(Short communication) MAIN TEXT Blackfish, Centrolophus niger (Gmelin, 1788), is an epipelagic to mesopelagic fish species belonging to Centrolophidae family. Standard length (SL) 28.5 cm and 28.1 ...cm; total length (TL) 33.7 cm and 33.1 cm, wight 390.8 g and 322.9 g. The specimens had the following diagnostic characters: the first rays on the dorsal fin does not poke and the anus is located behind the tip of backward positioned pectoral fin. Irregular light spots on the body of both individuals can be noticed (Figure 2), which indicates that they are juvenile specimens. Since this is a solitary fish type, the specificity of this finding is reflected in the fact that two individuals of the approximately same size were simultaneously caught at the same locality which confirms that this species may form small schools (Jardas, 1996).
The feeding habits of juvenile fishes belonging to three medusivorous species (Centrolophidae and Nomeidae) from the Strait of Messina (central Mediterranean) during 2009-2010 and 2012 are reported. ...Individuals were collected after stranding along the shore and their diets were investigated by stomach content analysis. Young Schedophilus medusophagus showed a specialist predation on Scyphozoa, based on a strict trophic relationship with Pelagia noctiluca. This jellyfish was also found in the stomach contents of juvenile Centrolophus niger, but in this case was not the dominant prey, as juveniles of this predator fed mainly on chaetognaths and crustaceans (primarily amphipods). Young Cubiceps gracilis primarily fed on chaethognaths, with occasional foraging on copepods and annelids, while no traces of medusae were recorded. The competition among C. gracilis and C. niger for chaetognath food resources was likely mitigated by timing differences in occurrences of these species, probably reflecting seasonal variations in reproductive period and recruitment. The high trophic specialization of S. medusophagus as jellyfish feeders make this predator one of the most efficient key species involved in the control of jellyfish populations.
A single specimen of the rudderfish (Centrolophus niger Gmelin, 1789) was caught using the handline by fishermen on 14 April 2016 in İbrice Bight (Saroz Bay). This paper represents the first record ...of C. niger for Saroz Bay.
Ultrastructural data are provided on the tegument (or neodermis) of proglottids of the cestode Echinophallus wageneri Monticelli, 1890, the first representative of the family Echinophallidae ...(Pseudophyllidea), parasites of bathypelagic fish, studied using transmission and scanning electron microscopy. The surface of the ventral concave side of proglottids is covered with filiform microtriches about 1.7 μm long. Their glycocalyx, although very thick, is less extensively developed compared to that on digitiform microtriches localized on the dorsal side of the proglottids, which is also covered with filiform microtriches. The digitiform microtriches of the convex dorsal side are about 0.6 μm long, with a very short, rounded spine and the extraordinarily extensive glycocalyx seen as flocculent material. Short digitiform microtriches of E. wageneri seem to differ from microthrix types previously reported in other cestodes by transmission electron microscopy. The posterodorsal margin of all proglottids is typical in possessing a transverse band of large spiniform, tusk-shaped microtriches with a very long spine (approximately 13 μm in length), merged with filiform microtriches. Marked regional differences found in the morphology and distribution of microtriches on the proglottids of E. wageneri may be related to the different functions of the individual parts of the strobila because of the curling of the tapeworm body within the intestine of its fish host.
Analysis of the non-saponifiable lipids of the fishes
Lepidocybium flavobrunneum and
Ruvettus pretiosus (escolar), and
Centrolophus niger and
Tubbia spp. (rudderfish) was performed. The analyses were ...used to clarify the cause of recent reports of illness (diarrhoea) in Australia from consumption of purported rudderfish. Both escolar and rudderfish contained very high levels of oil (generally between 14 to 25%, as % wet mass) in the fillet and the oil compositions were different to most seafood. Escolar oil contained mainly wax ester (>90% of oil). The oil from five specimens of rudderfish contained mainly diacylglyceryl ether (DAGE, >80% of oil) or hydrocarbon (>80% of oil, predominately squalene). One rudderfish specimen contained mainly polar lipid. Major differences in oil content and composition, including fatty alcohol and glyceryl ether diols (derived from DAGE), were observed between purported individuals of the same species or related species of rudderfish, raising the possibility of geographic or seasonal differences affecting the oil composition. The oil composition of fish fillet samples associated with the health issues were consistent with the profiles for escolar, rather than rudderfish species. These findings, in particular the lipid class and fatty alcohol profiles, were supported by general protein fingerprinting results and were consistent with the samples originating from individuals of the escolar species
L. flavobrunneum. The high wax ester content of the escolar group clarifies the reported diarrhoeal effects to consumers. Purgative properties of high wax ester containing fish oils have been reported for escolar and other species. The results highlight the potential for non-saponifiable lipid profiles to be used for identification of fish fillets and oils to at least group level.
Muscle of rudderfish (Centrolophus niger), or black ruff, a rare mesopelagic fish caught in the South Atlantic, was found to contain 19.3% total lipids. The major part of the lipids (~70%) was ...unusual in not yielding glycerol but non-saponifiable glyceryl ether diols on alkaline hydrolysis. These ether diols included selachyl (C18:1), chimyl (C16:0) and batyl (C18:0) alcohols in amounts of 54.0, 21.6 and 8.8%, respectively. The remainder of the lipids was normal, comprising 24.2% triacylglycerols and small amounts of phospholipids, free fatty acids, cholesterol and squalene. The phospholipids were similar in composition to those of other fish species, consisting of 56% phosphatidylcholine, 20% phosphatidylethanolamine, 8% sphingomyelin, 7% phosphatidylinositol, 7% cardiolipins, 1% phosphatidylserine and 1% lyso phosphatidylcholine. The fatty acids of total lipids had oleic acid (C18:1, 37.7%) as the main component, whereas the phospholipids contained large amounts of dosahexaenoic acid (C22:6, 33.6%). Conflicting reports about the consequences for health of consuming rudderfish fillets are in circulation, but our work showed no adverse effects on consuming them. PUBLICATION ABSTRACT
Milanella familiaris n. gen. and n. sp. (Bothriocephalidea: Triaenophoridae) is proposed to accommodate a new cestode from blackfish Centrolophus niger (Gmelin) (Perciformes: Centrolophidae). ...Milanella is characterized as follows: trapeziform, i.e., markedly craspedote proglottids with a velum-like posterior margin and horn like lateral projections; pyriform uterine sac in the first gravid proglottids; arrow-shaped scolex with well-developed apical disc and prominent posterior margins; strobila with intensively stained corpuscles, most numerous in the anterior part; deeply lobated ovary; absence of a neck; a large, pyriform, thin-walled cirrus-sac with the proximal part bent anteromedially; vagina posterior to the cirrus-sac; and cortical vitelline follicles. Milanella most closely resembles Bathycestus Kuchta and Scholz, 2004, PistanaCampbell and Gartner, 1982, and Probothriocephalus Campbell, 1979, differing mainly in the shape of proglottids and uterine sac.
Bothriocephalidean tapeworms parasitic in the blackfish, Centrolophus niger, are redescribed on the basis of the evaluation of freshly collected specimens and museum material. This evaluation enabled ...us to supplement species diagnoses by new morphological characters of potential use for phylogenetic analyses, including the data from scanning electron microscopical observations, and to provide a key to identification of the following four species occurring in this fish: Amphicotyle heteropleura, Milanella familiaris (both Triaenophoridae), Bothriocotyle solinosomum and Echinophallus wageneri (both Echinophallidae). Large spiniform microtriches were observed on the surface of the posterodorsal margin of segments of B. solinosomum, E. wageneri and M. familiaris. The invalidity of Atelemerus, first proposed by Bray et al. (1994), is supported by the present data and its type species, A. acanthodes, is newly synonymised with E. wageneri.
Abstract A single specimen of the blackfish, Centrolophus niger (Gmelin, 1789), was recorded on25 March 2011 from the coast of Samandag in Iskenderun Bay (northeastern Mediterranean, Turkey). The ...present paper reports the first occurrence of the blackfish, C. niger, from the Mediterranean coast of Turkey.
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