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Sexual maturity in western Atlantic bluefin tuna

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ABSTRACT

We introduce a novel endocrine approach for assessing the unresolved matter of the timing of sexual maturation in western Atlantic bluefin tuna (ABFT), a highly migratory population whose status remains uncertain. Ratios of follicle stimulating hormone to luteinizing hormone, a sexual maturity indicator, in all ABFT ≥134 cm curved fork length (CFL) were <0.4, similar to Mediterranean spawners, indicating that western ABFT mature at considerably smaller sizes and at a much younger age than currently assumed (≥185 cm CFL).

No MeSH data available.


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Mean FSH/LH ratios.Protein FSH levels (µg/pit/BW) divided by protein LH levels (µg/pit/BW) for each individual and then averaged for comparison. On the X axis are the fish grouped by size: A ≥185; B 134–185; C ≤37 (CFL length in cm). All fish, males and females >134 cm CFL had FSH/LH protein ratios <0.36 (average: 0.1 ± 0.08). All YOY ABFT (≤37 cm) were sampled on 13 September 2008 off Virginia, USA. FSH/LH ratio for YOYs ranged between 2.00 and 46.05. For statistical comparison data were normalized using arcsine transformation, and confirmed by Shapiro-Wilk W test. Letters above error bars (SDV) indicate significant difference between means (Tukey-Kramer, α = 0.05), Numbers of samples (n).
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f4: Mean FSH/LH ratios.Protein FSH levels (µg/pit/BW) divided by protein LH levels (µg/pit/BW) for each individual and then averaged for comparison. On the X axis are the fish grouped by size: A ≥185; B 134–185; C ≤37 (CFL length in cm). All fish, males and females >134 cm CFL had FSH/LH protein ratios <0.36 (average: 0.1 ± 0.08). All YOY ABFT (≤37 cm) were sampled on 13 September 2008 off Virginia, USA. FSH/LH ratio for YOYs ranged between 2.00 and 46.05. For statistical comparison data were normalized using arcsine transformation, and confirmed by Shapiro-Wilk W test. Letters above error bars (SDV) indicate significant difference between means (Tukey-Kramer, α = 0.05), Numbers of samples (n).

Mentions: We detected a significant difference (p < 0.05) in the FSH/LH ratio between YOYs and ABFT larger than 134 cm CFL (Fig. 4). The mean ratio for the YOY was 17.1 ± 17.53, with individual ratios ranging between 2.0 and 46.05. The FSH/LH ratio was < 0.36 in all other fish, with a minimum ratio of 0.01. We did not detect significant differences in the mean FSH/LH ratios between fish 134–185 cm CFL vs. ≥185 cm CFL (p < 0.05).


Sexual maturity in western Atlantic bluefin tuna
Mean FSH/LH ratios.Protein FSH levels (µg/pit/BW) divided by protein LH levels (µg/pit/BW) for each individual and then averaged for comparison. On the X axis are the fish grouped by size: A ≥185; B 134–185; C ≤37 (CFL length in cm). All fish, males and females >134 cm CFL had FSH/LH protein ratios <0.36 (average: 0.1 ± 0.08). All YOY ABFT (≤37 cm) were sampled on 13 September 2008 off Virginia, USA. FSH/LH ratio for YOYs ranged between 2.00 and 46.05. For statistical comparison data were normalized using arcsine transformation, and confirmed by Shapiro-Wilk W test. Letters above error bars (SDV) indicate significant difference between means (Tukey-Kramer, α = 0.05), Numbers of samples (n).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5384251&req=5

f4: Mean FSH/LH ratios.Protein FSH levels (µg/pit/BW) divided by protein LH levels (µg/pit/BW) for each individual and then averaged for comparison. On the X axis are the fish grouped by size: A ≥185; B 134–185; C ≤37 (CFL length in cm). All fish, males and females >134 cm CFL had FSH/LH protein ratios <0.36 (average: 0.1 ± 0.08). All YOY ABFT (≤37 cm) were sampled on 13 September 2008 off Virginia, USA. FSH/LH ratio for YOYs ranged between 2.00 and 46.05. For statistical comparison data were normalized using arcsine transformation, and confirmed by Shapiro-Wilk W test. Letters above error bars (SDV) indicate significant difference between means (Tukey-Kramer, α = 0.05), Numbers of samples (n).
Mentions: We detected a significant difference (p < 0.05) in the FSH/LH ratio between YOYs and ABFT larger than 134 cm CFL (Fig. 4). The mean ratio for the YOY was 17.1 ± 17.53, with individual ratios ranging between 2.0 and 46.05. The FSH/LH ratio was < 0.36 in all other fish, with a minimum ratio of 0.01. We did not detect significant differences in the mean FSH/LH ratios between fish 134–185 cm CFL vs. ≥185 cm CFL (p < 0.05).

View Article: PubMed Central - PubMed

ABSTRACT

We introduce a novel endocrine approach for assessing the unresolved matter of the timing of sexual maturation in western Atlantic bluefin tuna (ABFT), a highly migratory population whose status remains uncertain. Ratios of follicle stimulating hormone to luteinizing hormone, a sexual maturity indicator, in all ABFT &ge;134&#8197;cm curved fork length (CFL) were &lt;0.4, similar to Mediterranean spawners, indicating that western ABFT mature at considerably smaller sizes and at a much younger age than currently assumed (&ge;185&#8197;cm CFL).

No MeSH data available.


Related in: MedlinePlus