On feeding and helminth fauna of neon flying squid Ommastrephes bartramii (Lesueur, 1821) (Cephalopoda: Ommastrephidae) in the southeastern Pacific

Abstract

IntroductionThe dominant oceanic nektonic squid Ommastrephes bartramii (Lesueur, 1821) is very widely distributed throughout the subtropical and lower-laltitude temperate zones of both hemispheres of the world ocean (Nesis, 1987). Its role in structure and functioning of the oceanic ecosystems is important, and has been the subject of study for the last three decades. However, geographical differences between feeding and parasitological characteristics of this species have not been extensively studied. The feeding ecology and helminth fauna was studied in the North Pacific (Shevtsov 1972, Wormuth 1976, Naito et al. 1977, Bower & Margolis 1991, Sinclair 1991, Seki 1993, Nagasawa et al. 1998, Watanabe et al. 2004, Bower & Ichii 2005, Young 2005, Parry 2006, 2008, the North and South Atlantic (Gaevskaya & Nigmatullin 1976, Nigmatullin & Pinchukov 1976 1 , Gaevskaya et al. 1986, Lipinski & Linkowski 1988, Hernandez-Garsia 1995, Lordan 2001, Ivanovic & Brunetti 2004) and the Indian Ocean and Australian waters (Filippova 1974, Dunning 1998, but squids from the southeastern part of the Pacific Ocean have not been investigated. There are only very scanty and superficial data on food of this squid in the central and eastern parts of the South Pacific with food organisms identified to higher taxon level only (Polezhaev 1986, Alexeev 1994 and several preliminary brief publications (Gaevskaya et al. 1983, Nigmatullin et al. 1985. The goal of this paper is to describe the food and helminth compositions of neon flying squid in the subtropical open waters of the southeastern Pacific. Material and methodsSquids used for this study were collected during 1981-1984 aboard AtlantNIRO research vessels at nightlighting drift stations in the south part of the eastern Pacific (Fig. 1). The squids were caught with hand jigs. The squid were immediately frozen after capture and examined for food and helminths 4-6 months later. Squid were analyzed with identification of dorsal mantle length (ML), absolute length (AL), sex, stage of maturity and stomach fullness (six-point scale by Zuev et al. 1985). FeedingSquids used for the food composition study were collected in the area between 17-32°S and 79-95°W in April 1981, July and November-December 1982 and January 1984 ( Fig. 1). Stomach contents were studied on 60 squids of ML 160-392 mm including 40 squids with full stomachs (fullness degree 3-5). From the total squids, 56 were males of ML 160-392 mm and 4 were females of ML 166-240 mm. Crustacean food items were identified by eyes, mandibles, maxillipeds, thoracic limbs and chitinous integuments; cephalopods were determined by beaks, horny rings of suckers and hooks; heteropods were identified by radular hooks; whereas fishes were identified by otoliths, scales and bony elements (Zuev et al. 1985). The identification of fish remains was based on published description according to the main diagnostic traits of osteological elements of pelagic fishes of the southeastern Pacific (Topal 1988). Estimate of fish body size were made fr...

Catastro De La Fauna Endoparasitaria De La Pota Dosidicus Gigas (Cephalopoda) en El Norte Del Perú

“…y Contracaecum sp. se ha observado en el calamar rojo Ommastrephes bartramii (Lesueur, 1821), cuyos huéspedes definitivos son peces óseos (scombroideos y xifoideos), tiburones, mamíferos y aves marinas (Nigmatullin et al, 2009). Tabla 7.…”

A Perspective Around Cephalopods and Their Parasites, and Suggestions on How to Increase Knowledge in the Field

“…The majority of information regarding digenean parasites of cephalopods is provided by Overstreet and Hochberg (1975) and Hochberg (1990) , with some information added over the following decades (e.g., Shukhgalter and Nigmatullin, 2001 ; Nigmatullin et al, 2009 ), including digenean records in squid paralarvae ( Vidal and Haimovici, 1999 ). Around 20 species have been reported from nearly 30 cephalopod hosts, usually with low prevalence of infection ( Hochberg, 1990 ).…”

HELMINTOS PARÁSITOS DE Dosidicus gigas “POTA” EVISCERADA EN AREQUIPA, PERÚ

“…El aumento en la dieta de crustáceos planctónicos que portarían las larvas procercoides de T. coryphaenae como primeros hospederos intermediarios y principalmente de peces paraténicos que en el mar del Perú serian: C. hippurus, Merluccius gayi peruanus (Ginsburg 1954), Scomber japonicus peruanus Houttuyun 1782 y Trachurus pincturatus murphyi Nichols 1920 (Iannacone & Alvariño, 2009), transportarían las larvas plerocercoides que permitirían una acumulación en el tiempo y un aumento de la prevalencia de este helminto con la talla de D. gigas. (Mattiucci & Nascetti, 2006;Nigmatullin et al, 2009 (Shukhgalter & Nigmatullin, 2001 Los resultados obtenidos en el presente estudio evidencian un alto grado de sincronización parasítico-trófico en D. gigas (Shukhgalter & Nigmatullin, 2001). Ambas especies de Anisakis de importancia zoonótica para el Perú, presentaron una prevalencia muy alta en D. gigas.…”