The spatfall of mussels on artificial collectors sustains the production of ~350,000 t of mussels per year in Chile, which is known as “capture based aquaculture” (CBA), although little is known about the processes that determine a successful or unsuccessful spatfall. We studied the vertical variability of the larval supply and spat of Mytilus chilensis, Choromytilus chorus and Aulacomya atra in a marine farm located in one of the most important fjords used for spatfall in Chile. Larval supply was sampled five times per day (between 8 am and 6 pm) on three dates, in four depth strata between 0 and 13 m. Environmental variables from the water column were also recorded during each sampling. The spatfall was sampled monthly from December 2014 to June 2015 in the same four depth strata by installing 13 m long collectors in the study area. Larval supply of the three Mytilidae species showed few clear patterns, although the water column showed wide variability in temperature, dissolved oxygen, salinity, and sigma-t. The spatfall of M. chilensis and A. atra showed almost homogeneous vertical distribution at first. However, after six months, a stratified distributional pattern of spat emerged, with M. chilensis dominating between 0 and 7 m depth, and A. atra dominating between 7 and 13 m depth. In both species there was ~90% spat loss in six months from their maximum abundance, which needs to be studied. Our results suggest low production efficiency of spatfall in the study area and we concluded that improving the efficiency of spat collection and monitoring mussel spatfall is a priority, including their potential relationship with natural beds in the vicinity.

贻贝在人工捕捞上的捕捞量使智利每年维持约35万吨贻贝的生产，这被称为“捕捞型水产养殖”（CBA），尽管鲜为人知的成功决定捕捞成功或失败的过程知之甚少。我们研究了Mytilus chilensis，Chromytilus chorus和Aulacomya atra的幼虫供应和吐出物的垂直变化。在位于智利最重要的峡湾之一的海洋农场中。每天在三个日期（0到13 m之间的四个深度层）中，每天五次（上午8点至下午6点之间）采样幼虫供应。在每次采样期间，还记录了水柱的环境变量。通过在研究区域内安装13 m长的收集器，从2014年12月至2015年6月每月在相同的四个深度层中取样。尽管水柱显示出温度，溶解氧，盐度和sigma-t的宽泛变化，但三种Mytilidae物种的幼体供应几乎没有清晰的模式。M. chilensis和A. atra的spa首先显示出几乎均匀的垂直分布。然而，六个月后，出现了分层的吐口分布模式，智利分枝杆菌在0至7 m深度处占主导地位，A。atra则在7至13 m深度处占主导地位。在这两个物种中，从其最大丰度开始的六个月内，约有90％的鱼卵流失，这需要进行研究。我们的结果表明研究区的spa鱼生产效率低，我们得出结论，提高of鱼收集效率和监测贻贝的t鱼养殖是当务之急，包括它们与附近自然床的潜在关系。