Longfin crevalle jack and London Corinthian Sailing Club

The longfin crevalle jack, Caranx fischeri, is a recently described species of large marine fish classified in the jack family, Carangidae. It inhabits the subtropical waters of the east Atlantic Ocean, ranging along the African coast from Mauritania south at least to Moçamedes in southern Angola, with the species historically present in the Mediterranean Sea. It is an inshore species, known to occasionally penetrate estuaries, possibly to spawn. The species is very similar to the crevalle jack, Caranx hippos, and is separated by its extended dorsal and anal fin lobes as well as more detailed anatomical features including dorsal and anal fin ray counts. The fish is known to reach 127 cm in length and 20.9 kg in weight. The longfin crevalle jack is a predatory fish, taking small fish as its main prey. Due to longstanding confusion between C. fischeri and C. hippos, the importance of each species to African fisheries is poorly understood, with a known combined catch in this region of between 2,233 and 10,054 tonnes per year in 1995-2004. Like its close relatives, the species is considered a powerful gamefish and highly sought after, although their coarse flesh makes for relatively poor quality food.

Contents 1 Taxonomy and naming 2 Description 3 Distribution and habitat 4 Biology and fishery 5 References 6 External links

§Taxonomy and naming

The longfin crevalle jack is classified within the genus Caranx, one of a number of groups known as the jacks or trevallies. Caranx itself is part of the larger jack and horse mackerel family Carangidae, a group of percoid fishes in the order Perciformes.

The species belongs to the "Caranx hippos complex" as defined by William Smith-Vaniz and Kent Carpenter, which includes C. fischeri, C. hippos and C. caninus. The identity of the species was entangled with C. hippos until William Smith-Vaniz and Ken Carpenter described the species in full in 2007, anatomically setting it aside from C. hippos. The holotype specimen is derived from a specimen collected in 1978 off Cameroon, and was initially referred to C. hippos. The species has no synonyms due to its recent description, but the species has been misidentified as both C. hippos and C. carangus (now synonymous with C. hippos). The specific epithet is in reference to Dr. Walter Fischer, a former official of the FAO who initiated the Species Identification and Data Program. The naming of the new species was presented at an IGCC and FAO meeting. The species common name as defined by Smith-Vaniz and Carpenter is 'longfin crevalle jack', referring to the extended fin lobes which separates the species from the crevalle jack. §Description

The longfin crevalle jack is large species, growing to a maximum recorded size of 53 cm as measured by Smith-Vaniz and Carpenter in their description. Discussion on the angling merits of the species in the same publication indicate that the species grows significantly larger, recorded up to 127 cm by anglers mistaking it for C. hippos. It has a body profile similar to most of the large species in Caranx, possessing a strongly compressed approximately oblong form. The dorsal profile is much more convex than the ventral profile, with the caudal peduncle quite slender. The dorsal fin is in two parts, the first consisting of 8 spines and the second of 1 spine followed by 21 to 24 soft rays. The dorsal and anal fin lobes are slightly elongated on the species, which distinguishes from the similar crevalle jack. The anal fin consists of 2 detached spines anterior to the main bulk of the fin, which consists of 1 spine followed by 17 to 19 soft rays. The lateral line is moderately arched anteriorly, with this section containing 50 to 73 scales, while the straight section has 0 to 16 scales and 24 to 41 scutes. The breast is devoid of scales up to the origin of the pelvic fins and is separated from the base of the pectoral fins by a narrow band of scales. there are 20 to 25 gill rakers in total and 24 vertebrae.

The longfin crevalle jack is olive to greenish blue in colour dorsally, fading to pale and white ventrally. The dorsal fin dark brown to grey while the anal fin is brownish yellow, becoming white towards the lobe. The caudal fin is brown-yellow and the pelvic fins white. The species has a dark spot both on its opercle and lower pectoral fin rays. §Distribution and habitat

The longfin crevalle jack inhabits the subtropical waters of the east Atlantic Ocean, currently known to range from Mauritania south to at least Moçamedes in southern Angola. Publications describing historical fish specimens collected in the Mediterranean confirm Caranx fischeri was present in this region, although no recent specimens are known. The species appears to be able to travel long distances, with one adult collected from Ascension Island in the mid-Atlantic.

The longfin crevalle jack appears to be primarily an inshore species based the limited data available, although captures such as those in the Ascension Island indicate the species may live pelagically. In the inshore environment they are known from reefs, as well as estuarine environments, possibly penetrating the upper reaches of rivers. §Biology and fishery

The specifics of the longfin crevalle jack's biology are not known due its recent description and previous confusion with C. hippos. It is clear that all species of crevalle jack are powerful predators, taking a variety of small, schooling fish species including herrings, other carangids and porgies of the family Sparidae. Small jacks, probably including C. fischeri also are known to take invertebrates including shrimps and crabs. Reproduction is poorly known, with spawning possibly occurring in estuaries and rivers.

Due to confusion with C. hippos, the species contribution to fisheries is also poorly understood. A combined total of 2233 to 10054 t per year for C. hippos and C. fischeri was recorded from several African countries by the FAO in the 1995 to 2004 interval, indicating it is of moderate importance. Like the other crevalle jacks, the species is a strong gamefish and sought after by anglers in West Africa. Taken by lures or bait, the species is not considered a good table fish, having coarse, tasteless flesh. §

London Corinthian Sailing Club and Longfin crevalle jack

LCSC Burgee

The London Corinthian Sailing Club is based on the river Thames at Hammersmith. Its activities include Dinghy sailing and racing on the river, and yachting in the Solent and further afield, as well as an active social side including 'Club Nights' every Tuesday evening.

An RYA-approved offshore training establishment with a full training programme is provided, including RYA theory and practical courses for Competent Crew, day skipper, coastal skipper and yachtmaster.

Dinghy racing takes place most weekends throughout the year and some evenings during the summer. Mostly dinghies raced are Enterprises and Lasers. In addition to sailing at Hammersmith, there are regular events against other dinghy clubs on the Thames and clubs further afield.

The yachting programme includes cruises (around the UK, cross-channel, in the Mediterranean and the Caribbean), training weekends, treasure hunts and races organised by the club. The club also participates in winter and spring series racing in the Solent, Cowes Week, Round the Island Race, Cork week, offshore JOG races, RORC races, the Fastnet race and some member-organised events.

The clubhouse is a Georgian building with river views and full facilities.

Contents 1 History 2 See also 3 References 4 External links

§History Linden House

The club was established as the Corinthian Sailing Club in 1894, by a group of sailing enthusiasts who launched their boats from Bell Steps, beside the Black Lion pub, and close to the Hammersmith and Chiswick border. In the early years the members were all men and used to meet at each other's homes to discuss sailing matters and racing. It was then discovered that a new member owned a pub closer to the City and meetings were promptly convened there instead.

This stretch of the Thames tideway was also originally home to the London Sailing Club, which rented a clubhouse directly on the river between The Dove and The Rutland pubs. When the London Sailing Club moved down river towards Essex, the Corinthians were offered the lease of this building and changed their name to the London Corinthian Sailing Club. Boats were moored on the tidal water and at a later date on land when space became available.

For the first forty years or so members built and owned various designs and sizes of boats and a complicated method of handicapping races was devised. During the Second World War the club was asked to provide boat and sailing training for the Royal Air Force. Celestial navigation classes were also started about this time by Dr. Olaf Bradbury and today the club is a West London centre for shore based navigation classes.

After the Second World War the club grew in popularity and became very influential in dinghy design and racing. The club has long associations with Uffa Fox and Jack Holt, designers and builders of famous dinghy classes (Fireflies, Enterprises, GP 14's, etc.). Other classes sailed on this stretch of the river included the Swordfish, International 14, OK, Merlin, Cadet, Mirror and in recent years the Laser and RS200.

The clubhouse suffered severe bomb damage from a V-1 flying bomb during the latter part of the war. Repairs were undertaken, but the structure's days were numbered. Due to significant bomb damage surrounding the clubhouse the Hammersmith Town Council decided that the area should be razed and public gardens created (Furnival Gardens).

The old clubhouse was finally demolished and in the early 1960s the London Corinthians were relocated 200 metres up river to Linden House, a gracious refurbished Georgian building. This new accommodation provided room for future growth and a superb environment for sailing tuition and social functions. Simultaneously, secure covered accommodation for over 100 boats was constructed beneath a development of adjacent flats. Launching ramps, spacious pontoons and a race officers' starting box were installed next to the river.

Throughout the years the London Corinthians have welcomed a broad and diverse membership. It was one of the first London clubs to allow women boat owners and sailors to participate in this hitherto 'male only' sport. Rupert D'Oyly Carte the opera impresario, and his brother Lucas, and musician Leon Goosens were former members. Athlete Roger Bannister, scientist and broadcaster Dr. Magnus Pyke and naturalist Sir Peter Scott all sailed at the club. The reformist MP and author of the popular novel 'The Water Gypsies', A P Herbert, was a solid supporter of the Club throughout his life and his son John was until recently the club's President.

At Sport England's suggestion the LCSC formed the registered charity The London Corinthian Trust (roughly 1998) to purchase Linden House and to safeguard the building for sports use in perpetuity. The Trust owns and maintains Linden House, which is the clubhouse for the London Corinthian Sailing Club and the Sons of the Thames Rowing Club. Donations to further the trust's work are greatly appreciated. Linden House is a popular venue for meetings and private celebrations. For much more about Linden House and the trust see the Linden House link below.

The club continues to grow and is experiencing resurgence in river dinghy sailing. Much of this is due to increased public awareness, availability of club owned boats for members to hire and the popular 'come and try it' weekends that encourage novices onto the water for the first time.

The club is committed to expanding recreational sailing and racing on the Thames and a number of initiatives are being brought forward to safeguard the long-term future of this sport on the tideway.

The club's offshore group continues to grow and in 2007 several teams entered the prestigious Fastnet race. Various rallies, treasure hunts and races are organised on the South Coast, with charter cruises further afield. The club has expanded its shore based theory classes and now offers a wide range of RYA courses, including Yachtmaster and Day Skipper. The club's social events at Linden House are very popular and both informal and formal events are organised throughout the year. §See also Sailing on the River Thames §
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