SummaryThe study sought to investigate the chronology of events and timing of embryogenesis, as well as breeding performances of three strains of Heterobranchus longifilis from Nigeria. Fish samples were collected from Benue River in Makurdi, Niger River in Onitsha, and Rima River in Sokoto for this study. Induced spawning of the strains was carried out so that egg development could be tracked from fertilization to hatching using a simple microscope. The microphotographs obtained showed that the embryogenesis of the strains followed a similar pattern to those of other members of the family Clariidae, however with changes occurring in the specific timing of the sequences of events (i.e. interstrain and interspecies differences). When the different strains were compared, the study noted similarities (P > 0.05) in the overall breeding performance (except for fertilization rate), survival at different stages of development, timing of embryogenesis, and larvae characteristics. The outcomes of this study, therefore, provide baseline information on what genetic improvement of the species through strain crossing can be attempted in future studies.

中文翻译：

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三株长枝异鳃在尼日利亚的育种性能及胚胎发育

摘要该研究旨在调查事件的年表和胚胎发生的时间，以及三个品系的育种性能。长枝异鳃来自尼日利亚。本研究从马库尔迪的贝努埃河、奥尼查的尼日尔河和索科托的里马河采集鱼类样本。进行了菌株的诱导产卵，以便可以使用简单的显微镜跟踪从受精到孵化的卵​​子发育。获得的显微照片显示，这些菌株的胚胎发生遵循与Clariidae科其他成员相似的模式，但是事件序列的特定时间发生了变化（即菌株间和种间差异）。当比较不同的菌株时，研究发现了相似之处（磷> 0.05）在总体育种性能（受精率除外）、不同发育阶段的存活率、胚胎发生时间和幼虫特征方面。因此，本研究的结果提供了有关在未来研究中可以尝试通过菌株杂交对物种进行哪些遗传改良的基线信息。