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Copyright of Egyptian Journal of Aquatic Biology & Fisheries is the property of Egyptian Society for Fisheries Development & Human Health and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Studying the morphological features of the invasive spiny file clam Lima lima was conducted for the first time in the expansion channel of the Suez Canal. Morphological descriptions were based on their exterior morphology and number of radial ribs (mean = 18). Various measurements were recorded, and biometric relationships were examined, particularly the correlations between the independent parameter shell length (SL) and various dependent parameters. Notably, the relationships with shell height and shell inflation demonstrated negative allometric growth. Moreover, regression that describes the relationship between shell length (SL) and soft body weight had a coefficient of determination R2= 0.709, showing a high significant correlation and a negative growth. Molecular analysis showed that the mantle had the highest quantity and optimum quality of gDNA, while the muscles had low value of DNA concentration. Integration of the morphological characteristics by molecular examination using DNA barcoding was designed to confirm the identification of the anti-lessepsian migrant clam L. lima collected from the expansion channel of the Suez Canal. [ABSTRACT FROM AUTHOR]

The Cuttlefish Sepia pharaonis, is an Indo - Pacific organism, and one of the most economic species in the Suez Canal fisheries. Despite its economic value, there is a shortage of taxonomical information on the species. A total of 50 specimens of cuttlefish were collected from the Suez Canal. The sampling was during the period from winter to autumn 2021. Samples were identified morphologically and genetically by using COI gene. The species showed a genetic variation between the different populations of the same species and a genetic variation from the other species of cephalopods. The molecular identification method showed great reliability in the identification of the cuttlefish. [ABSTRACT FROM AUTHOR]

The Cuttlefish Sepia pharaonis, is an Indo-Pacific organism and is one of the most economic species in the Suez Canal fisheries. Despite its economic value, there is a shortage of taxonomical information on the species. A total of 50 specimens of cuttlefish were collected from the Suez Canal. The sampling was during the period from winter to autumn 2021. Samples were identified morphologically and genetically by using COI gene. The species showed a genetic variation between the different populations of the same species and a genetic variation from the other species of cephalopods. The molecular identification method showed a great reliability in the identification of the cuttlefish. [ABSTRACT FROM AUTHOR]

The edible clams in the Timsah Lake are exposed to different industrial wastes which may be connected to the high accumulation of heavy metals in the studied species. Samples were collected from Timsah Lake in February 2019. The depuration experiments were commenced within 4 hours of the collection of shellfish. The lowest concentrations of Pb, Co, Ni and Zn after depuration were recorded at 15°C for R. decussatus while the lowest Pb, Co, Ni and Zn concentrations were recorded at 15°C, 25°C, 25°C and 20°C, respectively, for P. undulata. Significant differences were recorded in the reduction rate of heavy metals in the studied species with different temperatures except for Cu (P<0.05). The highest reduction rates of Cu, Fe, Pb, Co, Ni and Zn were recorded at 25°C, 25°C, 15°C, 15°C, 15°C and 15°C, respectively, for R. decussatus. The highest depuration and reduction rates for all concentrations of heavy metals were determined at starvation trials in R. decussatus (except for Cu and Zn). The current study aimed to evaluate the effect of temperature, feeding and starvation on the reduction of heavy metals (Cu, Fe, Pb, Co, Ni and Zn) in some commercial bivalves; namely, Ruditapes decussatus, Venerupis pullastra and Paphia undulata. [ABSTRACT FROM AUTHOR]

The diet composition of 609 specimens of Sparus aurata respectively from Bardawil lagoon at three stations, were studied monthly from May 2017 to January 2018. The annual diet composition, monthly variations in the diet composition, the variations of the diet with lengths, and the intensity of feeding were studied. Sparus aurata feeds on a wide variety of prey types; crustacea, mollusks, polychaetes, algae, part of fish, undermined matter, and seagrasses. Crustaceans, mollusks, and polychaetes were the major food items in all months and were found in all length groups for Sparus aurata. Crustaceans and algae increased as the size increased, while mollusks and polychaetes decreased as the fish size increased. The feeding activities of Sparus aurata were quite high in September, December, and January at EL-Nasr, Tulul, and Igzwan stations respectively, and May at EL-Nasr. The finding result revealed that defining the relationships between Sparus aurata with other fishes in Bardawil lagoon, in order to understand the dynamic of this regional ecosystem. [ABSTRACT FROM AUTHOR]

Macrobenthic invertebrates samples were collected seasonally from five stations, selected according to their environmental ecosystem (marine, brackish and fresh) in Ashtoum El-Gamil protected area. This protectorate is located in the north western part of Lake Manzala. Macrobenthic community was found including thirty five species belonging to four groups. Of these species, 3 Polychaetes, 19 gastropods, 7 bivalves and 6 crustacean. Some of them are freshwater species and others are marine. Gastropods were dominated other groups, the highest average standing crop was recorded in station V. Macrobenthic fauna reached its maximum average value in spring in the whole area, while winter was the minimum productive season. Environmental parameter and nature of the sediment were important factors affecting distribution and abundance of macro benthic invertebrates. But It has been found that the percentage of the live organisms which have been monitored do not exceed 7% of total organisms. [ABSTRACT FROM AUTHOR]

Copyright of Egyptian Journal of Aquatic Biology & Fisheries is the property of Egyptian Society for Fisheries Development & Human Health and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Egyptian Journal of Aquatic Biology & Fisheries is the property of Egyptian Society for Fisheries Development & Human Health and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)