼的命运是未知的。
4. 使用声学遥测，行为（运动速度，栖息地的使用模式）和水族馆发布的锯鳐的生存（ñ = 5）相比，野生锯鳐（对照组的ñ = 5）。
5. 与野生锯鱼相比，水族馆锯鱼的活动速度降低，更久坐，活动空间更小；但是diel活动和栖息地使用方式相似。
6. 总体而言，死亡率很高。到监测期末（分别为391天和117天），有两个水族馆锯鱼得以幸存，没有野生锯齿鱼得以幸存。水族馆和野生锯鱼的平均生存时间分别为157天和58天。
7. 虽然圈养会影响其行为，但水族馆锯鱼的死亡率较低，这表明释放可能会部分抵消原始捕捞的影响。需要更多数据来调查潜在的长期生态影响。
8. 如果将P. pristis用于水族箱展示，最好的保护效果是在自然死亡率最高的生命的第一年进行收获，然后释放到纳塔尔河的淡水河段，从而将捕食的风险降到最低，从而达到最佳的保护效果。 。释放尺寸应小于总长度约2800 mm，以允许从河流系统迁移到自然环境中。