The Daily Age and Hatching Time Estimation of the Schizopygopsis Malacanthus Larvae and Juvenile in Jinsha River Tibet
The morphological and structural characteristics of sagitta lapillus in Schizopygopsis malacanthus were examined using 412 larvae captured from the Jinsha River basin in Tibet in 2019.The daily age was read and hatching time was calculated based on the daily increments technology of otolith.Findings indicate that body length and weight distributions ranged from 12.9∼58.96 mm(31.30±12.05)mm and 0.008∼2.734 g(0.662±0.682)g respectively.The structure of the lapillus is stable and the daily increments is clear,which is the best ma-terial for the identification of daily increments for larvae of S.malacanthus.The distribution range of day age was 12∼139 d(56.19±27.45)d,and the relationship between day age and length was Lt=-0.003D2+0.703D-1.606(n=339,R2=0.9067,P<0.01).It is estimated that the hatching date of S.malacanthus was from April 27 to July 10 in 2019,and the peak was in May.These results provide foundational data for the study of the spawning peri-od and conservation of S.malacanthus resources.
Schizopygopsis malacanthusLarvae and Juvenileday agehatching date
万方数据
维普
