The probiotic potential of lactobacilli isolated from Nile tilapia (Oreochromis niloticus)’s intestine

The potential probiotic acid lactic bacteria isolated from Nile tilapia (Oreochromis niloticus)fs intestine was tested for fish farming. In our collection, 10 Lactobacillus strains were targeted to confront a series of antibiotics in order to draw their resistance profile, and to test their degree of inhibitory to four pathogenic bacteria, Staphylococcus aureus, Escherichia coli, Streptococcus sp. and Pseudomonas sp. The power of acidification and tolerance was tested. Overall, our results show that strains BLT31 and BLT21 are fully susceptible and resistance to the tested antibiotics. Strains BLT3, BLT20, BLT21 and BLT23 have a good antagonistic effect against pathogenic bacteria that cause the highest damage in aquaculture. For acid lactic production, strains BLT3, BLT26, BLT27, BLT28, and BLT31 are considered fast since Ģ pH . 4U in less than three hours. As for the resistance to pH and bile salts, two strains BLT3 and BLT31 showed significant power which gives them acceptable probiotic potential.Key words: Probiotics, antibiotics, aquaculture, the Nile Tilapia, inhibitory activities, lactobacilli

Infestation of dogs by <em>Rhipicephalus sanguineus</em> in two regions of the Far Northeast of Algeria

From March to August 2009, 120 dogs were examined in two bioclimatic regions of the Far Northeast of Algeria (10 dogs per month per region) to estimate the rate and intensity of infestation by the Rhipicephalus sanguineus tick. All the dogs examined were infested by these mites and 895 adult ticks were collected. R. sanguineus was the only species found in Souk-Ahras region, whereas it represented 77% of the collected ticks in El-Kala region. Two other species were identified in that area: Ixodes ricinus and Haemaphysalis punctata with 13 and 10% rates, respectively. The parasite burden was significantly higher (p < 0.01) in the semiarid region of Souk- Ahras with 9.4 ticks per dog, than in the humid region of El- Kala with 4.2 ticks per dog. The ticks have been continuously present throughout the study period. These results should be taken into account in projects to control tick infestation of dogs, with a focus on Rhipicephalus sanguineus, which is responsible for the transmission of both human and animal vector-borne diseases