scholarly journals Gillnet selectivity in Hake Merluccius merluccius and Red mullet Mullus surmuletus in the Mediterranean Sea

2002 ◽  
Vol 68 (sup1) ◽  
pp. 371-375
Author(s):  
JACQUES SACCHI
Keyword(s):  
Mediterranean Sea ◽  
Merluccius Merluccius ◽  
Red Mullet ◽  
Mullus Surmuletus ◽  
The Mediterranean

scholarly journals Morphological characterization of Dujardinascaris spp. (Nematoda: Anisakidae) from the striped red mullet Mullus surmuletus in the Mediterranean Sea

2019 ◽  
Vol 56 (4) ◽  
pp. 338-346 ◽  
Author(s):  
R. Gamal Taha Hassan
Keyword(s):  
Mediterranean Sea ◽  
Dorsal Surface ◽  
Demersal Fish ◽  
The Body ◽  
Economic Losses ◽  
Helminth Parasites ◽  
New Host ◽  
Red Mullet ◽  
Mullus Surmuletus ◽  
The Mediterranean

SummaryThe striped red mullet Mullus surmuletus (Linnaeus, 1758) (Perciformis: Mullidae) has a high commercial value and therewithal is a common demersal fish of the Mediterranean Sea, therefore studying the helminth parasites of this fish is required. Anisakids nematodes are common parasites of animals including human causing economic losses and different parasitic diseases. During the present study, the nematode Dujardinascaris spp. (Anisakidae) was described from the body cavity and small intestine of Mullus surmuletus in the Alexandria, Mediterranean Sea, Egypt as new host and new geographical record. Forty-five (37.5%) fish out of (120) were found infected by the parasite. The morphological features of the collected nematode were investigated by both light and scanning electron microscopy. The study revealed that the specimens were characterized from other species of the genus by the presence of two large lateral pouches attached to each cephalic lip, the different large-sized papillae on the cephalic region and on the dorsal surface of the nematode cuticle.

Patterns of genetic differentiation between two co-occurring demersal species: the red mullet (Mullus barbatus) and the striped red mullet (Mullus surmuletus)

2009 ◽  
Vol 66 (9) ◽  
pp. 1478-1490 ◽  
Author(s):  
J. A. Galarza ◽  
G. F. Turner ◽  
E. Macpherson ◽  
C. Rico
Keyword(s):  
Gene Flow ◽  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
Flow Patterns ◽  
Ecological Features ◽  
Red Mullet ◽  
Mullus Barbatus ◽  
Mullus Surmuletus ◽  
The Mediterranean ◽  
Demersal Species

The accurate identification of genetic partitioning is of primarily importance when devising conservation management strategies for today’s marine resources. The great variety of genetic structure displayed by demersal species underscores the need for the identification of common patterns that can be found across species. Here, we analyse allele frequency variation at 10 microsatellite loci of two congener demersal fish, the red mullet ( Mullus barbatus ) and the striped red mullet ( Mullus surmuletus ), from the Atlantic Ocean and the Mediterranean Sea. The results indicate that two different gene flow patterns exist between these species. The red mullet’s genetic distribution was found to be highly structured, resembling that of a metapopulation composed by independent, self-recruiting subpopulations with some connections between them. The striped red mullet displayed less genetic heterogeneity within the Mediterranean Sea and a substantial gene flow reduction between the Atlantic Ocean and Mediterranean Sea. Our results indicate that gene flow patterns in the demersal environment can be substantially different between closely related species with highly comparable biology, suggesting that biogeographic boundaries can affect demersal species in a different way despite common ecological features and spatial overlap. We conclude that the delimitation of such boundaries could be determined by the fine differences in life history traits between species.

Radiological risks assessment due to natural radioactivity in Mediterranean sea fishes

2021 ◽  
Vol 17 ◽  
Author(s):  
F. Caridi ◽  
G. Belmusto
Keyword(s):  
Mediterranean Sea ◽  
Sparus Aurata ◽  
Dicentrarchus Labrax ◽  
Sardina Pilchardus ◽  
Cancer Risks ◽  
Merluccius Merluccius ◽  
Solea Solea ◽  
Mullus Surmuletus ◽  
Thunnus Alalunga ◽  
Belone Belone

Background and Objectives: In this article a comprehensive study was carried out for the determination of natural radioactivity in Mediterranean sea fishes and the evaluation of radiological health risks due to their ingestion. All analyzed samples came from the Calabria region, southern Italy, and, in particular, from the district of Reggio Calabria. Method: A total of seventy representative samples, five for each investigated species (Sardina Pilchardus, Mugil Cephalus, Scomber Scombrus, Sparus Aurata, Dicentrarchus Labrax, Tonnus Thynnus, Thunnus Alalunga, Xiphaias Gladius, Pagellus Erythrinnus, Engraulis Encrasicholus, Belone Belone, Solea Solea, Merluccius Merluccius, Mullus Surmuletus) were analyzed through HPGe gamma spectrometry. The evaluation of dose levels and lifetime cancer risks for adult members of the population due to the fishes ingestion was also performed. Results: The specific activity of 40K was investigated and its mean value was found to be: (157 ± 17) for Sardina Pilchardus, (138 ± 14) for Mugil Cephalus, (118 ± 13) for Scomber Scombrus, (128 ± 14) for Sparus Aurata, (146 ± 17) for Dicentrarchus Labrax, (93 ± 11) for Tonnus Thynnus, (137 ± 15) for Thunnus Alalunga, (98 ± 10) for Xiphaias Gladius, (105 ± 12) for Pagellus Erythrinnus, (132 ± 14) for Engraulis Encrasicholus, (113 ± 12) for Belone Belone, (34 ± 5) for Solea Solea, (76 ± 9) for Merluccius Merluccius and (96 ± 11) for Mullus Surmuletus, respectively. Conclusions: The committed effective dose and the lifetime cancer risks for adult members of the population due to the consumption of the investigated samples are lower than the average world value, the maximum acceptable level and the allowed range, respectively. It can then be concluded that the Mediterranean sea fishes consumed in the study area pose no significant health risks to the population from a radiological point of view.

Occurrence of Juvenile Red Mullet (Mullus Surmuletus) on the West Coast of Scotland

1997 ◽  
Vol 77 (3) ◽  
pp. 911-912 ◽  
Author(s):  
R.N. Gibson ◽  
L. Robb
Keyword(s):  
Shallow Water ◽  
North Sea ◽  
West Coast ◽  
Fish Fauna ◽  
The West ◽  
Fishing Vessels ◽  
Red Mullet ◽  
Sea Bed ◽  
Mullus Surmuletus ◽  
The Mediterranean

Eight individuals of Mullus surmuletus (Teleostei: Mullidae) ≤80 mm total length were captured in shallow water in the Firth of Lorn, western Scotland in August and September 1995. The species is rare on the west coast of Scotland and the occurrence of juveniles is a new record for the area.The red mullet (Mullus surmuletus L.) is a species whose distribution is centred on the Mediterranean where it forms the basis of a commercial fishery (e.g. Renoñes et al., 1995). Outside the Mediterranean it is found on eastern Atlantic coasts from the Canaries northwards to the English Channel and the southern North Sea where it is ‘moderately common’ (Wheeler, 1969). Further north it is regarded as rare (Wheeler, 1969; Hureau, 1986) and the northern limit is variously given as Scotland (Lythgoe & Lythgoe, 1992) or southern Norway (Wheeler, 1978). Most northern records are from the North Sea (Rae & Wilson, 1954; Rae & Lamont, 1964), presumably reflecting the intensive fishing effort in this area. Records to the west of the British Isles are few and have been summarized by Gordon (1981) and subsequently by Henderson (1986, personal communication), including one from the Faeroes (Blacker, 1977). All recorded occurrences in western Scotland are of adult fish (26–31 cm) caught by commercial fishing vessels and juveniles have never been reported from this area. This note documents (Table 1) the capture of small individuals (N=8) in shallow water off the west coast of Scotland in an area where they had never been recorded previously, despite intensive studies of the local fish fauna since 1970 (R.N.G., personal observation; Gibson, 1973; Gibson et al., 1993). The eight fish were caught on Tralee beach, Ardmucknish Bay, Firth of Lorn, Argyll (56°31′N 5°29′W). The sea bed in this area consists of fine sand (Gibson et al., 1993). It is possible that their occurrence is linked with the unusually warm summer of 1995 allowing juveniles to penetrate further north than usual. Water temperatures at 2–5 m on 29 August, 1995 were 14.3°C compared with a maximum of 13.6°C recorded over the period 1986–1989 (Gibson et al., 1993).

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