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Melanotaenia splendida

ABSTRACT: Melanotaenia splendida overview

PROVIDER: PRJNA369703 | ENA |

REPOSITORIES: ENA

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Dataset's files

Source:

			Action	DRS
	SRR5223651_1.fastq.gz	Fastqsanger.gz
	SRR5223651_2.fastq.gz	Fastqsanger.gz
	SRR5223652_1.fastq.gz	Fastqsanger.gz
	SRR5223652_2.fastq.gz	Fastqsanger.gz
	SRR5223653_1.fastq.gz	Fastqsanger.gz

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Predator recognition in rainbowfish, Melanotaenia duboulayi, embryos.

Project description:Exposure to olfactory cues during embryonic development can have long term impacts on birds and amphibians behaviour. Despite the vast literature on predator recognition and responses in fishes, few researchers have determined how fish embryos respond to predator cues. Here we exposed four-day-old rainbowfish (Melanotaenia duboulayi) embryos to cues emanating from a novel predator, a native predator and injured conspecifics. Their response was assessed by monitoring heart rate and hatch time. Results showed that embryos have an innate capacity to differentiate between cues as illustrated by faster heart rates relative to controls. The greatest increase in heart rate occurred in response to native predator odour. While we found no significant change in the time taken for eggs to hatch, all treatments experienced slight delays as expected if embryos are attempting to reduce exposure to larval predators.

| S-EPMC3797706 | biostudies-literature

Cryopreservation of testicular tissue from Murray River Rainbowfish, Melanotaenia fluviatilis.

Project description:Globally, fish populations are in decline from overfishing, habitat destruction and poor water quality. Recent mass fish deaths in Australia's Murray-Darling Basin highlight the need for improved conservation methods for endangered fish species. Cryopreservation of testicular tissue allows storage of early sperm precursor cells for use in generating new individuals via surrogacy. We describe successful isolation and cryopreservation of spermatogonia in an Australian rainbowfish. Testis histology showed rainbowfish spermatogonia are large (>?10 ?m) and stain positive for Vasa, an early germ line-specific protein. Using size-based flow cytometry, testis cell suspensions were sorted through "A" (>?9 ?m) and "B" gates (2-5 ?m); the A gate produced significantly more Vasa-positive cells (45.0%?±?15.2%) than the "B" gate (0.0%?±?0.0%) and an unsorted control (22.9%?±?9.5%, p?<?0.0001). The most successful cryoprotectant for "large cell" (>?9 ?m) viability (72.6%?±?10.5%) comprised 1.3 M DMSO, 0.1 M trehalose and 1.5% BSA; cell viability was similar to fresh controls (78.8%?±?10.5%) and significantly better than other cryoprotectants (p?<?0.0006). We have developed a protocol to cryopreserve rainbowfish testicular tissue and recover an enriched population of viable spermatogonia. This is the first step in developing a biobank of reproductive tissues for this family, and other Australian fish species, in the Australian Frozen Zoo.

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