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Testing a Claim about Mean: Known Population SD01:11

Testing a Claim about Mean: Known Population SD

A complete procedure of testing the hypothesis about a population mean is explained here.
Estimating a population mean requires the samples to be distributed normally. The data should be collected from the randomly selected samples having no sampling bias. The sample size needed to be higher than 30, and most importantly, the population standard deviation should be already known.
In most realistic situations, the population standard deviation is often unknown, but in rare circumstances, when it...

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Rearing in captivity affects spermatogenesis and sperm quality in greater amberjack, Seriola dumerili (Risso, 1810).

R Zupa, C Fauvel, C C Mylonas

    Journal of Animal Science
    |October 10, 2017
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    Captive greater amberjack males show impaired spermatogenesis due to stress, with reduced sperm quality and increased apoptosis. Improving aquaculture practices is crucial for successful reproduction and commercial production.

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    Area of Science:

    • Aquaculture science
    • Fish reproductive biology
    • Marine biotechnology

    Background:

    • Greater amberjack (Seriola dumerili) is a viable candidate for European aquaculture diversification.
    • Inconsistent reproduction in captivity, specifically poor gonad development and interrupted gametogenesis, hinders commercial production.
    • Previous studies noted scarce gonad development and early gametogenesis interruption in captive greater amberjack.

    Purpose of the Study:

    • To investigate the causes of impaired spermatogenesis in captive greater amberjack.
    • To understand the differences in germ cell proliferation and apoptosis between wild and captive males.
    • To assess sperm quality parameters in captive greater amberjack throughout the reproductive season.

    Main Methods:

    • Comparative analysis of wild and captive-reared male greater amberjack during early gametogenesis, advanced gametogenesis, and spawning phases.
    • Immunohistochemical localization of VASA and proliferating cell nuclear antigen (PCNA) to identify germ cells.
    • Terminal deoxynucleotidyl transferase-mediated 2'-deoxyuridine 5'-triphosphate nick end labeling (TUNEL) assay for apoptosis detection.
    • Computer-assisted sperm analysis (CASA) to evaluate sperm quality.

    Main Results:

    • Captive males exhibited smaller seminiferous lobule diameter, reduced spermatogonial mitosis, and increased germ cell apoptosis at the start of the reproductive season.
    • Elevated 17β-estradiol plasma concentrations were observed in captive males.
    • Sperm quality was poor in captive fish, with decreased motility, velocity, and ATP content, alongside increased dead spermatozoa and abnormal sperm concentration during spawning.

    Conclusions:

    • Greater amberjack are highly susceptible to rearing stress, leading to gametogenesis dysfunction.
    • Stress negatively impacts spermatogenesis, germ cell apoptosis, and sperm quality in captive populations.
    • Improvements in aquaculture rearing and handling procedures are essential to overcome reproductive challenges and enhance commercial production.