Encapsulated development with extraembryonic yolk may lead to competition for nutrients within egg capsules. In this research, different degrees of competition among embryos in subtidal egg capsules of Acanthina monodon resulted in considerable differences in hatching size. For newly hatched juveniles, individuals hatching from less crowded egg capsules showed better survival, larger SL, higher rates of oxygen consumption, and higher rates of food consumption. However, by 28 days after hatching, the largest surviving juveniles were the best-performing individuals, regardless of the initial embryo density within the capsules. In summary, more crowded egg capsules resulted in poorer survival. These findings may help to explain the variability seen in juvenile success in some field populations; much of that variation may reflect stressful experiences that the new recruits have had during the early stages of their encapsulated development.

胚外卵黄的包囊发育可能导致卵囊内营养的竞争。在这项研究中，Acanthina monodon潮下卵囊中胚胎之间的竞争程度不同导致孵化大小存在很大差异。对于刚孵出的幼鱼，从较不拥挤的卵囊中孵化的个体显示出更好的生存率，更大的SL，更高的氧气消耗率和更高的食物消耗率。但是，在孵化后28天，无论胶囊内的初始胚胎密度如何，存活最多的少年都是表现最佳的个体。总而言之，更多拥挤的卵囊会导致较差的生存。这些发现可能有助于解释在某些田间种群中，青少年成功的变异性。这种变化的大部分可能反映了新兵在封装式开发的早期阶段所经历的压力大的经历。