They can be, but protection varies by garment. Check the individual shirt for a stated UPF rating, coverage and fabric details rather than assuming every fishing shirt provides the same protection. A long-sleeve shirt can form part of a broader sun-protection setup alongside a hat, sunglasses, shade and sunscreen used as directed.
What is the difference between fishing shirts and regular shirts?
Fishing shirts are usually lighter, quicker drying and more sun-focused than regular shirts. They often include breathable fabric, long sleeves, vents or UPF-style protection for outdoor use.