Gonadal Development and Size at First Maturity of Stenothyra sp.
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Abstract
The morphology, sex ratio, gonadal development, and size at first maturity were studied for Stenothyra sp. collected from a stagnant brackish water pond at Samut Songkhram province from January 2018 to February 2019. The size range of Stenothyra sp. were 0.80-3.00 mm in shell length (SL). The shells were of ovate shape, thin, smooth surfaced and dark brown in color. Each shell had 5 dextral whorls. The males, which were longer than 1.60 mm SL, were identifiable due to their conspicuous sex organs. The sex ratio between males and females of Stenothyra sp. was about 0.71:1.00, which was a significant difference (P<0.05). The gonadal development stage of Stenothyra sp. in males and female was classified into 5 stages: resting stage, developing stage, maturing stage, spawning stage, and spent stage. The sizes of individuals at first maturity in each season (summer, rainy, and winter) were studied, and the results were approximately 1.71, 1.71, and 1.63 mm SL, respectively. This study is unique in that it is the first in-depth study of the maturation of the snail. The researchers believe that their methods and results can be applied to the further study of the Stenothyra sp. reproductive cycle, seasonal population dynamics, and to
the utilization of this snail in aquaculture.
Article Details
King Mongkut's Agricultural Journal
References
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