Parasites in commercially-exploited cephalopods (Mollusca, Cephalopoda) in Spain: an updated perspective

Pascual, Santiago; Gestal, Camino; Estévez, Juan José Ibáñez; Rodríguez, Helena; Soto, M.; Abollo, Elvira; Amado, Cristina

doi:10.1016/0044-8486(96)01254-9

Cited by 63 publications

(40 citation statements)

References 13 publications

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Section: Discussionmentioning

confidence: 99%

“…In rays, larval forms of A. simplex have been found in Raja radiata (Threlfall 1969, Rokicki et al 2001, R. hyperborea (Rokicki et al 2001) and R. naevus (McVicar 1977). In Galicia, larval forms of A. simplex have been found in diverse fish species (Quinteiro et al 1987, Sanmartín et al 1989, Quinteiro Alonso 1990, Peris Caminero 2000, Abollo et al 2001, Aguilar et al 2005) and cephalopods (Pascual et al 1996a,b, Abollo et al 2001, as well as in gulls (Larus cachinnans;Sanmartín et al 2005).We do not know of any previous studies of the parasite fauna of Raja microocellata, R. brachyura and R. montagui. We have previously carried out a study (Sanmartín et al 2000b) of the helminth fauna of R. undulata from an area very close to the capture area of the present study; however, these R. undulata specimens came from inside the estuary Muros-Noia (brackish water), while the rays examined in the present study were captured on the continental shelf off the mouth of this estuary.…”

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Macroparasites of five species of ray (genus Raja) on the northwest coast of Spain

Álvarez¹,

Aragort²,

Leiro³

et al. 2006

Dis. Aquat. Org.

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A parasitological study of rays captured on the Atlantic continental shelf off the estuary Muros-Noia in NW Spain (42°35' to 42°41' N, 9°2' to 9°10' W; mean capture depth 11.6 ± 4.1 m) was performed. A total of 128 rays were examined: 52 specimens of Raja microocellata, 60 of R. brachyura, 6 of R. montagui, 3 of R. undulata and 7 of an unidentified Raja species, known locally as 'fancheca'. A total of 23 macroparasite species were detected: 5 monogeneans (Acanthocotyle sp., Calicotyle kroyeri, Empruthotrema raiae, Merizocotyle undulata, Rajonchocotyle emarginata), 11 cestodes (Acanthobothrium sp., Crossobothrium sp., Echeneibothrium sp., Echinobothrium brachysoma, Grillotia erinaceus, Grillotia sp., Lecanicephalum sp., Nybelinia lingualis, Onchobothrium uncinatum, Phyllobothrium lactuca, Tritaphros retzii), 6 nematodes (Anisakis simplex, Hysterothylacium sp., Histodytes microocellatus, Piscicapillaria freemani, Proleptus sp., Pseudanisakis baylisi) and a copepod (Holobomolochus sp.). All parasite species were present in several ray species, except for Acanthocotyle sp. and G. erinaceus (detected only in R. brachyura), H. microocellatus (detected only in R. microocellata) and T. retzii (detected only in R. montagui). Three species (C. kroyeri, M. undulata, E. brachysoma) have not been reported previously from Spain. The host with the highest parasite species richness was R. brachyura (18 species), followed by R. microocellata (17) and the unidentified Raja species (14). The parasite with the highest prevalence in R. microocellata was M. undulata, followed by R. emarginata, Acanthobothrium sp. and Echeneibothrium sp. The species with the highest prevalence in R. brachyura was R. emarginata, followed by C. kroyeri and P. baylisi. Some differences in parasite prevalence were detected between sexes and among size classes in both R. brachyura and R. microocellata.KEY WORDS: Raja spp. · Monogenea · Cestoda · Nematoda · Copepoda · Galicia (NW Spain) Resale or republication not permitted without written consent of the publisherDis Aquat Org 70: [93][94][95][96][97][98][99][100] 2006 MATERIALS AND METHODSWe examined 52 specimens of Raja microocellata, 60 of R. brachyura, 6 of R. montagui, 3 of R. undulata and 7 of an unidentified Raja species called 'fancheca' by local fishermen. At least 10 specimens were captured and examined per month between March 1999 and March 2000. All captures were from the Atlantic continental shelf off the mouth of the estuary of MurosNoia, in an area situated at 42°35' to 42°41' N, 9°2' to 9°10' W. Mean capture depth was 11.6 ± 4.1 m. All specimens were captured with a traditional local fishing apparatus called a 'trasmallo ' or 'miño' (Rivas Lago 1996). Fish were transferred to the laboratory in refrigerated containers, and examined after storage at 4°C for 2 nights or less.Before dissection, rays were measured and weighed. The following organs and tissues were examined under a stereomicroscope for helminths and crustacean parasites: skin, nasal fossae, gills, heart, digestive ...

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Macroparasites of five species of ray (genus Raja) on the northwest coast of Spain

Álvarez¹,

Aragort²,

Leiro³

et al. 2006

Dis. Aquat. Org.

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“…The eimeriorin coccidian Aggregata octopiana (Apicomplexa: Aggregatidae) is known to heavily infect the digestive tract of octopus, cuttlefish and squids (Pascual et al, 1996). This coccidiosis impairs the well-being of cephalopods, believed to cause a malabsorption syndrome (Gestal et al, 2002a) which finally reduces growth and condition of infected populations (Gestal, 2000).…”

Section: Introductionmentioning

confidence: 99%

Unusual sites of Aggregata octopiana infection in octopus cultured in floating cages

Pascual

González

2006

Aquaculture

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“…Parasitic infection by the eimeriroin coccidian genus Aggregata (Protozoa: Apicomplexa) has been noted as the most important infectious agent in wild and cultured cephalopod stocks from Spanish-Atlantic waters (Pascual et al 1996, Gestal 2000. Gestal et al (1999b) described the ultrastructure of A. octopiana in Galician waters (NW Spain).…”

Section: Introductionmentioning

confidence: 99%

Malabsorption syndrome observed in the common octopus Octopus vulgaris infected with Aggregata octopiana (Protista: Apicomplexa)

Gestal¹,

Cadena²,

Pascual³

2002

Dis. Aquat. Org.

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Octopus vulgaris infected with Aggregata octopiana were collected from an open-water culture system in the Ría of Aldán (NW Spain). Digestive tract infection values were determined with the use of a Neubauer chamber by counting the number of A. octopiana sporocysts. After determining enzyme activity values by the colorimetric Api-Zym system Biomerieux ® , one representative enzyme of glycosidases, peptid hydrolases and phosphoric hydrolases showing high activity was spectrophotometrically analysed. The enzymes were maltase and leucine-aminopeptidase (LAP) involved in the absorption process, and acid phosphatase, a lysosomic enzyme, respectively. Enzymatic activity of maltase and LAP decreased significantly, with increased sporocyst counts. However, acid phosphatase activity increased with severity of infection, indicating the presence of degradative enzymes from phagocytic cells in the infected area. A detrimental effect on gastrointestinal function may result from a decrease or malfunction of absorption enzymes. The results suggest a malabsorption syndrome resulting from parasitic infection.KEY WORDS: Octopus vulgaris · Aggregata octopiana · Absorption enzymes · Maltase · Leucineaminopeptidase · Acid phosphatase · Lysosomic enzyme Resale or republication not permitted without written consent of the publisherDis Aquat Org 51: [61][62][63][64][65] 2002 Aggregata infection may weaken the octopus, making it more vulnerable to other biotic and abiotic stressors.The caecum is the target organ for both trophically transmitted Aggregata infections and absorption in cephalopods (Boucaud-Camoud & Boucher-Rodoni 1983, Hochberg 1990. Consequently, our paper addresses the impact of this enteric infection on the activities of absorption and lysosome enzymes in octopus caecum. MATERIALS AND METHODSCollection of specimens. A total of 24 common octopuses Octopus vulgaris was collected from an openwater culture system in the Ría de Aldán, Galicia, Spain (NE Atlantic Ocean: 42°15' N, 8°48' W). The culture system allowed for easy and available sampling, made it possible to standardise feeding parameters, and thus provided a sample of animals of similar size, grown in similar environmental conditions. To minimise stress, all transported animals were maintained at the laboratory in polyethylene culture tanks containing 200 l of aerated and continuously flowing (60 l h -1 ) natural seawater at 18 to 20°C for 24 h before the experiments. All animals were sized (DML = dorsal mantle length) and weighed (TBW = total body weight) to calculate the K-Fulton condition index [K = (TBW/DML 3 ) × 100]. Preparation of crude extracts. The biochemical study of the enzymatic activities in the host caecum was conducted with excised tissue. The animals were primarily anaesthetised in a seawater:ethanol 70% ratio of 5:1. The caecum was removed and vigorously washed in 10 mM homogenisation phosphate buffer, pH 7.0, and weighed, after removing the digestive tract. For the sporocyst count, host tissue extracts obtained from a portion of cae...

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Parasites in commercially-exploited cephalopods (Mollusca, Cephalopoda) in Spain: an updated perspective

Cited by 63 publications

References 13 publications

Macroparasites of five species of ray (genus Raja) on the northwest coast of Spain

Macroparasites of five species of ray (genus Raja) on the northwest coast of Spain

Unusual sites of Aggregata octopiana infection in octopus cultured in floating cages

Malabsorption syndrome observed in the common octopus Octopus vulgaris infected with Aggregata octopiana (Protista: Apicomplexa)

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