Influence of 70 Watt Electric Lights on the Capture of Fish By Otter Trawl Off Plymouth

1986 ◽  
Vol 66 (3) ◽  
pp. 711-720 ◽  
Author(s):  
M. R. Clarke ◽  
P. L. Pascoe ◽  
L. Maddock
Keyword(s):  
Catch Rate ◽  
Otter Trawl ◽  
Trachurus Trachurus ◽  
Merluccius Merluccius ◽  
Bottom Trawling ◽  
Merlangius Merlangus ◽  
Comparative Trials

The effect of two 70 W underwater electric lamps on the catch rate of a commercial bottom otter trawl was determined by comparative trials both at night and in daylight. It was found that, although the overall numbers and weights of fish caught did not differ, most of the species which were caught in large enough numbers for a judgement to be made showed a reaction to light. Three species, Trachurus trachurus, Merlangius merlangus and Trisopterus minutus were attracted and four species, Eutriglagurnardus, Micromesistius poutassou, Merluccius merluccius and Limanda limanda were scared off by light.The possible use of lights to further the development of selective commercial bottom trawling by attracting or scaring particular species is discussed.

scholarly journals Can a square-mesh panel inserted in front of the cod end improve size and species selectivity in Mediterranean trawl fisheries?

2018 ◽  
Vol 75 (5) ◽  
pp. 704-713 ◽  
Author(s):  
Jure Brčić ◽  
Bent Herrmann ◽  
Antonello Sala
Keyword(s):  
Deep Water ◽  
Bottom Trawl ◽  
Horse Mackerel ◽  
Trachurus Trachurus ◽  
Merluccius Merluccius ◽  
Low Probability ◽  
Low Efficiency ◽  
Trawl Fisheries ◽  
European Hake ◽  
Atlantic Horse Mackerel

An experiment was conducted to assess the selectivity in a typical Mediterranean bottom trawl, equipped with a square-mesh panel inserted in front of the cod end, for Atlantic horse mackerel (Trachurus trachurus), European hake (Merluccius merluccius), red mullet (Mullus barbatus), poor cod (Trisopterus minutus), broadtail shortfin squid (Illex coindetii), and deep-water rose shrimp (Parapaeneus longirostris). The release efficiency of undersized individuals through the panel was low. The differences in selectivity between the gear with and without the panel were very small. The low release efficiency of the square-mesh panel was caused by the lack of fish contact with the panel as they drifted towards the cod end, since the average contact probability was estimated not to exceed 9% for any of the species investigated. A low probability of contact with the selection device was thus found to be the reason for the low efficiency of the square-mesh panel.

scholarly journals Occurrence of acanthocephalans in Teleost fishes of Gemlik Bay, Sea of Marmara, Turkey

2006 ◽  
Vol 43 (2) ◽  
pp. 103-108 ◽  
Author(s):  
M. Oğuz ◽  
Y. Kvach
Keyword(s):  
Mediterranean Basin ◽  
New Record ◽  
Common Species ◽  
Teleost Fishes ◽  
Sea Of Marmara ◽  
Trachurus Trachurus ◽  
Merluccius Merluccius ◽  
Scorpaena Scrofa ◽  
The Mediterranean Basin ◽  
Uranoscopus Scaber

Abstract The fish acanthocephalan fauna of Turkish waters is poorly known. In this study 8 fish species (Merluccius merluccius, Trachurus trachurus, Uranoscopus scaber, Gobius niger, G. cobitis, Scorpaena scrofa, Eutrigla gurnardus, Solea vulgaris) were collected from Gemlik Bay and examined for their acanthocephalan fauna. Four species not previously recorded in fish of Turkish waters were found: Solearhynchus soleae (Echinorhynchidae), Acanthhocephaloides propinquus, Paracanthocephaloides kostylewi (Arhythmacanthidae), and Longicollum pagrosomi (Pomphorhynchidae). The most common species was A. propinquus, a parasite that infects mostly gobiids (G. niger, G. cobitis). Longicollum pagrosomi was a new record for the Mediterranean basin.

Preparaciôn y caracterización química y microestructural de surimi de merluza (Merluccius merluccius) y de jurel (Trachurus trachurus) / Preparation and chemical and microstructural characterization of surimi from hake (Merluccius merluccius) and horse mackerel (Trachurus trachurus)

1997 ◽  
Vol 3 (1) ◽  
pp. 49-60 ◽  
Author(s):  
E. Álvarez-Parrilla ◽  
A. Puig ◽  
M.A. Lluch
Keyword(s):  
Microstructural Characterization ◽  
Fish Muscle ◽  
Horse Mackerel ◽  
Muscle Fibres ◽  
Trachurus Trachurus ◽  
Merluccius Merluccius ◽  
Typical Structure ◽  
Low Protein ◽  
Protein Density

Surimi and kamaboko prepared from hake ( Merluccius merluccius) and horse mackerel ( Trachurus trachurus) were characterized chemically and microstructurally. During the process, protein and lipid values decreased while ash, chloride and free nitrogen extract values increased. Hake surimi and kamaboko had less humidity and a higher value of protein than horse mackerel surimi and kamaboko. In both gels water activity decreased and whiteness increased. Horse mackerel kamaboko was more elastic while hake kamaboko was harder and more brittle. The microstructural study showed that the typical structure of fish muscle was lost, giving rise to a porous protein matrix with regions of high and low protein density, as well as some fragments of muscle fibres.

Biodiversity and biogeography in heterospecific teleostean (Gadidae) – copepod (Lernaeocera) associations

1993 ◽  
Vol 71 (8) ◽  
pp. 1639-1645 ◽  
Author(s):  
Claire Tirard ◽  
Patrick Berrebi ◽  
André Raibaut ◽  
François Renaud
Keyword(s):  
Geographical Area ◽  
Western Mediterranean ◽  
Merluccius Merluccius ◽  
Predator Prey ◽  
The North ◽  
Large Sector ◽  
The North Sea ◽  
Merlangius Merlangus ◽  
The Mediterranean ◽  
Host Parasite

This genetic study confirms the validity of two controversial parasite species, Lernaeocera branchialis and Lernaeocera lusci (Copepoda, Pennellidae). These species cohabit throughout a large sector of the North Sea and the Atlantic Ocean, parasitizing Merlangius merlangus and Trisopterus luscus (Teleostei, Gadidae), respectively. In the Mediterranean Sea, it was L. branchialis that was described initially. We have shown, however, that it is L. lusci that parasitizes T. luscus and Merluccius merluccius in this geographical area. The distribution of L. lusci, as well as that of its host, T. luscus, must extend into the Mediterranean. Lernaeocera lusci has colonized a phylogenetically distant host (Merluccius merluccius) in the Mediterranean and our results show that this species has become the preferred host for the maturation of L. lusci in this region. In addition, we have demonstrated the existence of genetic differentiation between T. luscus from the Atlantic and from the western Mediterranean. Thus, it is possible that the specialization of L. lusci in a new resource (M. merluccius) in the Mediterranean might be related to biological changes undergone by this copepod's original host, Trisopterus luscus. In contrast to other parasite groups such as the Monogenea, the specialization of species of the genus Lernaeocera would appear to depend more on ecological parameters (relative abundance and availability of resources) than on phylogenetic constraints. The relationships within these host–parasite systems are therefore compared with the predator–prey relationships.

Distribution of Anisakis larvae, identified by genetic markers, and their use for stock characterization of demersal and pelagic fish from European waters: an update

2007 ◽  
Vol 81 (2) ◽  
pp. 117-127 ◽  
Author(s):  
S. Mattiucci ◽  
P. Abaunza ◽  
S. Damiano ◽  
A. Garcia ◽  
M.N. Santos ◽  
...  
Keyword(s):  
Fish Species ◽  
Population Genetic ◽  
Genetic Data ◽  
Pelagic Fish ◽  
Canonical Discriminant Analysis ◽  
Fish Populations ◽  
Trachurus Trachurus ◽  
Merluccius Merluccius ◽  
Fish Hosts

AbstractIn the present paper, recent results obtained on the use of different distributions observed in larval species of Anisakis, genetically identified by means of allozyme markers, for stock characterization of demersal (Merluccius merluccius), small (Trachurus trachurus) and large pelagic (Xiphias gladius) finfish species in European waters, are reviewed and discussed. Several species of Anisakis were identified in the three fish hosts: A. simplex (s.s.), A. physeteris, A. typica, A. ziphidarum,A. pegreffii, A. brevispiculata and A. paggiae. Canonical discriminant analysis performed on all the samples of the three fish species collected in areas comprising their geographical range, according to the different species of Anisakis identified, showed distinct fish populations in European waters. In all the three fish hosts, the pattern of distribution of Anisakis larvae allowed discrimination of Mediterranean stocks from Atlantic stocks. In the case of swordfish, the possible existence of a southern Atlantic stock separated from a northern one is also suggested. Congruence and discordance with the population genetic data inferred from allozyme markers on the same samples of the three fish species are also discussed.

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