Double Extirpation of Eyestalk in Spiralothelphusa Hydrodroma Induced Gonadal Maturation

By : Anne Rebecca A , Prabhavathi R.

Page No: 147-160

Abstract
The suitability of bilateral eyestalk ablation as a means of induced breeding technique in S. hydrodroma was tested under laboratory conditions by considering growth and survival indices, reproductive indices, biochemical and histological indices. The daily growth rate (g) was higher for ablated males (0.3±0.2) against 0.16±0.09 in control males. A positive correlation with feed intake of 0.71±0.04 (g) in ablated males against 0.62±0.84 in control males and a negative correlation with Hepatosomatic Index (%) of 7.02±2.4 against 13.77±3.2 are recorded. Female crabs shows less survival rate (%) compared to males (64±12.7/88±10.33). Ovarian and testicular index in comparison to control were found to be higher (0.2±0.08/0.15±0.02 and 2.6±0.33/1.08±0.06 respectively). Nutrient mobilization was evident from decreased muscular protein and carbohydrates as of hepatopancreatic lipid after extirpation and increased gonadal proteins, carbohydrates and lipids. The double extirpation procedure increased the number of oocytes, follicle diameter and number in females and an increase spermatozoa and spermatocytes in males as reveled by histological indices.

Authors :
Anne Rebecca A and Prabhavathi R.
PG department of Zoology, PSG College of Arts and Science, Coimbatore-641014, Tamilnadu, India.
 

DOI: http://doi.org/10.32381/JAT.2019.34.3-4.2