The acquisition of the digestive system concepts is still problematic. In this study, we assessed whether 3rd year secondary school learners have acquired and assimilated these concepts at the end of the module. The results we obtained showed that young learners have problems in acquiring these concepts to varying degrees. The role of aliments, the organs and functions of the digestive system, and the phenomena of digestion were relatively acquired by the students. However, the dangers threatening the digestive system and the means of prevention remained unknown for the great majority of these learners. We have also found that learners confused with the digestive system and the respiratory system in some representations.
Parasites communities of the pompano, Trachinotus ovatus (Linnaeus, 1758) (Pisces; Carangidae) were studied in terms of helminths parasites species composition and with descriptions of prevalence and intensity infection. This pelagic fish is commercial in morocco and is performed on aquaculture. Between November 2012 to January 2013, 146 specimens were purchased from the harbour of Cap Water or Ras El Ma (Mediterranean Coast Of Morocco) and examined for parasite infection. Four species of helminths parasites were collected and are reported in this work: Digenean : Lepocreadium trachinoti (Wang 1989) ; (Acanthocephala : Pomphorhynchus françoise (Golvan and Houin 1963) and Rhadinorhynchus cadenati (Golvan 1964); Nematoda : Camallanus singhi (Zaidi and khan 1975). These species were recorded for the first time on the Pompano in Mediterranean Coast Of Morocco. Rhadinorhynchus cadenati was the dominant species with highest prevalence (55, 9%), mean intensity (5, 02) and abundance (6, 81).