Abstract

The effect of irradiation with non-coherent and non-polarized light on eclosion rate, survival and growth of juveniles of Melongena corona bispinosa in laboratory conditions were determinated. Eggs capsules were placed in one liter beakers. Five experiments were conducted: four treatments were irradiated for 10 minutes and one that was not irradiated (control group); each treatment was duplicated. The first treatment was irradiated for seven days, the second for 14 days, the third for 21 days and the fourth for 28 days. Differences were not significant (p < 0.05) between the five treatments, for the eclosion rate, in all cases this was 100%. For the juveniles, four experimental treatments were conducted, each in duplicate. For all treatments, the conch were stocked at 10 individuals/4 liters (2.5 inf/l). Two treatments were irradiated for 10 minutes daily for 30 days: the others two treatments were control groups without irradiation. The initial average length of conchs was 13.5 1 mm and 14.77 mm for the irradiated and control groups, respectively. The final average length of conchs was 13.77 mm and 14.28 mm, respectively, for the irradiated and control groups, respectively. The initial average weigth for conchs was 309 mg and 359 mg for the irradiated and control groups, respectively, while the final average weight was 328 mg and 367 mg for the irradiated and control groups, respectively.

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