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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.


Ovaries.Micrographs of ABFT ovaries sampled during June–July in the NW Atlantic (top) and August-September (bottom). Top left- 190 cm CFL; Top right- 162 cm CFL; Bottom left- 205 cm CFL; Bottom right- 156 cm CFL. PN - perinucleolar stage; LP - lipid stage; Vtg – vitellogenic oocyte. Bar = 300 µm.
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f2: Ovaries.Micrographs of ABFT ovaries sampled during June–July in the NW Atlantic (top) and August-September (bottom). Top left- 190 cm CFL; Top right- 162 cm CFL; Bottom left- 205 cm CFL; Bottom right- 156 cm CFL. PN - perinucleolar stage; LP - lipid stage; Vtg – vitellogenic oocyte. Bar = 300 µm.

Mentions: The majority of oocytes from females (≥134 cm CFL) sampled in the NW Atlantic were in the perinucleolar stage (i.e. primary growth), with no visual difference observed between females of different sizes. Lipid stage oocytes (also termed cortical alveolar27) were also present in females across the entire size range (Fig. 2). All testes were partially spent (Fig. 3). Milt was present in testes of males of all sizes during June–August. In one case (145 cm CFL male sampled on August 27, 2008), milt was flowing freely from the testis when sectioned, an indication of male sexual maturity40.


Sexual maturity in western Atlantic bluefin tuna
Ovaries.Micrographs of ABFT ovaries sampled during June–July in the NW Atlantic (top) and August-September (bottom). Top left- 190 cm CFL; Top right- 162 cm CFL; Bottom left- 205 cm CFL; Bottom right- 156 cm CFL. PN - perinucleolar stage; LP - lipid stage; Vtg – vitellogenic oocyte. Bar = 300 µm.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f2: Ovaries.Micrographs of ABFT ovaries sampled during June–July in the NW Atlantic (top) and August-September (bottom). Top left- 190 cm CFL; Top right- 162 cm CFL; Bottom left- 205 cm CFL; Bottom right- 156 cm CFL. PN - perinucleolar stage; LP - lipid stage; Vtg – vitellogenic oocyte. Bar = 300 µm.
Mentions: The majority of oocytes from females (≥134 cm CFL) sampled in the NW Atlantic were in the perinucleolar stage (i.e. primary growth), with no visual difference observed between females of different sizes. Lipid stage oocytes (also termed cortical alveolar27) were also present in females across the entire size range (Fig. 2). All testes were partially spent (Fig. 3). Milt was present in testes of males of all sizes during June–August. In one case (145 cm CFL male sampled on August 27, 2008), milt was flowing freely from the testis when sectioned, an indication of male sexual maturity40.

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 ≥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.