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The satiety hormone cholecystokinin gates reproduction in fish by controlling gonadotropin secretion.
Elife
December 2024
Department of Animal Sciences, The Robert H. Smith Faculty of Agriculture, Food, and Environment, Hebrew University of Jerusalem, Rehovot, Israel.
Life histories of oviparous species dictate high metabolic investment in the process of gonadal development leading to ovulation. In vertebrates, these two distinct processes are controlled by the gonadotropins follicle-stimulating hormone (FSH) and luteinizing hormone (LH), respectively. While it was suggested that a common secretagogue, gonadotropin-releasing hormone (GnRH), oversees both functions, the generation of loss-of-function fish challenged this view.
View Article and Find Full Text PDFThe Hybrid History of Zebrafish.
G3 (Bethesda)
December 2024
Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA.
Since the description of zebrafish (Danio rerio) in 1822, the identity of its closest living relative has been unclear. To address this problem, we sequenced the exomes of ten species in genus Danio, using the closely related Devario aequipinnatus as outgroup, to infer relationships across the 25 chromosomes of the zebrafish genome. The majority of relationships within Danio were remarkably consistent across all chromosomes.
View Article and Find Full Text PDFLiquid mosquito repellent induces toxic effects in zebrafish.
Drug Chem Toxicol
December 2024
Toxicology and Pharmacology Laboratory, Department of Biotechnology, Faculty of Science and Humanities, SRM Institute of Science and Technology, Kattankulathur, Chengalpattu District, Tamil Nadu, India.
Mosquitoes serve as vectors for life-threatening parasitic diseases, presenting a continuous threat throughout human history. This has resulted in the extensive utilization of various mosquito repellents, including liquid mosquito repellents (LMRs), roll-ons, and topical creams. While these products demonstrate significant efficacy, the toxicological implications associated with their use are not yet fully understood and continue to be a subject of debate.
View Article and Find Full Text PDFHabitat loss and discontinuity as drivers of habitat fragmentation: The role of contamination and connectivity of habitats.
Environ Res
December 2024
. Institute of Marine Sciences of Andalusia (CSIC), Department of Ecology and Coastal Management, Campus Universitario Río San Pedro, s/n, 11510, Puerto Real, Spain.
Habitat discontinuity of aquatic environments is a serious problem that might hamper the different activities performed by organisms. When combined with contamination, the consequences for the population's dynamics might be exacerbated, particularly regarding foraging activity. Therefore, the aim of this study was to evaluate the combined effects of habitat discontinuity and contamination on the foraging behavior by zebrafish (Danio rerio) and on their ability to explore heterogeneous landscapes.
View Article and Find Full Text PDFA transient neurohormonal circuit controls hatching in fish.
Science
December 2024
Department of Aquaculture and Poultry, Institute of Animal Sciences, Agricultural Research Organization, Volcani Center, Rishon Letziyon, Israel.
Article Synopsis
- Hatching is a crucial event for egg-laying species, timed to enhance survival during early life stages.
- Researchers discovered that thyrotropin-releasing hormone (Trh) triggers hatching in zebrafish by creating a temporary circuit that delivers the hormone into the embryo's bloodstream.
- The study also found that Trh stimulates hatching in a related fish species, highlighting a long-evolved neuroendocrine mechanism controlling this important life event in oviparous fish.
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