However, our ocean is more commonly geographically divided into the Atlantic, Pacific, Indian, Arctic, and Southern (Antarctic). Sinking occurs in a series of specific zones, generally located in the northern parts of the basins, according to two different processes. Not many people use this phrase today, but you could say that the modern Seven Seas include the Arctic, North Atlantic, South Atlantic, North Pacific, South Pacific, Indian, and Southern Oceans. Mariners then referred to the Seven Seas as the Arctic, the Atlantic, the Indian, the Pacific, the Mediterranean, the Caribbean, and the Gulf of Mexico. In Medieval European literature, the phrase referred to the North Sea, Baltic, Atlantic, Mediterranean, Black, Red, and Arabian seas.Īs trade picked up across the Atlantic, the concept of the Seven Seas changed again. In Greek literature (which is where the phrase entered Western literature), the Seven Seas were the Aegean, Adriatic, Mediterranean, Black, Red, and Caspian seas, with the Persian Gulf thrown in as a "sea." In various cultures at different times in history, the Seven Seas has referred to bodies of water along trade routes, regional bodies of water, or exotic and far-away bodies of water. In 2017, the species was listed in both Appendix I and Appendix II of CMS.The origins of the phrase 'Seven Seas' can be traced to ancient times. However, it is clear that it would greatly benefit from better protection in the Mediterranean Sea, and from better regional and international co-operation to preserve the populations that remain in the Mediterranean Sea and in Western Africa. Given the extreme population declines that the species has suffered, current population and migratory status is difficult to determine. It has suffered severe declines and regional extirpation throughout its former range, mainly due to overfishing for locally consumed meat. The species is considered by IUCN as one of the most endangered fish species in the Mediterranean Sea. The global population was assessed by IUCN in 2007 and the Mediterranean Sea population was evaluated again in 2016 in both cases the species was classified as Endangered. In addition, the species is aplacental viviparous, producing live young with embryonic nutrition coming from a yolk sac, with apparent supplementary nutrition during gestation from uterine secretions. Moreover, occurring in shallow waters in the intertidal zone to waters of up to 180 metres in depth, the Common Guitarfish is a bottom-dwelling species that consumes a variety of macrobenthic organisms such as crustaceans, fishes, and molluscs. This predictable migration pattern enables fishers to target adults during this critical phase of the species' life cycle. Many species of Common Guitarfish exhibit a pattern of movement based on their reproductive cycle, as they aggregate seasonally, with females visiting relatively quiet shallow waters for parturition. The dorsal surface of the species ranges from greenish brown to reddish brown with faint bluish-grey longitudinal stripes and markings. ![]() ![]() Rostral ridges are widely spaced over their length and anterior nasal flaps moderately developed. Two upright dorsal fins are separated with the first located well behind the rear tips of the pelvic fin. This species is distinguished by the presence of slightly enlarged pectoral fins with the anterior edge of the pectoral fin attached to the side of the head, wedge shaped disc, pointed triangular snout, and a dorsoventrally flattened body. The Mediterranean Sea population of the Common Guitarfish ( Rhinobatos rhinobatos) is a cartilaginous fish belonging to the elasmobranchs, Family Rhinobatidae and is endemic to the Mediterranean Sea and the eastern Atlantic Ocean.
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