Comparative Study of growth, Cocoon production and Hatching success of Lampito mauritii and Periyonix excavatus cultured in different water Hyacinth Media.
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Rate of cocoon and hatchling production, hatching success, incubation time and body weight changes of adult L.mauritii and P.excavatus kept in different PSR doses of water hyacinth for 30 days were determined to know their reproductive efficiency. Rate of cocoon and hatchling production, hatching success, incubation time and the body weight of adult L.mauritii and P.excavatus exposed to 0, 10, 20, 30, 40, 50, 75 and 100 PSR doses prepared from partly decomposed water hyacinth with soil for 30 days, It is important to note here that though there are changes (negative/positive) in the body weight of all earthworms exposed to water hyacinth, none died during the course of this study. The earthworms kept in soil medium though showed 100% survival value, only 12 L.mauritii and 13 P.excavatus cocoons were produced during this study period. Out of seven PSR doses and two earthworm species studied, L.mauritii kept in 100 PSR dose though produced maximum number of cocoons (402), only 374 hatched after 21–23 days incubation period. Hatching success and hatchling production rate were 93% and 1.01 H/C, respectively. But L.mauritii exposed to lower doses (10–75 PSR) showed lesser hatching success and hatchling production rate values ranging from 80.6 to 92.0% and 0.81 to 0.96 H/C, respectively over 100 PSR value. L.mauritii, P.excavatus also showed a dose dependent effect with lesser cocoon production values in lower doses and higher production values in higher doses. As of the incubation time, L.mauritii cocoons required longer hatching time (20–23 days) than that of P.excavatus (10–13 days for cocoons from 10–30 PSR and 17–18 days for cocoons from 50–100 PSR doses).
Water hyacinth, Perionyx excavatus, Lampito mauritii, Vermiculture, Cocoon production.