scholarly journals Bioaccumulation of Metals/Metalloids and Histological and Immunohistochemical Changes in the Tissue of the European Hake, Merluccius merluccius (Linnaeus, 1758) (Pisces: Gadiformes: Merlucciidae), for Environmental Pollution Assessment

2020 ◽  
Vol 8 (9) ◽  
pp. 712
Author(s):  
Antonio Salvaggio ◽  
Roberta Pecoraro ◽  
Chiara Copat ◽  
Margherita Ferrante ◽  
Alfina Grasso ◽  
...  
Keyword(s):  
Fish Species ◽  
Inductively Coupled Plasma ◽  
Pollution Assessment ◽  
Hepatic Tissue ◽  
Trophic Chain ◽  
Merluccius Merluccius ◽  
Commercial Fish ◽  
Coastal Species ◽  
High Level ◽  
European Hake

Pollution and other types of environmental stress do not spare marine environments, especially those affected by high industrial pressure. Fish, especially coastal species, are used for monitoring the marine environment because they are particularly efficient as bioindicators thanks to their ability to bioaccumulate and biomagnify along the trophic chain. The aim of this research is to evaluate the bioaccumulation and the indirect bioindication ability of the European Hake, Merluccius merluccius (Linnaeus, 1758), one of the most important commercial fish species of the Mediterranean Sea. Morphological and histological alterations of the main target organs, such as liver and gills, have been investigated and the results showed a steatosis in the hepatic tissue. The accumulation of heavy metals has been analyzed by inductively coupled plasma mass spectrometry and for several metals it was showed a different concentration in the two sexes. Moreover, the expression of metallothioneins 1 and Heat Shock Protein 70 has been assessed by immunohistochemistry and did not show high level of expression. We underline the importance of contamination evaluation in commercial fish species and the utilization of the ichthyofauna as bioindicator of environmental quality.

scholarly journals Preliminary study on otolith chemistry and otolith morphology of two demersal fish species, European hake Merluccius merluccius (Linnaeus, 1758) and striped red mullet (Mullus surmuletus, Linnaeus, 1758) in the Sea of Marmara

2021 ◽  
Vol 38 (4) ◽  
pp. 515-521
Author(s):  
Habib Bal ◽  
Selim Esen
Keyword(s):  
Chemical Analysis ◽  
Fish Species ◽  
Demersal Fish ◽  
Migration Routes ◽  
Merluccius Merluccius ◽  
Tracking Stocks ◽  
Red Mullet ◽  
Mullus Surmuletus ◽  
The Difference ◽  
European Hake

Otoliths are calcium carbonate (CaCO3) accumulations. Under the influence of different ecosystems morphological and chemical composition change. In this study, economically important two demersal fish species; European hake Merluccius merluccius (Linnaeus, 1758) and Stripet red mullet (Mullus surmuletus Linnaeus, 1758) was examined. Otoliths (Sagitta) belonging to these two species have been studied both chemically and morphologicall. Morphometric measurements of otoliths (length, mm; width, mm; area, mm2; perimeter, mm) in the sagittal of each species was made by the Leica M125 tri-ocular microscope. In the chemical analysis of otoliths, strontium (Sr), magnesium (Mg) and calcium (Ca) trace element amounts, the ratios of Sr and Mg trace elements to Ca element (Sr/Ca and Mg/Ca) were determined. For the micro-chemical analysis of otoliths ICP-MS was used. The highest magnesium (24.92±9.57 mmol/mol) and strontium (26.17±1.81 mmol/mol) element values were found in the otolith of red mullet. The difference between strontium (Sr) and magnesium (Mg) amounts for two fish species was found to be significant (P<0.05). In addition to it was found that the difference between them in the amount of calcium is significant (P<0.001). The shape indexes of otoliths are significantly different between the two fish species. Especially in terms of roundness (RD) and aspect ratio (AR) (P<0.001). The results of this study provide information about the habitats of two economic importance demersal fish species. Since such studies can give information about the habitat areas of fish species, they are important for tracking stocks, migration routes and sustainable fisheries.

scholarly journals Chromosome-level genome assembly of the greenfin horse-faced filefish (Thamnaconus septentrionalis) using Oxford Nanopore PromethION sequencing and Hi-C technology

2019 ◽  
Author(s):  
Li Bian ◽  
Fenghui Li ◽  
Jianlong Ge ◽  
Pengfei Wang ◽  
Qing Chang ◽  
...  
Keyword(s):  
Fish Species ◽  
Population Decline ◽  
Gene Families ◽  
Single Copy ◽  
Protein Coding ◽  
Commercial Fish ◽  
Marine Aquaculture ◽  
West Pacific Ocean ◽  
High Level ◽  
Chromosome Level

AbstractThe greenfin horse-faced filefish, Thamnaconus septentrionalis, is a valuable commercial fish species that is widely distributed in the Indo-West Pacific Ocean. It has characteristic blue-green fins, rough skin and spine-like first dorsal fin. T. septentrionalis is of a conservation concern as a result of sharply population decline, and it is an important marine aquaculture fish species in China. The genomic resources of this filefish are lacking and no reference genome has been released. In this study, the first chromosome-level genome of T. septentrionalis was constructed using Nanopore sequencing and Hi-C technology. A total of 50.95 Gb polished Nanopore sequence were generated and were assembled to 474.31 Mb genome, accounting for 96.45% of the estimated genome size of this filefish. The assembled genome contained only 242 contigs, and the achieved contig N50 was 22.46 Mb, reaching a surprising high level among all the sequenced fish species. Hi-C scaffolding of the genome resulted in 20 pseudo-chromosomes containing 99.44% of the total assembled sequences. The genome contained 67.35 Mb repeat sequences, accounting for 14.2% of the assembly. A total of 22,067 protein-coding genes were predicted, of which 94.82% were successfully annotated with putative functions. Furthermore, a phylogenetic tree was constructed using 1,872 single-copy gene families and 67 unique gene families were identified in the filefish genome. This high quality assembled genome will be a valuable genomic resource for understanding the biological characteristics and for facilitating breeding of T. septentrionalis.

scholarly journals Determination of HeaDetermination of Some Heavy Metals in Three Fish Species from Duhok City Markets in Kurdistan of Iraq

2019 ◽  
Vol 7 (4) ◽  
pp. 152-157
Author(s):  
Shahyan S. Ahmed ◽  
Mahmood A. Hasan
Keyword(s):  
Heavy Metals ◽  
Fish Species ◽  
Inductively Coupled Plasma ◽  
Winter Season ◽  
Dry Weight ◽  
International Standards ◽  
Emission Spectrometry ◽  
Commercial Fish ◽  
Mean Values ◽  
Permissible Limits

In this study, the concentrations of some heavy metals including Al, Cu, Fe, Mn, Zn, Cd, Co, Cr, Ni and Pb were determined in the muscles of three commercial fish species available in Duhok city markets in two seasons, using inductively coupled plasma-optical emission spectrometry (ICP-OES), after the wet digestion process. Lowest and highest mean values of metals in µg/g (dry weight) were as follows: Al: Under Detection Limit (UDL)-3.71, Cu: UDL-4.00, Fe: 5.40-21.44, Mn: UDL-3.45, Zn: 13.38-140.11, while Cd, Co, Cr, Ni, and Pb were not detected. The highest levels of Al, Fe and Zn were recorded in Shukhat fish species, and the highest levels of Cu and Mn were recorded in Shabout in the winter season. The highest level of all metals was recorded for Zn (172.8 µg/g) with the highest mean value of (140.11 µg/g) in Shukhat species during winter.  Most heavy metal concentrations were below the international permissible limits for fish, however, some of the maximum and mean values of metals were above the international standards. Fe concentrations were above the maximum allowable limits set by WHO (1999). Zn concentrations were above the maximum permissible limits set by joint FAO/WHO (1989) and FAO (2012).

scholarly journals Histological discrimination of fresh and frozen/thawed fish meat: European hake (Merluccius merluccius) as a possible model for white meat fish species

Food Control ◽  
2018 ◽  
Vol 92 ◽  
pp. 154-161 ◽  
Author(s):  
Lara Tinacci ◽  
Andrea Armani ◽  
Alessandra Guidi ◽  
Daniele Nucera ◽  
Deborah Shvartzman ◽  
...  
Keyword(s):  
Fish Species ◽  
White Meat ◽  
Merluccius Merluccius ◽  
Fish Meat ◽  
European Hake

Body shape and trawl cod end selectivity for nine commercial fish species

2003 ◽  
Vol 83 (6) ◽  
pp. 1309-1313 ◽  
Author(s):  
Zafer Tosunoğlu ◽  
Yeliz Doğanyilmaz Özbilgin ◽  
Hüseyin Özbilgin
Keyword(s):  
Fish Species ◽  
Body Shape ◽  
Morphological Characteristics ◽  
Mesh Size ◽  
Sea Bream ◽  
Merluccius Merluccius ◽  
Commercial Fish ◽  
Red Mullet ◽  
Common Pandora ◽  
Merlangius Merlangus

This study investigates the catch components of a commercially used demersal trawl cod end in Izmir Bay, and reveals some of the morphological characteristics of nine commercial fish species; red mullet (Mullus barbatus), hake (Merluccius merluccius), whiting (Merlangius merlangus euxinus), poor cod (Trisopterus minutus capelanus), tub gurnard (Trigla lucerna), common pandora (Pagellus erythrinus), axillary sea bream (Pagellus acarne), picarel (Spicara smaris) and annular sea bream (Diplodus annularis) in relation to mesh size and shapes. Furthermore selectivity of 40-mm polyethylene netting cod end for red mullet, hake, common pandora, axillary sea bream, picarel and annular sea bream is presented. The results are discussed in a way to understand the probable effects of fish body shape on mesh selectivity.

scholarly journals Otolith chemistry: an aid to stock separation of Helicolenus dactylopterus (bluemouth) and Merluccius merluccius (European hake) in the Northeast Atlantic and Mediterranean

2006 ◽  
Vol 63 (3) ◽  
pp. 504-513 ◽  
Author(s):  
S.C. Swan ◽  
A.J. Geffen ◽  
B. Morales-Nin ◽  
J.D.M. Gordon ◽  
T. Shimmield ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Life Histories ◽  
Ocean Basin ◽  
Merluccius Merluccius ◽  
Inductively Coupled ◽  
Stock Discrimination ◽  
Continental Slopes ◽  
Plasma Mass Spectrometry ◽  
Helicolenus Dactylopterus ◽  
European Hake

Abstract Helicolenus dactylopterus and Merluccius merluccius are widely distributed on the continental slopes of the Atlantic and Mediterranean and have quite different life histories. Both are commercially exploited, but little is known about their stock structure. Fish otolith composition is thought to reflect both endogenous processes and external factors, some of which relate to the surrounding environment, and therefore may be used as a tool for stock discrimination. The elemental composition of sagittal otoliths was examined using both solution-based inductively coupled plasma mass spectrometry of the whole otolith and laser-ablation analysis of the otolith nucleus. The relative concentrations of strontium, barium, and copper in dissolved whole otoliths contributed to the discrimination between H. dactylopterus samples from different geographic areas. Surface analysis of the otolith nucleus did not allow separation of geographic groups. For M. merluccius, separate analyses of the whole otolith data for the Atlantic and Mediterranean samples gave a clear distinction of the different groups within each ocean basin. Analysis of the M. merluccius nucleus composition indicated some differences in elemental concentration among both Atlantic and Mediterranean samples. Magnesium and lead were important elements in separating the groups in the Atlantic, and barium, strontium, and lead were important in the Mediterranean.

THE NUMBER AND QUALITATIVE CHARACTERISTICS OF FRY FISH IN SHALLOW COASTAL WATERS OF THE VOLGA IN THE SUMMER-AUTUMN PERIOD OF 2012

2017 ◽  
pp. 65-73
Author(s):  
Edward Vladimirovich Nikitin
Keyword(s):  
Fish Species ◽  
Coastal Waters ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Volga River ◽  
Commercial Fish ◽  
Autumn Period ◽  
Fish Juveniles ◽  
Qualitative Characteristics ◽  
Shallow Coastal Waters

Shallow coastal waters of the Volga river is a flooded feeding area for fish juveniles of nonmigratory fish species. There takes place annual downstream migration of fluvial anadromous fish species from spawning grounds of the Volga river to the Northern Caspian Sea. The most important factors determining the number and qualitative characteristics of fry fishes are the level of the Caspian Sea (currently having a tendency to the lowering), hydrological and thermal regimes of the Volga river. Researches were carried out in definite periods of time. In the summer-autumn period of 2012 fry fishes were presented by 19 species (13 of them were commercial species), which belonged to 9 families. The article gives data on all the commercial fish species. In the first decade of July the maximum number of fry fish was registered in the western part of the Volga outfall offshore - in box 247 (19.86 mln specimens/km2), in the eastern part - in box 142 (20.4 mln specimens/km2). The most populous were roach, red-eye, silver bream and bream; size-weight characteristics were better in the areas remoted from the Volga delta. In the third decade of July the quantitative indicators of fry fish on these areas decreased, size-weight characteristics greatly increased. In the second decade of October in the western part of the seaside there were registered increased pre-wintering concentrations of fish juveniles, their qualitative indicators increased, which is evidence to favorable feeding conditions in 2012.

Sign in / Sign up

Export Citation Format

Share Document