ABSTRACT: The largetooth sawfish Pristis pristis is a Critically Endangered, once widespread shark-like ray. The species is now extinct or severely depleted in many former parts of its range and is protected in some other range states where populations persist. The likelihood of collecting substantial new biological information is now low. Here, we review all available life history information on size, age and growth, reproductive biology, and demography as a resource for population assessment and demographic modelling. We also revisit a subset of historical data from the 1970s to examine the maternal size-litter size relationship. All available information on life history is derived from the Indo-West Pacific (i.e. northern Australia) and the Western Atlantic (i.e. Lake Nicaragua-Río San Juan system in Central America) subpopulations. P. pristis reaches a maximum size of at least 705 cm total length (TL), size-at-birth is 72-90 cm TL, female size-at-maturity is reached by 300 cm TL, male size-at-maturity is 280-300 cm TL, age-at-maturity is 8-10 yr, longevity is 30-36 yr, litter size range is 1-20 (mean of 7.3 in Lake Nicaragua), and reproductive periodicity is suspected to be biennial in Lake Nicaragua (Western Atlantic) but annual in Australia (Indo-West Pacific). There was a weak relationship between litter size and maternal size in Lake Nicaragua, and lifetime reproductive output for an individual female from Lake Nicaragua was estimated as 73 pups. Future demographic models should aim to capture the variability and uncertainty in life history parameters for P. pristis and we encourage a conservative approach to any application for conservation and management.

中文翻译：

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极度濒危的大齿锯鱼的生活史：人口评估和人口统计学数据汇编

摘要：大齿锯鱼Pristis pristis是极度濒临灭绝的，曾经广泛传播的鲨鱼般的射线。现在，该物种在其范围的许多先前部分已灭绝或严重枯竭，并在一些种群持续存在的其他范围州受到保护。现在，收集大量新的生物学信息的可能性很小。在这里，我们回顾了有关大小，年龄和生长，生殖生物学和人口统计学的所有可用的生命史信息，作为人口评估和人口统计学建模的资源。我们还回顾了1970年代的历史数据的一部分，以检查孕产妇产仔数与产仔数之间的关系。关于生活史的所有可用信息均来自印度西部太平洋地区（即澳大利亚北部）和西部大西洋地区（即中美洲的尼加拉瓜-里奥圣胡安湖系统）亚群。梨达到最大尺寸至少705厘米的总长度（TL），出生时的尺寸为72-90厘米TL，雌性的成熟尺寸达到300厘米TL，雄性的成熟尺寸为280-300厘米TL，成熟年龄为8-10岁，寿命为30-36岁，窝产仔数范围为1-20（尼加拉瓜湖平均为7.3），并且尼加拉瓜湖（西部）的生殖周期被怀疑为两年一次大西洋），但每年在澳大利亚（印度西太平洋）。尼加拉瓜湖的产仔数与产妇大小之间的关系很弱，据估计，尼加拉瓜湖的一名雌性个体的终生生殖产量为73头幼仔。未来的人口统计学模型应旨在捕获P. pristis生活史参数的变异性和不确定性 我们鼓励对任何养护和管理申请采取保守的态度。