Effect of commiphora molmol on adults, egg masses and egg-deposition of biomphalaria arabica under laboratory conditions

Commiphora molmol [Myrrh] has molluscicidal effect on Biomphalaria arabica snails at low concentration [40 ppm] after 48 hours exposure. The number of dead-snails increased with increasing the time of exposure. One day-old egg masses were more susceptible [death 100% with 80 ppm] to the ovicidal effect of C. molmol than the five-day old ones [Death 95% with 80 ppm]. However, the eggs were more resistant to the C. molmol effect than the adult snails, embryogenesis began to stop at 20 ppm and eggs were all killed at 60 and 80 ppm. B. arabica fecundity decreased at 1 ppm. Based on safety to man and animals, C. molmol is recommended as a safe molluscidide

Identification of some monogenetic trematodes from some Arabian Gulf fish in Saudi Arabia

Examination of 90 Epinephelus chlorostigma and 50 Lethrinus nebulosus revealed that 99% of the former harbored monogenea belonging to two species. Megalocotyloides epinepheli Bychowsky and Nagibina [Encotyllabe], 1-6 worms per fish from buccal cavity attached to lower pharyngeal plate between teeth. Pseudorhabdosynochus epinepheli Yamaguti 1938 [Diplectanum], over 100 worms per fish were isolated from the gills. On the other hand, 4% of L. Nebulosus harbored another two species of monogenea. Polylabris angifer Hussey, 1986, 1-2 worms per fish were isolated from the gills. Polylabris sp., only one worm was isolated from the gills. The study showed that this is a new locality and new hosts of the four species of worms