Browsing by Author "Boualleg, C."

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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.
Effect of parasitic copepods on the growth of Abramis brama fish from Beni-Haroun dam of Mila city (Northeast Algeria)
(2021-10-11) Barook, H; Sahtout, F; Kaouachi, N; Boualleg, C.
The growth parameters are valuable data to provide a good understanding on the general biology and the population dynamics of fishes, as well as enable to establish the mathematical models to compare the growth curves, and subsequently to perform the demographic analyses. Thus, the present work was undertaken to study the effect of two parasitic copepods, namely Ergasilus sieboldi and Ergasilus briani on the growth of 141 fish individuals of Abramis brama species from Beni-Haroun dam of Mila city (northeast Algeria). Herein, the study was conducted on 141 fish individuals during the period July 2015-October 2016. The age of fishes was determined by scalimetric method since the fish sex was macroscopically determined where the number of females was found very higher (97) than that of males (44). Moreover, the fish growth study was performed according to the mathematical method of Von Bertalanffy (1938). The determined growth parameters in Abramis brama fish affected by the two parasitic copepods showed that the non-parasitized host fishes present the following growth values: L∞=40 cm; K=0,30; t0=-0,29; Ø’=2,68, while the growth values of the parasitized host fishes are L∞=30 05 cm; K=0,31; t0=-0,27; Ø’=2,48. Hence, these parasites slow down the absolute growth in length of the parasitized fishes, which in turn suffer the decline in their K condition index (K=0,10) compared to non-parasitized fishes (K=0,22). Further, the evolution of the studied total fish weight in relation to their size exhibits a negative (minor) allometry (b<3) for the non-parasitized and parasitized specimens (without distinction between both sexes).