Offspring production with cryopreserved sperm from a live-bearing fish Xiphophorus maculatus and implications for female fecundity

Maternal Size and Age Shape Offspring Size in a Live-Bearing Fish, Xiphophorus birchmanni

Many studies of offspring size focus on differences in maternal investment that arise from ecological factors such as predation or competition. Classic theory predicts that these ecological factors will select for an optimal offspring size, and therefore that variation in a given environment will be minimized. Yet recent evidence suggests maternal traits such as size or age could also drive mea...

Short communication: Occurrence of squamous cell carcinoma in a platy fish (Xiphophorus maculatus): A case report

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A model for optimal offspring size in fish, including live-bearing and parental effects.

Since Smith and Fretwell's seminal article in 1974 on the optimal offspring size, most theory has assumed a trade-off between offspring number and offspring fitness, where larger offspring have better survival or fitness, but with diminishing returns. In this article, we use two ubiquitous biological mechanisms to derive the shape of this trade-off: the offspring's growth rate combined with its...

Production of live offspring from testicular tissue cryopreserved by vitrification procedures in Japanese quail (Coturnix japonica).

Cryopreservation of testicular tissue can be used for ex situ conservation of male germplasm of avian species. The possibility of using vitrification and transplantation of testicular tissue for fertility preservation and recovery was tested in Japanese quail. Testes were removed from 1-wk-old Japanese quail; transfixed on acupuncture needles; equilibrated with dimethyl sulphoxide, ethylene gly...

Short communication: Occurrence of squamous cell carcinoma in a platy fish (Xiphophorus maculatus): A case report