Nuruki Lynn, Miyashima Aki, Agawa Yasuo, Sawada Yoshifumi
Graduate School of Agriculture, Kindai University, Nakamachi 3327-204, Nara 631-8505, Nara, Japan.
Aquaculture Research Institute, Kindai University, Oshima 1790-4, Kushimoto 649-3633, Wakayama, Japan.
Animals (Basel). 2025 Jul 7;15(13):1997. doi: 10.3390/ani15131997.
This study investigated the effects of feeding striped beakfish () newly hatched larvae on the survival and growth of kawakawa () larvae and juveniles, as well as their relative growth patterns. Fertilized eggs of kawakawa were reared in 1 m experimental tanks until 13 days post-hatch (dph). From 3 to 8 dph, larvae were fed enriched rotifers, and from 9 to 12 dph, they were assigned to two experimental groups: one receiving only a formulated diet and the other receiving a combination of the formulated diet and 10,000 striped beakfish newly hatched larvae every day in each tank. The group fed newly hatched larvae exhibited approximately 36% greater growth than the group fed only the formulated diet. However, survival at 13 dph was approximately 34% lower, suggesting that further investigation is needed to determine the optimal feeding quantity of newly hatched larvae. The relative growth patterns of larvae and juveniles reared in a commercial 30 m tank showed morphological traits characteristic of scombrid fish, such as a longer preanal length and upper jaw length. Growth patterns varied at three key body lengths (notochord length or standard length; 3, 8-10, and 30 mm), as well as at their corresponding standard lengths. In kawakawa, the upper jaw exhibited early accelerated growth compared to other scombrid species. This characteristic is believed to facilitate the early onset of piscivory under captive conditions.
本研究调查了用条纹喙鲈（）的初孵仔鱼投喂川鲹（）仔鱼和幼鱼对其存活、生长以及相对生长模式的影响。川鲹的受精卵在1米的实验水箱中培育至孵化后13天（dph）。在3至8 dph期间，仔鱼投喂强化轮虫，在9至12 dph期间，将它们分为两个实验组：一组仅接受配合饲料，另一组在每个水箱中每天接受配合饲料和10000尾条纹喙鲈初孵仔鱼的组合投喂。投喂初孵仔鱼的组比仅投喂配合饲料的组生长快约36%。然而，13 dph时的存活率约低34%，这表明需要进一步研究以确定初孵仔鱼的最佳投喂量。在一个30米的商业水箱中培育的仔鱼和幼鱼的相对生长模式显示出鲭科鱼类的形态特征，如肛前长度和上颌长度更长。在三个关键体长（脊索长度或标准长度；3、8 - 10和30毫米）及其相应的标准长度时，生长模式有所不同。在川鲹中，与其他鲭科物种相比，上颌表现出早期加速生长。据信这一特征有助于在圈养条件下早期开始捕食鱼类。
