2,310 research outputs found

    Swordfish growth pattern in the strait of Gibraltar; implications for mixing among Atlantic and Mediterranean stocks

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    A growth study of the swordfish in the Strait of Gibraltar was carried out, based on monthly size frequencies data collected from the Moroccan driftnet fishery during the period 2006-2011. The growth parameters were estimated by the modal progression analysis (MPA), using both the Bhattacharya and NORMSEP methods. The standard von Bertalanffy growth function (VBGF) for length was found to be: Lt =253.6 [1-exp (- 0.17(t + 1.30))]. The growth pattern of swordfish in the Strait of Gibraltar was found to be very similar to that obtained from past studies in various Mediterranean areas. Given the existing growth differences among Atlantic and Mediterranean swordfish, this suggests that the majority of fish caught in this area are most likely belonging to the Mediterranean stock. However, further studies are needed to identify the degree of mixing among stocks

    The effect of solvent extracts on the measurement of total polyphenol, flavonoid and tannin contents and its relation to antioxidant capacities from various parts of Terebinth (Pistacia terebinthus L.)

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    Currently there is much interest to find new natural antioxidants, especially antioxidants of plant-based. In order to discover the group of polyphenols, which could be a potential new and reliable sources of natural antioxidants. The fruits, wigs and leaves of Terebinth (Pistacia terebinthus L.) were investigated for their phytochemical constituents, hydrolysable tannin contents, total polyphenol and flavonoid contents as well as antioxidant capacities. Twelve crude extracts were prepared from various parts of Terebinth using solvents of different polarity (water, ethanol, ethyl acetate, and hexane). The hydrolysable tannin content (HTC) gave in terms of tannic acid equivalent using the ammonium ferric citrate assay and total polyphenol and flavonoid contents (TPC and TFC) gave in terms of gallic equivalent using the Folin-Ciocalteu assay and in terms of catechin equivalent employing the aluminum chloride colorimetric method, respectively. Antioxidant capacities were carried by two different ways the TAC (phosphomolybdenum) and the DPPH. Screening tests revealed the existence of sterols, triterpenes, saponins, oses, holosides, tannins, flavonoids and reducing sugars. This study proved that the aqueous extract of Terebinth leaves is a wondrous natural antioxidant compared to standards (BHA and Quercetin). The results show a highly significant correlation between the HTC in relation to antioxidant capacities
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