Shark Skin Secrets: How Bonnetheads Grow and Glow

Sharks possess a unique skin covered in tiny, tooth-like scales called denticles. These denticles enhance swimming speed and provide protection during mating.

The Study

Scientists investigated whether these denticles change as sharks grow and if there are differences between male and female sharks.

• Subjects: 24 bonnethead sharks (both male and female) at various life stages.
• Focus Area: Skin between the first and second dorsal fins.
• Tools: Powerful microscope to measure denticle shape, size, and overlap.

Findings

• Growth Impact: Denticle shape, size, and overlap change as sharks grow, improving swimming and protection.
• Sex Differences: Surprisingly, sex did not significantly affect denticle shape, except for the angle of the ridges.

Conclusion

As sharks grow, their denticles adapt to enhance swimming efficiency and protection. Understanding these changes provides insights into shark evolution and survival strategies.