I N T R O D U C T I O N During the experiments with their bathyscaphe P6r£s, Picard, and Ruivo (1958) at a depth of 2200 m observed fishes (Halosaurus johnsonii) which floated. These fishes have therefore the same density as the surrounding water. T h e density of a fish without a gas-filled swim-bladder is practically independent of depth and it is a few percent higher than the density of the ...

paraschistura prokofiev, 2009 is a newly described genus based on osteological characters, but detailed information for all species of the genus is not available. to describe osteological characteristics of the endemic species of paraschistura nielseni , twelve specimens were collected from the shapur river of persis basin which drains to the persian gulf and their osteological characteristics ...

This Adverse Outcome Pathway (AOP) describes the linkage between Deiodinase 2 inhibition and increased mortality via reduced posterior swim bladder inflation. The is a gas-filled organ found in many bony fish species typically consists of two chambers. chamber inflates during early development (embryo), while anterior late (larva). Both chambers are important for to control buoyancy has an addi...

This Adverse Outcome Pathway (AOP) describes the linkage between Deiodinase 1 inhibition and increased mortality via reduced posterior swim bladder inflation. The is a gas-filled organ found in many bony fish species typically consists of two chambers. chamber inflates during early development (embryo), while anterior late (larva). Both chambers are important for to control buoyancy has an addi...

Dolphins that emit whistle signals (except for sperm whales) project short broadband biosonar clicks containing about 5 to 7 cycles with exponential decaying envelope and Q (center frequency over bandwidth) between 2 and 3. The broadband nature of the biosonar clicks allow for good temporal resolution of echo highlights which in turn allows for the discriminations of different targets including...

During parasitological surveys of freshwater fish from the Miranda River, Brazil, 199 Pygocentrus nattereri Kner (Characidae) were caught. Two pentastomid families, Subtriquetridae Fain, 1961, represented by its single genus Subtriquetra Sambon, 1922, and Sebekidae Sambon, 1922, represented by three genera, were present. Free-living larvae of Subtriquetra subtriquetra (Diesing, 1835) were colle...

A novel defensin antimicrobial peptide gene was identified in Atlantic cod, Gadus morhua. This three exon/two intron defensin gene codes for a peptide precursor consisting of two domains: a signal peptide of 26 amino acids and a mature peptide of 40 residues. The mature cod defensin has six conserved cysteine residues that form 1-5, 2-4 and 3-6 disulphide bridges. This pattern is typical of bet...

The mammalian aquaporins AQP1, AQP4, and AQP5 have been shown to function not only as water channels but also as gas channels. Zebrafish have two genes encoding an AQP1 homologue, aqp1a and aqp1b. In the present study, we cloned the cDNA that encodes the zebrafish protein Aqp1a from the 72-h postfertilization (hpf) embryo of Danio rerio, as well as from the swim bladder of the adult. The deduce...