scholarly journals Structural and functional analysis of ocular regions of five marine teleost fishes (Hippocampus hippocampus, Sardina pilchardus, Gobius niger, Mullus barbatus & Solea solea)

2015 ◽  
Vol 2 (3) ◽  
pp. 159-166 ◽  
Author(s):  
Samah T. Darwish ◽  
Mahmoud E. Mohalal ◽  
Menna M. Helal ◽  
Hassan I.H. El-Sayyad
Keyword(s):  
Functional Analysis ◽  
Teleost Fishes ◽  
Marine Teleost ◽  
Sardina Pilchardus ◽  
Mullus Barbatus ◽  
Solea Solea ◽  
Hippocampus Hippocampus

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.

Predicting egg size across temperatures in marine teleost fishes

2020 ◽  
Vol 21 (5) ◽  
pp. 1027-1033
Author(s):  
David M. Anderson ◽  
James F. Gillooly
Keyword(s):  
Egg Size ◽  
Teleost Fishes ◽  
Marine Teleost

scholarly journals Sulfate transporters involved in sulfate secretion in the kidney are localized in the renal proximal tubule II of the elephant fish (Callorhinchus milii)

2016 ◽  
Vol 311 (1) ◽  
pp. R66-R78 ◽  
Author(s):  
Kumi Hasegawa ◽  
Akira Kato ◽  
Taro Watanabe ◽  
Wataru Takagi ◽  
Michael F. Romero ◽  
...  
Keyword(s):  
Xenopus Oocytes ◽  
Narrow Range ◽  
Teleost Fishes ◽  
Marine Teleost ◽  
Cdna Sequences ◽  
Solute Carrier ◽  
Cartilaginous Fishes ◽  
Underlying Mechanisms ◽  
Functional Analyses

Most vertebrates, including cartilaginous fishes, maintain their plasma SO42− concentration ([SO42−]) within a narrow range of 0.2–1 mM. As seawater has a [SO42−] about 40 times higher than that of the plasma, SO42− excretion is the major role of kidneys in marine teleost fishes. It has been suggested that cartilaginous fishes also excrete excess SO42− via the kidney. However, little is known about the underlying mechanisms for SO42− transport in cartilaginous fish, largely due to the extraordinarily elaborate four-loop configuration of the nephron, which consists of at least 10 morphologically distinguishable segments. In the present study, we determined cDNA sequences from the kidney of holocephalan elephant fish ( Callorhinchus milii) that encoded solute carrier family 26 member 1 (Slc26a1) and member 6 (Slc26a6), which are SO42− transporters that are expressed in mammalian and teleost kidneys. Elephant fish Slc26a1 (cmSlc26a1) and cmSlc26a6 mRNAs were coexpressed in the proximal II (PII) segment of the nephron, which comprises the second loop in the sinus zone. Functional analyses using Xenopus oocytes and the results of immunohistochemistry revealed that cmSlc26a1 is a basolaterally located electroneutral SO42− transporter, while cmSlc26a6 is an apically located, electrogenic Cl−/SO42− exchanger. In addition, we found that both cmSlc26a1 and cmSlc26a6 were abundantly expressed in the kidney of embryos; SO42− was concentrated in a bladder-like structure of elephant fish embryos. Our results demonstrated that the PII segment of the nephron contributes to the secretion of excess SO42− by the kidney of elephant fish. Possible mechanisms for SO42− secretion in the PII segment are discussed.

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