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. 2019 Dec 13;102(4):876–887. doi: 10.1093/biolre/ioz221

Figure 3.

Figure 3

Testosterone concentration for in situ sand tiger sharks. Immature sharks have lower plasma testosterone than mature sharks during summer (A). For mature sharks, testosterone is highest in April, the breeding season, and decreases to a nadir by late summer when they are no longer breeding (B). Different letters indicate significant (P < 0.05) differences among the groups.