EARLY MORPHOGENESIS AND ESTIMATION OF RESOURCES OF BOTIA ROBUSTA IN THE LAIBIN SECTION OF HONGSHUIHE RIVER

We investigated larval and eggs resource of Botia robusta at Laibin section in the Hongshuihe River from mid of April 2017 to August, and found that Botia robusta was the dominant species of collected eggs. We studied the ontogeny of Botia robusta from the Tail bud to Juvenile phase and described the features of 14 developmental stages respectively. The egg membrane was non-adhesive, averaging 6.8 mm. One chamber air bladder was 7.1 mm in total length and the muscle nodes were about 33 pairs. It took 20d to finish the Yolk-sac larva phase stage, spawning mainly from May to June. The total number of the eggs laid at Laibin section in 2017 was about 2.23×10⁸. The correlation analysis between oviposition and major environmental factors found significant correlation between the water temperature with the spawning dynamics (P<0.05).