Diet of a deep-sea fish, Hoplostethus mediterraneus, from the south coast of Portugal

2002 ◽  
Vol 82 (2) ◽  
pp. 351-352 ◽  
Author(s):  
C. Pais
Keyword(s):  
Deep Water ◽  
Deep Sea ◽  
Prey Species ◽  
South Coast ◽  
The South ◽  
Coastal Fisheries ◽  
Meganyctiphanes Norvegica ◽  
By Catch ◽  
Sea Fish

The beryciform fish Hoplostethus mediterraneus is a species discarded from the southern Portuguese coastal fisheries. It is taken as by-catch by deep water trawls, at depths of between 234 m and 618 m. This species is a benthopelagic feeder, preying mainly on crustaceans. The dominant prey species encountered were the euphausid Meganyctiphanes norvegica and the amphipod Anilocra physodes. It seems that H. mediterraneus is an opportunistic rather than a selective feeder.

Aspects of the biology of Hoplostethus mediterraneus from the south coast of Portugal

2001 ◽  
Vol 81 (4) ◽  
pp. 711-712 ◽  
Author(s):  
C. Pais
Keyword(s):  
Deep Water ◽  
South Coast ◽  
The South ◽  
Coastal Fisheries ◽  
By Catch ◽  
Immature Fish

The beryciform fish Hoplostethus mediterraneus (Beryciformes: Trachichthyidae) is a species discarded from the southern Portuguese coastal fisheries. It is taken as by-catch by deep water trawls, at depths of between 234 and 618 m, more than 80% being taken at depths of between 234 and 422 m. Immature fish ranged from 4 to 13 cm in length and were present at all seasons. Of the mature individuals, males ranged from 7 to 17 cm and females from 7 to 21 cm. From autumn until spring, fish with gonads at various stages of maturation were present, although there were no specimens with mature gonads.

Microplastic ingestion in deep-sea fish from the South China Sea

2019 ◽  
Vol 677 ◽  
pp. 493-501 ◽  
Author(s):  
Lin Zhu ◽  
Hao Wang ◽  
Bijuan Chen ◽  
Xuemei Sun ◽  
Keming Qu ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Deep Sea ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Sea Fish

scholarly journals Tunny Investigations made in the North Sea on Col. E. T. Peel's Yacht, “St. George,” Summer, 1933. Part I. Biometric Data

1934 ◽  
Vol 19 (2) ◽  
pp. 503-522 ◽  
Author(s):  
F. S. Russell
Keyword(s):  
North Sea ◽  
South Coast ◽  
Body Proportions ◽  
The South ◽  
Biometric Data ◽  
The North ◽  
The North Sea ◽  
Sea Fish ◽  
Made In

1. Details are given of the types of hooks lost in tunny in the North Sea in the summer of 1933.2. Data are given on the measurements made on thirty-two large migrating fish caught in the North Sea in August and September, 1933.3. In certain body proportions the tunny measured differ from those in the G4 Group (200 to 260 cm. in length) given by Heldt for fish from Tunis and by Frade for fish from Algarve on the south coast of Portugal, while in some characters they resemble the Tunis fish and in others the Algarve fish, but all the North Sea fish were between 232 and 271 cm. in length.4. It was found that there was a tendency for fish with short second dorsal fins to have short first dorsal, anal, and caudal fins, and for those with long second dorsals to have these other three fins long.5. Measurements were made to supply data on the condition of the fish.

scholarly journals Two new species of Acanthocotyle Monticelli, 1888 (Monogenea: Acanthocotylidae), parasites of two deep-sea skates (Elasmobranchii: Rajiformes) in the South-East Pacific

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Luis A. Ñacari ◽  
Fabiola A. Sepúlveda ◽  
Ruben Escribano ◽  
Marcelo E. Oliva
Keyword(s):  
New Species ◽  
Deep Sea ◽  
The South ◽  
Metazoan Parasites ◽  
Closely Related Species ◽  
Deep Waters ◽  
East Pacific ◽  
Two New Species ◽  
Morphological Differences ◽  
By Catch

Abstract Background Parasites of deep-sea fishes from the South-East Pacific (SPO) are poorly known. Of c.1030 species of fish found in this area, 100–150 inhabit the deep-sea (deeper than 200 m). Only six articles concerning metazoan parasites of fish from deep-waters of SOP are known, and nine monogenean species have been reported. Currently, ten species are known in Acanthocotyle Monticelli, 1888 (Monogenea) and when stated, all of them are found in shallow waters (10–100 m). Acanthocotyle gurgesiella Ñacari, Sepulveda, Escribano & Oliva, 2018 is the only known species parasitizing deep-sea skates (350–450 m) in the SPO. The aim of this study was the description of two new species of Acanthocotyle from two Rajiformes. Methods In September 2017, we examined specimens of two species of deep-sea skates (Rajiformes), Amblyraja frerichsi (Krefft) and Bathyraja peruana McEachran & Myyake, caught at c.1500 m depth off Tocopilla, northern Chile, as a by-catch of the Patagonian tooth fish Dissostichus eleginoides Smitt fishery. Specimens of Acanthocotyle were collected from the skin of the skates. Morphometric (including multivariate analysis of proportional measurements, standardized by total length), morphological and molecular analyses (LSU rRNA and cox1 genes) were performed in order to identify the collected specimens. Results The three approaches used in this study strongly suggest the presence of two new species in the genus Acanthocotyle: Acanthocotyle imo n. sp. and Acanthocotyle atacamensis n. sp. parasitizing the skin of the thickbody skate Amblyraja frerichsi and the Peruvian skate Bathyraja peruana, respectively. The main morphological differences from the closely related species Acanthocotyle verrilli Goto, 1899 include the number of radial rows of sclerites, the non-discrete vitelline follicles and the number of testes. Conclusions The two species of monogeneans described here are the only recorded parasites from their respective host species in the SPO. Assessing host specificity for members of Acanthocotyle requires clarifying the systematics of Rajiformes.

Effects of deep-sea bottom longlining on the Hatton Bank fish communities and benthic ecosystem, north-east Atlantic

2010 ◽  
Vol 91 (4) ◽  
pp. 939-952 ◽  
Author(s):  
P. Durán Muñoz ◽  
F.J. Murillo ◽  
M. Sayago-Gil ◽  
A. Serrano ◽  
M. Laporta ◽  
...  
Keyword(s):  
Deep Water ◽  
Deep Sea ◽  
Cold Water ◽  
Fish Communities ◽  
East Atlantic ◽  
North East ◽  
Sea Bottom ◽  
Rocky Outcrop ◽  
Area North ◽  
By Catch

The effects of deep-sea bottom longlining on fish communities and the benthic ecosystem, as well as the interactions between fishing and seabirds, were studied based on data collected from a joint collaboration between the Spanish Institute of Oceanography and a longliner, carried out on the Hatton Bank area (north-east Atlantic) in 2008. A total of 38 longline sets were distributed mainly along the rugged bottom of the rocky outcrop at depths ranging from 750 to 1500 m. Deep-water sharks and lotids were predominant in the catches contributing respectively 80.4% and 13.1% in terms of weight. Deep-water sharks were predominant in the discards. By-catch of cold-water corals and small glass sponges occurred along the western flank of the Hatton Bank, while large hexactinellids were found along the eastern flank. Longlines fished the adult fraction of vulnerable deep-water sharks and lotids. High catches per unit effort values for these species were obtained in coral areas. A combination of seabird-scaring streamer lines and other measures of preventing seabird by-catch were used. Only one fulmar was captured and it survived. Data on distribution of marine litter and derelict deep-sea gillnets are also presented.

scholarly journals Spectral Relations of Hydro-Optical Characteristics in Coastal Waters of the South Coast of Crimea

2021 ◽  
Author(s):  
V. I. Mankovsky ◽  
E. V. Mankovskaya ◽  
◽  
Keyword(s):  
Attenuation Coefficient ◽  
Coastal Waters ◽  
Deep Sea ◽  
Secchi Depth ◽  
Measurement Data ◽  
South Coast ◽  
Optical Measurements ◽  
The South ◽  
Beam Attenuation ◽  
Beam Attenuation Coefficient

The article studies interrelations of the beam attenuation coefficient in different spectrum regions and spectral relations of beam attenuation coefficient to the Secchi depth in the coastal waters of the South Coast of Crimea. The data were used of in situ optical measurements obtained in 2008–2014 from a stationary oceanographic platform installed in the coastal waters of the South Coast of Crimea near the village of Katsiveli. According to the measurement data the relation was determined of the beam attenuation coefficient in eight parts of the spectrum in the wavelength range of 416–640 nm to the Secchi depth, which varies from 6 m to 17.5 m. Spectral distributions of the beam attenuation coefficient at different Secchi depths in coastal and deep sea waters were compared. As a result, it is concluded that the relationships between the spectral attenuation coefficient and the Secchi depth in coastal waters are not applicable to deep sea waters. It is shown that the feature of such equations in coastal waters is related to the higher concentration of fine suspended matter in them. Intercorrelation parameters were calculated of beam attenuation coefficients in different spectrum regions in coastal waters. High correlation coefficients make it possible to reconstruct distribution of the attenuation coefficient in a wide spectral range based on measurements at one wavelength in any spectrum region. The optimal spectral region to measure the beam attenuation coefficient is 468–527 nm.

Squalene content and neutral lipis composition of Livers from Deep-sea sharks caught in Tasmanian waters

1990 ◽  
Vol 41 (3) ◽  
pp. 375 ◽  
Author(s):  
PP Deprez ◽  
JK Volkman ◽  
SR Davenport
Keyword(s):  
Fatty Acids ◽  
Deep Water ◽  
Deep Sea ◽  
Orange Roughy ◽  
Flame Ionization ◽  
Squalene Content ◽  
Total Fatty Acids ◽  
By Catch ◽  
A Minor ◽  
Layer Chromatography

Deep-sea sharks (mainly dogfish) are a significant by-catch of trawls for the deep-water fish orange roughy (Hoplostethus atlanticus). To test whether the livers of these sharks might be a source of commerically valuable squalene and other lipids, 16 sharks of 8 species were collected from Tasmanian waters at depths of 700-1200 m during research cruise S02/88 of FRV Soela. The sharks were Centroscyrnnus crepidater (longnose velvet dogfish), Centroscyrnnus owstoni (Owston's dogfish), Centroscyrnnus coelolepis (Portuguese dogfish), Deania calcea (shovelnose dogfish), Etmopterus baxteri (Baxter's dogfish), Etmopterus sp. nov. (unnamed dwarf dogfish), Dalatias licha (kitefin or seal shark) and Centrophorus squarnosus (leafscale gulper shark). Squalene content, triacylglycerols, diacylglyceryl ethers, total fatty acids, pristane and other lipids were analysed by capillary gas chromatography and thin-layer chromatography-flame ionization detection. The livers contained high levels of squalene (15-69% by weight), except for the liver of C. squarnosus (I%), which had an unusually high amount of diacylglyceryl ethers (79%). Triacylglycerol and diacylglyceryl ether contents in the livers ranged from 1 to 26% and from 7 to 79% by weight respectively. The C19 isoprenoid alkane pristane was a minor constituent in all samples (0.01-0.56% by weight of liver). The three major esterified fatty acids in all samples were palmitic (16:0), oleic [18: 1 (n - 9)] and eicosa-11-enoic [20: 1 (n - 9)] fatty acids. Polyunsaturated fatty acids were minor constituents. These data indicate that shark livers could provide a profitable by-catch from deep-water trawls, but it is unlikely that shark could form the basis for a target fishery due to their susceptibility to overfishing.

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