New fish species are being reported outside the frontiers of their natural territory. The Bay of Bengal with its adjacent coastal waters is an ideal habitat for diversified fish species. Recently, two dragonet species belonging to the Callionymidae family were discovered from the inshore coastal waters in the southern region of the Bay of Bengal, constituting a new record in the territorial waters of Bangladesh. After observing a specimen of callionymid species in a landing center, six sampling points were selected to confirm the presence of the species and the survey continued for six months. With the hauling of set bag nets and gill nets by fishermen, a total of 13 specimens of dragonets were captured from five sampling sites over the sampling period. The species, identified as Callionymus carebares and Callionymus profundus based on their morphological features, are not native to the region. We confirmed 9 specimens of C. carebares and 4 specimens of C. profundus in the laboratory with body weight ranging between 7.29–19.63 g and 5.2–9.83 g, respectively. Though the definite reasons of their occurrence in this new territory are yet to discover, the species C. carebares possibly migrated from the nearest native habitat in southwestern coastal regions of India; on the other hand, C. profundus, has only been previously reported from the northern regions of the Red Sea in Israel.

据报道，新的鱼类物种不在其自然领土的边界之内。孟加拉湾及其邻近的沿海水域是多种鱼类的理想栖息地。最近，在孟加拉湾南部地区的近岸沿海水域发现了两个属于Callionymidae科的小龙虾，这在孟加拉国领海中创造了新的记录。在登陆中心观察到一个示例性物种后，选择了六个采样点以确认该物种的存在，调查持续了六个月。在渔民拖拉集装袋网和刺网的过程中，在采样期间共从五个采样点捕获了13个小龙虾标本。该物种被鉴定为Callionymus carebares和根据其形态特征，深部Callionymus profundus不是该区域的原生动物。我们在实验室中确认了9个坎care线虫标本和4个深fund线虫标本，其体重分别在7.29–19.63 g和5.2–9.83 g之间。尽管尚未发现它们在这个新领土上发生的确切原因，但C. carebares物种可能是从印度西南沿海地区最近的本土栖息地迁徙而来的。另一方面，C。profundus以前仅在以色列红海北部地区报道过。