Mem Inst Oswaldo Cruz, Rio de Janeiro, 96(8) November 2001
Digenea and Acanthocephala of Elasmobranch Fishes from the Southern Coast of Brazil
Laboratório de Helmintos Parasitos de Vertebrados, Departamento de Helmintologia, Instituto Oswaldo Cruz-Fiocruz, Av. Brasil 4365, 21045-900 Rio de Janeiro, RJ, Brasil
*Faculdade de Veterinária, Universidade Federal Fluminense, Niterói, RJ, Brasil
New records for helminth species recovered from elasmobranch fishes in Brazil are established. Digenean and acanthocephalan parasites of elasmobranch fishes are reported from the southern coast of Brazil:u00a0Otodistomum veliporumu00a0(Creplin, 1837) Stafford, 1904 (Digenea: Azygiidae) in the stomach and spiral valve ofu00a0Dipturus trachydermusand in the spiral valve of Squatinau00a0sp. Cystacanths and juveniles of the acanthocephalansu00a0Corynosoma australeJohnston, 1937 andu00a0Corynosomau00a0sp.,u00a0in the spiral valve ofu00a0Squatinau00a0sp.,u00a0Galeorhinus galeusu00a0andu00a0Hexanchus griseusu00a0and in the stomach ofu00a0Squalus megalops;u00a0a juvenile ofu00a0Gorgorhynchusu00a0sp., in the spiral valve ofu00a0Sphyrna zygaena. Dipturus trachydermusu00a0andu00a0Squatina sp. are new host records foru00a0O. veliporum. Digeneans and acanthocephalans are reported for the first time parasitizing elasmobranch fishes in Brazil.
Helminths recovered from Brazilian elasmobranch fishes have been previously reported by Rego et al. (1974), Rego (1977), Vicente et al. (1985), São Clemente and Gomes (1989a, b, 1992), São Clemente et al. (1991), Vicente and Pinto (1999) and Knoff et al. (2001). The present study reports a digenetic trematode and three acanthocephalans parasitizing elasmobranchs, that are referred as new host records for the helminth species.
MATERIALS AND METHODS
A total of 307 elasmobranch fishes were examined. In November 1984, June 1985, and July 1986, 217 elasmobranch fishes: 6 Notorynchus cepedianus (Péron, 1807) (90-130 cm of total length-tl), 14 Squalus megalops (Macleay, 1881) (45-59 cm tl), 37 Mustelus canis (Mitchill, 1815) (70.5-113 cm tl), 35 M. schmitti Springer, 1939 (56-98 cm tl), 37Galeorhinus galeus (Linnaeus, 1758) (86-146 cm tl), 7 Carcharhinus brachyurus (Günther, 1870) (80-108 cm tl), 16Sphyrna zygaena (Linnaeus, 1758) (81-147 cm tl), 5 S. lewini (Linnaeus, 1758) (75-165 cm tl), 20 Squatina guggenheimMarini, 1936 (64-87 cm tl), 26 specimens of Squatina sp. (81-125 cm tl), 12 Raja castelnaui Miranda-Ribeiro, 1907 (70-103 cm tl), 1 Dasyatis say (Lesueur, 1817) (58 cm tl) and 1 D. centroura (Mitchill, 1815) (103 cm tl) were captured off the coast of State of Rio Grande do Sul (30°40'S-33°40'S and 50°40'W-53°20'W; 12-100 m depth) by professional fisherman of the oceanographic ship Atlântico Sul. In March 1998, 46 elasmobranch fishes: 1 Hexanchus griseus (Bonnaterre, 1788) (132 cm tl), 7 Heptranchias perlo (Bon-naterre,1788) (87-107.4 cm tl), 16 Squalus sp. (41-67 cm tl), 9 Scyliorhinus haeckelii (Miranda-Ribeiro, 1907) (41.5-54.5 cm tl), 5 Carcharhinus signatus (Poey, 1868) (120-150 cm tl) and 8 Dipturus trachydermus (Krefft & Stehmann, 1975) (133.5-176 cm tl) were captured at about 125 miles off the coast of State of Paraná (25°50'S-25°52'S and 45°23'W-45°25'W; 200-500 m depth) by professional fishermen of the Icanhema VI fish boat. In March 1999, more 44 elasmobranch fishes: 4 Isurus oxyrhinchus Rafinesque, 1810 (165-221cm tl), 30 Prionace glauca (Linnaeus, 1758) (206-287 cm tl), 2 Carcharhinus signatus (143-190 cm tl), 2 C. longimanus (Poey, 1861) (170-209 cm tl), 1 C. obscurus (Lesueur, 1818) ( 247 cm tl) and 5 Sphyrna zygaena (190-250 cm tl) were captured about 50 m depth, 190 miles off the coast of State of Santa Catarina (27°08'S-28°38'S and 45°30'W-46°53'W) by professional fishermen of the Kiyomã tuna fish boat. On board, their stomachs and spiral valves were collected, labelled and preserved in ice, before examination. Parasites were collected, fixed, stained and mounted according to the methods described in Amato et al. (1991). The systematic organization of the parasites was based on Yamaguti (1971) and Brooks et al. (1985a, b) (Digenea), and on Yamaguti (1963), Golvan (1959,1969), Petrochenko (1971a, b), and Amin (1985, 1987) (Acanthocephala). The prevalence, intensity and mean intensity of infection are indicated in accordance to Bush et al. (1997). The drawings were made with a camera lucida connected to an Olympus BH-2 microscope. All measurements are in millimeters unless otherwise indicated; ranges of measurements are followed by mean values (when indicated) within parentheses. Voucher specimens are deposited in the Coleção Helmintológica do Instituto Oswaldo Cruz (CHIOC), Fiocruz, Rio de Janeiro, RJ, Brazil. At least one specimen of each host species was deposited as voucher host, simbiotype sensu Brooks (1993), in the Coleção Ictiológica do Instituto de Pesca, Santos, SP, Brazil:P. glauca no. IP1967; I. oxyrhinchus no. IP 1968; S. zygaena no. IP 1969; C. longimanus no. 1970; C. obscurus no. IP 1971, are additional specimens to those listed elsewhere (Knoff et al. 2001).
Data are based on specimens recovered in the present investigation and are depicted in the Tables. Taking into account that the referred species are well known, morphometrics refer to the characters considered most important to its diagnosis.
Remarks - The systematics of the genus Otodistomum Stafford, 1904 has been of concern to different authors. Species of this taxon have been reported since the begining of the 19th century, from various marine species of rays and sharks collected from sub-tropical, temperate, sub-Artic and sub-Antartic regions (Manter 1926, Dollfus 1937, Miller 1941, Van Cleave & Vaughn 1941, Kay 1947, Skrjabin & Guschanskaya 1958, Caballero & Caballero 1969, Yamaguti 1971, Gibson 1976a, b, Threlfall & Carvajal 1986, Zdzitowiecki & Pisano 1996).
The systematics of these digeneans parasitizing elasmobranchs was discussed by Manter (1926), Dollfus (1937), Van Cleave & Vaughn (1941) and Gibson (1976a, b) based on differences related to body dimensions, extent and form of uterine branches, extent of vitellaria, ratio between oral and ventral suckers, length and thickness of the egg. The three later authors considered two distinct species of the genus Otodistomum from elasmobranch hosts: O. veliporum (Creplin, 1937) Stafford, 1904 mainly from sharks and O. cestoides (Van Beneden, 1871) Stafford, 1904 mainly from rays, based on differences in the egg. Dawes (1947), Rees (1953), Skrjabin and Guschanskaya (1958) and Brinkmann Jr (1975) suggested that O. cestoides should be considered a synonym of O. veliporum. According to Brinkman Jr (1988) life-cycles of the parasites should be investigated to support this proposition. Nevertheless, we consider our specimens to be O. veliporum based on the fact that the differences now observed in both species may be related to the size of body, compressing conditions, different hosts, and egg thickness that is 2-6 µm in our specimens, compared to 6-10 µm previously reported for O. veliporum (Dollfus 1937, Rees 1953, Skrjabin & Guschanskaya 1958, Caballero & Caballero 1969, Yamaguti 1971); and 3-5.3 µm for O. cestoides (Manter 1926, Dollfus 1937, Miller 1941, Van Cleave & Vaughn 1941, Skrjabin & Guschanskaya 1958, Yamaguti 1971, Gibson 1976a, Threlfall & Carvajal 1986).
This species was reported as O. cestoides from Raja spp., R. flavirostris (= Dipturus flavirostris)and Psammobatis scobina in SouthAmerica (Falkland Islands and Chilean Coast) by Dollfus (1937), Gibson (1976a) and Threlfall and Carvajal (1986) and from Bathyraja eatonii and B. murrayi in the Indian Ocean by Zdzitowiecki and Pisano (1996).
Dipturus trachydermus and Squatina sp. are two new hosts records for the O. veliporum. This is the first report of a digenetic trematode in elasmobranch fishes in Brazil.
Remarks - The species of Corynosoma reported here are probably accidental parasites of elasmobranch fishes, since they are known to use mammals and birds as definitive hosts (Schmidt 1985). The identification of C. australe was obtained on the basis of morphometrics data related mainly to the number of hooks and number of rows of the proboscis (see Petrochenko 1971b). C. australe was originally described parasitizing Neophoca cinerea and was also reported from other marine mammals from Australia (Golvan 1959, Yamaguti 1963, Petrochenko 1971b, Smales 1986). In South America, C. australe had been reported in teleost fishes from Pacific (Peru) to Atlantic waters (Uruguay) (Vergara & George-Nascimento 1982, Zdzitowiecki 1989, Cremonte & Sardella 1997, Tanzola et al. 1997, Oliva 1999). In Brazil these acanthocephalans occurred in teleost fishes: Cory-nosoma sp. in Pomatomus saltator from the coast of the State of Rio de Janeiro and C. australe in Micropogonias furnieri from the coast of the State of Rio Grande do Sul (Rego et al. 1983, Pereira Jr & Neves 1993). The morphology of the other Corynosoma sp. (juvenile form), considered here is similar to C. reductum (Linstow, 1905) Raillet & Henry, 1907 but the evagination of the proboscis did not permit the proper species determination. This is the first occurrence of specimens of Corynosoma in elasmobranch fishes.
Remarks - The juvenile of Gorgorhynchus sp. presents the typical generic characteristics related to the form of the body and the proboscis, the distribution of trunk spines and length of proboscis sheat. Nevertheless, our specimens could neither be identified as Gorgorhynchus trachinotus Noronha et al.,1986, the only Brazilian species of the genus parasitizing the intestine of a teleost fish Trachinotus goodei Jordan and Evermann, 1896 (Noronha et al. 1986) nor as any other described species (Golvan 1969, Petrochenko 1971a). This is the first record of a species of Gorgorhynchus in an elasmobranch host.
To Dr Dely Noronha from the CHIOC, Fiocruz, Rio de Janeiro, for the drawings of Corynosoma spp. To Dr Carolus Maria Vooren from the Universidade do Rio Grande, Rio Grande do Sul, for the identification of fishes captured between the years 1984-1986, to Drs Alberto Ferreira Amorim and Carlos Arfelli from the Instituto de Pesca, Santos, State of São Paulo, for the identification of fishes captured between the years 1998-1999 and to the fishermen of the research ship Atlântico Sul of the Fundação Universidade Federal do Rio Grande, and also the fishing boats Icanhema VI and Kyiomã from Santos both for the help during capture of hosts.
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