Various studies have shown the importance of using different types of Zooplankton biomasses as an additional substance in the diet of fish. In addition, the drainage water of the fish cultures could be used in plant irrigation. In this study, biomasses of water flea Daphnia magna and Gammarus pulex collected and tested, for the first time, their effect against pathogenic microorganisms and on plant germination. The results showed significant antibacterial activity of D. magna and G. pulex against Staphylococcus aureus and Pseudomonas aeruginosa bacteria, as well as antifungal activity against Alternaria solani and Penicillium expansum, which gives the possibility to be used as biocontrol against these bacteria and plant pathogenic fungi. Furthermore, both animals showed positive activity in the germination rate of Vicia faba seed, reaching 83.0 ± 3.5 and 86.0 ± 3.8%, respectively. In conclusion, the biomasses of D. magna and G. pulex are promising and effective agents for their use in the medical field against some pathogenic microbes and as stimulators of plant growth.

Pectoral fin total Width (Pect. F): The distance from the fin origin to the end of the free rear tip. Pectoral fin upper posterior margin (Pect. H1): The distance between the tip of the fin and the deepest point of the concave curve of the posterior margin. Pectoral fin lower Posterior margin (Pect. H2): The distance between the deepest point of the concave curve of the posterior margin to the posterior end of the dorsal fin. Pectoral fin posterior margin (Pect. I): The distance between the fin tip and the posterior tip of the free rear tip. Pectoral fin angle (Pect. Jº): The angle between the direct fin height (K) and the mid-fin base (1⁄2 B). Pectoral fin height (direct) (Pect. K): Distance from the mid-fin base (F) to the tip of the fin. Pectoral fin height (absolute) (Pect. L): Perpendicular distance from the fin baseline (F) to the tip of the fin.

The present study aimed to provide an update on carcharhinid sharks (Family: Carcharhinidae) in the Egyptian Mediterranean waters, based on the differences in morphological features of the body. A total of 36 specimens of carcharhinid sharks belong to 7 species of family Carcharhinidae were seasonally collected from the commercial catch at land fish market in Alexandria of Mediterranean Sea, during the period from May 2017 to June 2018. Morphometric characters were recorded for each specimen. Many photos had been captured for each shark specimen and processed by Image J software for calculating different ratios of morphological aspects for shark's body. Results showed that seven species belonging to the family Carcharhinidae (Carcharhinus altimus, C. brachyurus, C. brevipinna, C. falciformis, C. obscurus, C. plumbeus and Prionace glauca) were found to inhibit the Egyptian Mediterranean waters at Alexandria. Four of them were firstly recorded in the Egyptian Mediterranean waters (i.e. C. brachyurus, C. falciformis, C. obscurus and Prionace glauca. Our study was attempted to add some morphometric characters for the identification of studied species. Statistical analysis of morphometric ratios showed significant differences between investigated species (P<0.05), revealing its capability as classifying tool.

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