Abstract In this study, we designed, applied and evaluated a new methodology to estimate the direct fecundity of Lithodes santolla ovigerous females that can be applied during fishing expeditions or independent monitoring. Eighty-five ovigerous females were collected from the fishery and 24 high-resolution images of each egg mass were used to estimate the egg mass volume using three dimensional (3D) modeling in the laboratory. Second, the carapace length, clutch volume, number of eggs per clutch, and egg sizes were recorded for each ovigerous female. Third, the relationship between the observed clutch volume and the estimated volume from the 3D model was evaluated, in addition to the relationship between fecundity and clutch volume using linear models. Finally, two imaging surveys were carried out on fishing boats, resulting in 46 photogrammetric surveys (representing 46 ovigerous females). In the laboratory, the 3D modeling of clutch volume was successful in 66 ovigerous females (77 %), and explained 99 % of the variance when estimating the observed clutch volume. The most informative model for estimating fecundity was a linear model which explained 88 % of the variance and included carapace length as a covariable. This could be related to egg size, which should be studied in more detail. From the images obtained on fishing boats, the 3D modeling and fecundity estimates were successful for ∼62 % of clutches. This non invasive method for estimating fecundity presents an opportunity to improve the estimation of per capita reproductive contribution in female Lithodidae crustaceans through monitoring, although the photogrammetric survey process on fishing boats needs improvement.

中文翻译：

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使用基于 3D 图像的体积模型估计 Lithodes santolla 的繁殖力：改进 Lithodidae 甲壳类动物监测的工具

摘要 在这项研究中，我们设计、应用和评估了一种新的方法来估计 Lithodes santolla 产卵雌性的直接繁殖力，该方法可用于捕鱼探险或独立监测。从渔业中收集了 85 只产卵雌性，并在实验室中使用 3D (3D) 建模使用每个卵质量的 24 张高分辨率图像来估计卵质量体积。其次，记录每个产卵雌性的背甲长度、离合器体积、每个离合器的卵数和卵大小。第三，除了使用线性模型评估繁殖力和离合器体积之间的关系之外，还评估了观察到的离合器体积与来自 3D 模型的估计体积之间的关系。最后，在渔船上进行了两次成像调查，导致 46 次摄影测量调查（代表 46 只雌性雌性）。在实验室中，离合器体积的 3D 建模在 66 只产卵雌性 (77%) 中成功，并且在估计观察到的离合器体积时解释了 99% 的差异。估计繁殖力的最有用的模型是线性模型，它解释了 88% 的方差，并将甲壳长度作为协变量。这可能与鸡蛋大小有关，应进行更详细的研究。从在渔船上获得的图像来看，3D 建模和繁殖力估计对约 62% 的离合器是成功的。这种估计繁殖力的非侵入性方法提供了一个机会，可以通过监测来改进对雌性石斑鱼甲壳动物人均繁殖贡献的估计，