New data on Gaidropsarus granti (Regan, 1903) (Gadiformes: Lotidae) from the Mediterranean Sea, with emphasis on its parasites

One adult male Azores rockling Gaidropsarus granti was captured by trammel nets at a depth of about 250 m near the coast of Arbatax (Sardinia, Italy) in early March 2007. This new report confirms a wide bathymetric range for this species. Macroscopic and microscopic analysis of the gonad showed a spent testis at a postspawning stage, with a weak residual spermatogenetic activity. Several body parts of Natantia (Crustacea: Decapoda) were detected in its stomach contents. Different developmental stages of 91 parasite specimens belonging to Arthropoda (Gnathiidae) and Nematoda (Anisakidae, Cystidicolidae and Philometridae) were found in its mouth and gills, and body cavity, respectively. Myxozoan spores were found in the gallbladder. Male and female nematodes of the genus Ichthyofilaria are reported for the first time from the Mediterranean Sea, and a very rare male of this genus is reported for the second time in the world. Parasitological results indicated that this Atlantic migrant probably entered the Mediterranean as an adult, suggesting for a non-indigenous species the possibilities of entering with natural parasites and/or acquiring native parasites in the introduced range.

[1]  G. Nascetti,et al.  Genetic structure and temporal stability in the horse mackerel (Trachurus trachurus) , 2008 .

[2]  N. Campbell,et al.  Anisakis spp. larvae (Nematoda: Anisakidae) from Atlantic horse mackerel: Their genetic identification and use as biological tags for host stock characterization , 2008 .

[3]  L. Paggi,et al.  Occurrence and molecular identification of Anisakis spp. from the North African coasts of Mediterranean Sea , 2008, Parasitology Research.

[4]  P. Merella,et al.  Westward range expansion of the Lessepsian migrant Fistularia commersonii (Fistulariidae) in the Mediterranean Sea, with notes on its parasites , 2007 .

[5]  R. Benítez,et al.  Anisakis spp. in European hake, Merluccius merluccius (L.) from the Atlantic off north-west Africa and the Mediterranean off southern Spain , 2006, Acta Parasitologica.

[6]  K. Said,et al.  Anisakid parasites of two forkbeards (Phycis blennoides and Phycis phycis) from the eastern Mediterranean coasts in Tunisia , 2006, Parasitology Research.

[7]  G. Nascetti,et al.  Molecular systematics, phylogeny and ecology of anisakid nematodes of the genus Anisakis Dujardin, 1845: an update. , 2006, Parasite.

[8]  M. Valderrama,et al.  Anisakid parasites of two forkbeards (Phycis blennoides and Phycis phycis) from the Mediterranean coasts of Andalucía (Southern Spain). , 2006, Parasitology international.

[9]  E. Coluccia,et al.  Metazoan parasite fauna of conger eel Conger conger L. from Sardinian waters (Italy) Parassitofauna in grongo, Conger conger L., delle acque della Sardegna , 2006 .

[10]  A. Sabatini,et al.  FIRST RECORD OF PSENES PELLUCIDUS (PERCIFORMES, ACTINOPTERYGII) IN THE SARDINIAN WATERS (CENTRAL WESTERN MEDITERRANEAN) , 2006 .

[11]  G. Delrio,et al.  Northernmost occurrence of the offshore rockfish, Pontinus kuhlii (Scorpaeniformes: Scorpaenidae), in the Mediterranean Sea , 2005 .

[12]  L. Paggi,et al.  MOLECULAR CHARACTERIZATION OF LARVAL ANISAKID NEMATODES FROM MARINE FISHES OF MADEIRA BY A PCR-BASED APPROACH, WITH EVIDENCE FOR A NEW SPECIES , 2005, The Journal of parasitology.

[13]  F. Andaloro,et al.  The lesser amberjack Seriola fasciata (Perciformes: Carangidae) in the Mediterranean : A recent colonist? , 2005 .

[14]  G. Nascetti,et al.  Genetic identification of Anisakis larvae in European hake from Atlantic and Mediterranean waters for stock recognition , 2004 .

[15]  H. MacIsaac,et al.  Is invasion success explained by the enemy release hypothesis , 2004 .

[16]  B. Galil.  A Sea Under Siege – Alien Species in the Mediterranean , 2004, Biological Invasions.

[17]  P. Quinteiro,et al.  First description of the male and new data on the female ofCristitectus congeri Petter, 1970 (Nematoda: Cystidicolidae) , 1989, Systematic Parasitology.

[18]  B. Berland.  Basic techniques involved in helminth preservation , 1984, Systematic Parasitology.

[19]  R. E. Strauss,et al.  Taxonomic Methods: Morphology , 2004 .

[20]  L. Paggi,et al.  Occurrence of recombinant genotypes of Anisakis simplex s.s. and Anisakis pegreffii (Nematoda: Anisakidae) in an area of sympatry. , 2003, Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases.

[21]  R. Poulin,et al.  Host introductions and the geography of parasite taxonomic diversity , 2003 .

[22]  J. Leiro,et al.  Abdominal macroparasites of commercially important flatfishes (Teleostei: Scophthalmidae, Pleuronectidae, Soleidae) in northwest Spain (ICES IXa) , 2002 .

[23]  C. Piñeiro,et al.  Occurrence of tropical affinity fish in Galician waters, north-west Spain , 2002, Journal of the Marine Biological Association of the United Kingdom.

[24]  M. Sewell.  Nematode Parasites of Vertebrates: Their Development and Transmission , 2002 .

[25]  F. Briand.  CIESM atlas of exotic species in the Mediterranean , 2002 .

[26]  D. Golani.  CIESM Atlas of exotic species in the Mediterranean: Vol 1: Fishes , 2002 .

[27]  S. Klimpel,et al.  Deep-water metazoan fish parasites of the world , 2001 .

[28]  G. Navone,et al.  Redescription of Ichthyofilaria argentinensis Incorvaia, 1999 (Nematoda: Philometridae) parasite of Merluccius hubbsi (Pisces: Merlucciidae) from Argentina. , 2001, Folia parasitologica.

[29]  D. Peris,et al.  Helminth parasite communities of the conger eel in the estuaries of Arousa and Muros (Galicia, north‐west Spain) , 2000 .

[30]  D. Peris,et al.  Parasite community study of the undulate ray Raja undulata in the Rı́a of Muros (Galicia, northwest Spain) , 2000 .

[31]  K. Mathiopoulos,et al.  Genetic markers in ribosomal DNA for the identification of members of the genus Anisakis (Nematoda: ascaridoidea) defined by polymerase-chain-reaction-based restriction fragment length polymorphism. , 2000, International journal for parasitology.

[32]  S. Ferreira,et al.  Nematode parasites from digestive tract of conger Conger conger L. from the Northwest coast of the Iberian Peninsula. , 2000 .

[33]  A. Grutter,et al.  Intraspecific and interspecific relationships between host size and the abundance of parasitic larval gnathiid isopods on coral reef fishes , 1998 .

[34]  P. Álvarez-Pellitero,et al.  Protozoan parasites of gilthead sea bream, Sparus aurata L., from different culture systems in Spain , 1995 .

[35]  G. Poore,et al.  Phylogeny and biogeography of the Gnathiidae (Crustacea: Isopoda) with descriptions of new genera and species, most from southeastern Australia , 1994 .

[36]  Køie Marianne.  Nematode parasites in teleosts from 0 to 1540 m depth off the faroe islands (The North Atlantic) , 1993 .

[37]  J. Quero.  Check-list of the fishes of the eastern tropical Atlantic : Clofeta , 1990 .

[38]  G. Bouix,et al.  Parasites of marine fishes of Montenegro: myxosporidians. , 1989 .

[39]  P. Whitehead,et al.  Fishes of the North-Eastern Atlantic and the Mediterranean. Vol. 1 , 1986 .

[40]  A. Brito,et al.  An annotated checklist of the shorefishes of the Canary Islands. American Museum novitates ; no. 2824 , 1985 .

[41]  JOHN W. Smith.  Anisakis simplex (Rudolphi, 1809, det. Krabbe, 1878): length distribution and viability of L3 of known minimum age from herring Clupea harengus L , 1984, Journal of Helminthology.

[42]  L. Margolis,et al.  REPORT OF AN AD HOC COMMITTEE OF THE AMERICAN SOCIETY OF PARASITOLOGISTS) , 1982 .

[43]  H. Grier.  Cellular Organization of the Testis and Spermatogenesis in Fishes , 1981 .

[44]  M. Holden,et al.  Manual of fisheries science. Part 2 - Methods of resource investigation and their application , 1974 .

[45]  T. Monod,et al.  Check-list of the fishes of the north-eastern Atlantic and of the Mediterranean (Clofnam) = Catalogue des poissons de l'Atlantique du nord-est et de la Méditerranée , 1973 .

[46]  A. Petter.  Quelques Spirurides de Poissons de la région nantaise , 1970 .

[47]  B. Berland.  Nematodes from some Norwegian marine fishes , 1961 .

[48]  R. R. Kudo.  Studies on Myxosporidia; a synopsis of genera and species of Myxosporidia , 1920 .

[49]  F. Steindachner.  Ichthyologische Beiträge (X) , 1881 .

[50]  F. Steindachner.  Ichthyologische Beiträge (III) , 1876 .