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Distribution and ecological aspects of leptocephali collected 1979–1994 in North- and Central Atlantic. I. Congridae
Helgoländer Meeresuntersuchungen volume 52, pages 85–102 (1998)
Abstract
This is the first report on the leptocephalus catches made during the last 15 years in North-and Central Atlantic during the course of 19 cruises of five different ships from Germany and one from Poland. This report comprises identification, geographical occurrence and abundance and in some cases depth preference, migratory routes and spawning area of Congridae in the North Atlantic. The largest part of this collection consists of 876Conger conger larvae. The likelihood that this species spawns in the Mediterranean is again confirmed. Decreasing density as well as increasing size from Gibraltar west-and north westward showed migration to be occurring in that direction. Age was determined by counting “daily rings” on the otoliths of up to 120-mm long larvae. It is suggested to be more than 300 days and is calculated to be 1 1/4 years for the largest larvae (TL=140–160 mm). Some 126 specimens of three otherConger species, i.e.C. oceanicus, C. triporiceps, C. esculentus, were identified in the collection. The major part originated from the western North Atlantic. The most numerous larvae, belonging to another genus of Congridae, wereAriosoma balearicum (n=265). They showed, also in consideration of other studies, quite a wide range in number of myomeres. Their systematic status is therefore uncertain, as is also the status of those known from the NW Indian Ocean and the NW Pacific. One larva, probably ofAriosoma selenops, of un-usually large size (TL=467 mm) and captured in the Iberian Basin is described and compared with specimens known from the literature. Two larvae of unknown identity were captured off NW Africa; they resembledA. balearicum but had too high a number of myomeres. The identity of most of theGnathophis larvae caught in the East Atlantic is uncertain. Leptocephali ofParaconger notialis in the East Atlantic, up to the area north of New Guinea, exhibited a higher number of myomeres than those known from the West Atlantic. Larvae ofXenomystax congroides (n-29), belonging to a population with a relatively high number of myomeres, were captured in the Sargasso Sea.
Literature cited
Antunes, C., 1994. Estudo da migraçao e metamorfose deAnguilla anguilla L. por análise dos incrementos dos sagittae, em leptocéfalos e enguias de vidro. Diss., Univ. Porto, 294 pp.
Antunes, C. & Tesch, F.-W., 1997. A critical consideration of the metamorphosis zone when identifying daily rings in the otoliths of European eel,Anguilla anguilla (L.).—Ecol. Freshwat. Fish6 102–107.
Bertin, L., 1954. Les larves leptocephaliennes géantes et le problème du “serpent de mer”.—Nature, Paris82, 312–313.
Blache, J., 1968. Contribution à la connaissance des poissons anguilliformes de la côte occidentale d'Afrique, Septième note: La famille des Muraenesocidae.—Bull. Inst. fr. Afr. noire (Sér. A)30, 690–736.
Blache, J., 1977. Leptocephales des poissons anguilliformes dans la zone sud du Golfe, de Guinée.—Faune trop.20, 1–381.
Blache, J. & Bauchot, M.-L., 1972. Contribution à la connaissance des poissons anguilliformes de la côte occidentale d' Afrique, Troisième note: Les genres Verma, Apterichthus, Ichthyapus, Hemerorhinus, Caecula, Dalophis avec la description de deux genres nouveaux (Fam. des Ophichthidae).—Bull. Inst. fr. Afr. noire (Sér. A)34, 692–773.
Blache, J. & Bauchot, M.-L., 1976. Contribution à la connaissance des poissons anguilliformes de la côte occidentale d'Afrique, Note 16: Les familles des Congridae et Colocongridae.—Bull. Inst. fr. Afr. noire (Sér. A)38, 369–444.
Böhlke, J. E. & Chaplin, C. C. G., 1968. Fishes of the Bahamas and the adjacent tropical waters. Livingston Press, Wynnewood, 771 pp.
Castle, P. H. J., 1959. A large leptocephalid (Teleostei, Apodes) from off South Westland, New Zealand.—Trans. R. Soc. N. Z.87, 179–184.
Castle, P. H. J., 1964. Congrid leptocephali in Australian waters with descriptions ofConger wilsoni (Bl. and Sch.) andC. verreauxi Kaup.—Zool. Publ. Vict. Univ. Wellington37, 1–45.
Castle, P. H. J., 1966. Die ichthyologische Ausbeute der ersten Westafrika-Fahrt des fischereitechnischen Forschungsschiffes “Walther Herwig”. 3. The eel larvae (leptocephali).—Arch. Fisch Wiss.17, 19–35.
Castle, P. H. J., 1967. Two remarkable eel-larvae from off Southern Africa.—Spec. Publ. Dep. Ichthyol. Rhodes Univ.,1, 1–121.
Castle, P. H. J., 1970. Ergebnisse der Forschungsreisen des FFS “Walther Herwig” nach Südamerika. 9. The leptocephali.—Arch. FischWiss.21, 1–21.
D'Ancona, U., 1931. Uova, larve e stadi giovanili di Teleostei, Ordine: Apodes.—Fauna Flora Golfo Napoli38, 94–156.
Fortuno, J. M. & Olivar, M. P., 1986. Larvas de Anguilliformes Capturadas en el Atlantico Sudoriental.— Miscnea zool.10, 223–231.
Grassi, B., 1913. Contributo alla conoscenza delle uova e delle larve dei Murenoidi.—Memorie R. Com. talassogr. ital.45, 1–32.
Keller, A., 1976. Systematics, vertical distribution and the life history of anguilliform leptocephali in the Bermuda Ocean Acre. Diss., Univ. of Rhode Island, 256 pp.
Lea, E., 1913. Muraenoid larvae from the “Michael Sars” North Atlantic Deep-Sea Expedition, 1910. —Rep. scient. Results “Michael Sars” N. Atlant. deep-Sea Exped.3, 1–59.
Maul, G. E., 1972. A new species of eel of the genusGnathophis (Apodes, Congridae) from the Meteor Seamount.—Bocagiana8 (VI), 1–7.
McCleave, J. D. & Miller, M. J., 1994. Spawning ofConger oceanicus andConger triporiceps (Congridae) in the Sargasso Sea and subsequent distribution of leptocephali.—Envir. Biol. Fish.39, 339–355.
Mochioka, N., Kakuda, S. & Tabeta, O., 1982. Congrid leptocephali in the western North and Middle Pacific, I Exterilium Ariosoma Type Larvae.—J. Fac. biol. Sci. Hiroshima Univ.21, 35–66.
Mochioka, N., Tabeta, O., Kakuda, S. & Tsukahara, H., 1991. Congrid leptocephali in the western North and Middle Pacific. II. Non-Exterilium Ariosoma Type Larvae.—Bull. mar. Sci.48, 606–622.
Schmidt, J., 1912. Contributions to the biology of some North Atlantic species of eels.—Vidensk. Meddr naturh. Foren64 39–51.
Schmidt, J., 1913. First report on eel investigations 1913.—Rapp. P.-v. Reun. Cons. int. Explor. Mer18 (2), 1–29.
Schmidt, J., 1931. Eels and conger eels of the North Atlanic.—Nature, Lond.128, 602–604.
Smith, D. G., 1971. Osteology and relationships of the congrid eels of the western North Atlantic (Pisces, Anguilliformes). Diss., Univ. of Miami, 163 pp.
Smith, D. G., 1981. Congridae, Muraenesocidae. In: F. A. O. species identification sheets for fishery purposes (Fishing areas 34, 47/Eastern Central Atlantic). Ed. by W. Fischer, G. Bianchi & W. B. Scott. Department of Fisheries and Oceans, Ottawa,2.
Smith, D. G., 1989. Family Congridae, Leptocephali. In: Fishes in the Western North Atlantic. Ed. by E. B. Böhlke Sears Foundation for Marine Research, New Haven,9, 2, 1–1055.
Strehlow, B., 1992. Untersuchungen an Leptocephali und adulten Exemplaren der Ordnung Anguilliformes aus dem Iberischen Becken und dem Seegebiet vor Nordwestafrika. Diss., Univ. Rostock, 208 pp.
Tesch, F.-W., 1980. Occurrence of eelAnguilla anguilla larvae west of the European continental shelf, 1971–1977.—Envir. Biol. Fish.5, 185–190.
Tesch, F.-W., 1982. The Sargasso Sea eel expedition 1979.—Helgoländer Meeresunters.35, 263–277.
Tesch, F.-W., 1983. Der Aal. Parey, Hamburg, 340 pp.
Tesch, F.-W. & Niermann, U., 1992. Stock density of eel larvae (Anguilla anguilla L.) on the European continental slope, based on collections made between 1985 and 1989.—Ir. Fish. Invest. (Ser. A)36, 110–113.
Tesch, F.-W. & Wegner, G., 1990. The distribution of small larvae ofAnguilla sp., related to hydrographic conditions 1981 between Bermuda and Puerto Rico.—Int. Revue ges. Hydrobiol.75, 845–858.
Tesch, F.-W., Niermann, U. & Plaga, A., 1986. Differences in development stage and stock density of larvalAnguilla anguilla off the west coast of Europe.—Vie Milieu36, 255–260.
Utrecht, W. L. van, 1988. A new eel larva,Leptocephalus pseudomicrocephalus, belonging to the subfamily Bathymyrinae (Anguilliformes, Congridae).—Bull. zool. Mus. Univ. Amsterdam11, 149–152.
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Strehlow, B., Antunes, C., Niermann, U. et al. Distribution and ecological aspects of leptocephali collected 1979–1994 in North- and Central Atlantic. I. Congridae. Helgoländer Meeresunters. 52, 85–102 (1998). https://doi.org/10.1007/BF02908739
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DOI: https://doi.org/10.1007/BF02908739