Reproduction and spawning patterns of the Yellowtail scad (Atule mate) were studied in the Persian Gulf and Oman Sea (Hormozgan coastal waters) from December 2016 to November 2017. A total of 447 fish were collected from Bandar Lengeh, Qeshm Island, Bandar Abbas, and Bandar Jask landing sites. Minimum and maximum fork lengths of this species were 10 and 33 cm, with average 20.63±1.73 cm. The to...

Automixis, the process whereby the fusion of meiotic products restores the diploid state of the egg, is a common mode of reproduction in plants but has also been described in invertebrate animals. In vertebrates, however, automixis has so far only been discussed as one of several explanations for isolated cases of facultative parthenogenesis. Analyzing oocyte formation in F1 hybrids derived fro...

Research into fish and amphibian reproduction has increased exponentially in recent years owing to the expansion of the aquaculture industry, the need to recover fishery populations, the impact of endocrine disruptors on the aquatic environment and the global decline of amphibian populations. This review focuses on a group of parasites, the Myxozoa, that affect fish and amphibian reproduction. ...

ABSTRACT One of the constraints in pirarucu, Arapaima gigas farming is reproduction captivity, due to inconsistent number spawning events per reproductive cycle, thus, unreliable availability juvenile fish. This a first-hand report on predation pirarucu larvae by opportunistic fish species breeding pond. Fish samples were collected for stomach content analysis from pirarucu-breeding pond with r...

Hypoxia is amongst the most widespread and pressing problems in aquatic environments. Here we demonstrate that fish (Oryzias melastigma) exposed to hypoxia show reproductive impairments (retarded gonad development, decrease in sperm count and sperm motility) in F1 and F2 generations despite these progenies (and their germ cells) having never been exposed to hypoxia. We further show that the obs...

Fish comprise half of extant vertebrate species and use a rich variety of reproductive strategies that have yielded insights into the basic mechanisms that evolved for sex. To maximize the chances of fertilization and survival of offspring, fish species time reproduction to occur at optimal times. For years, ethologists have performed painstaking experiments to identify sensory inputs and behav...

Control of reproductive function in captivity is essential for the sustainability of commercial aquaculture production, and in many fishes it can be achieved by manipulating photoperiod, water temperature or spawning substrate. The fish reproductive cycle is separated in the growth (gametogenesis) and maturation phase (oocyte maturation and spermiation), both controlled by the reproductive horm...

Purpose: to develop a technical justification of fish protection structures arranged as part the Bagaevsky hydroelectric com-plex on Don River. Materials and methods. The research was based data science, topographic, hydraulic tech-nological conditions complex. methods scientific analysis technology search design were used in development security power plant. Results discussion. com-position, t...

RDG/ The Fish Short-Term Reproductive Assay described in the Integrated Summary Report (ISR) and supported by ample supporting materials is overall an excellent approach for Tier 1 screening for chemicals that might perturb the hypothalamic-pituitary-gonadal (HPG) axis. The rationale for the design of the 21 day test, the endpoints selected, and approaches for analyzing data clearly have been c...