Browsing by Author "Touarfia, M"

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    A Study of Parasitic Copepod Infesting Two Freshwater Fish Populations (Cyprinus carpio and Abramis brama) from Beni-Haroun Dam (Mila) North-East of Algeria
    (2020-02-12) Berrouk,H; Tolba,M; Touarfia, M; Boualleg,Ch.
    Copepods are one of the main fish ectoparasites, commonly known among the parasitism world, due either to their special adaptive capacity or to induce stress in aquatic organisms, as well as the parasitism result is overall a physiological rate affecting the survival of host. This study was, therefore, aimed to investigate the ectoparasite copepods, infesting 277 fishes including 135 of Cyprinus carpio (Linnaeus, 1758) and 142 of Abramis brama (Linnaeus,1758), collected from BeniHaroun dam (Mila, northeast Algeria). The fishes were subjected to some morphometric measurements and gill dissections and the harvested parasites were afterwards stored and identified. The parasitic indices were determined to examine the effect of size, sex, season and
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    Copepod Parasites of the Gills of Luciobarbus Callensis (Valencienne, 1842) and Carassius Carassius (Linnaeus, 1758) (Cyprinid Fish) Collected from Beni Haroun Dam (Mila, Algeria).
    (2018-10-12) Berrouk, H; Tolba, M; Boucenna, I; Touarfia, M; Bensouilah, M; Kaouachi, N; Boualleg, C.
    In aquaculture, the crustaceans are classified among the most dreadful parasites due to their high potential contamination hazards. Some parasitic copepods are responsible for a massive mortality of stocks, however, there has been a lack of knowledge on the Algerian freshwater fish. Therefore, the present work aimed to study the infestation of copepod ectoparasites of 499 fish, including 257 individuals of Luciobarbus callensis (Valencienne ,1842) and 242 of Carassius carassius (Linnaeus, 1758) species found in Beni Haroun Dam (Mila, Algeria). The fish were subjected to some morphometric measurements, and thereby, a gill dissection was measured, harvested, preserved and identified, as well the parasitic indices were calculated. The effect of some parameters (size, sex season, and microhabitat) on the parasite infestation was tested by using 𝜒𝜒2 test. The gill examination of the individuals of the two host populations led to an inventory of eight parasitic species in Luciobarbus callensis and six species in Carassius carassius. Also, the study of epidemiologic indices of host species revealed that the higher recorded values were found in Luciobarbus callensis (P= 12,84%; I=2.33; A=0.29) (Tab.1). Nevertheless, the seasonal evaluation of the parasite indices of copepods obtained from the same species revealed that the most important values were noted in summer (P=23,63%; A=0,61; I=2,61). Moreover, Carassius carassius provided high infestation rates and parasite infestation charges, respectively during spring (I=1.77; A=0.21) and summer (P=12.76%). The χ2 values showed the effect of season (𝜒𝜒2 obs = 18.833 > 𝜒𝜒2 0.05 = 6.251 ddl=3) and the size (𝜒𝜒2 obs =14,639 > 𝜒𝜒20,05 =4.605; ddl=2) on the parasite infestation of the two host species, since there was no effect due to the microhabitat and sex.
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    Ecology, phenology and wintering behavior of Anatidae in the wetlands of Souk–Ahras (north–eastern Algeria)
    (2021-06-09) Bouali, N; Baaloudj, A; Touarfia, M; Houhamdi, L; Maazi,M.C; Houhamdi, M
    Ecology, phenology and wintering behavior of Anatidae in the wetlands of Souk–Ahras (north– eastern Algeria). Understanding the spatial and temporal niche of waterfowl is essential for effective management and conservation. To determine the ecology and phenology of Anatidae in North Africa, we carried out a 12–month study (2019–2020) in three wetlands that constitute a winter refuge for waterbirds in the Souk–Ahras region in north–east Algeria. We surveyed species richness, the seasonal pattern of the number of Anatidae, and their wintering diurnal behavior using regular counts and scans. We recorded thirteen species: six wintering species (Anas clypeata, Anas penelope, Anas strepera, Tadorna tadorna, Aythya ferina, Anas crecca crecca) and three sedentary nesting species (Anas platyrhynchos, Oxyura leucocephala, and Aythya nyroca), the latter two having national and international protection status. The survey showed that the wintering behavior of all these species is dominated by sleep, which on average accounts for almost half of the total time (48.91 %). Our results indicate that the three wetlands host a complex waterfowl community that includes species of conservation concern and that these sites likely play an essential role in providing the essential resources for wintering