According to the Chesapeake Bay program experts, they are:
Sandbar shark: the most common shark in the bay. It’s found in the Atlantic Ocean from Massachusetts to Brazil.
Bull shark: a close cousin to the sandbar shark, but more aggressive. Many shark attacks are attributed to the bull shark, which ventures as far north as the Patuxent River, although the Chesapeake Bay Program says it’s not considered a “significant threat” to human safety.
Sand tiger shark: a common visitor to the lower bay in summer and fall, most often feeding along the bottom of the estuary and active at night. With its jagged teeth and size, it looks dangerous, but there have been no recorded attacks on humans.
Smooth dogfish: a common to abundant visitor to the bay, especially the lower part and as far north as the Patuxent. They usually travel in schools.
Spiny dogfish: commonly found in the lower bay south of the Potomac River in late fall through early spring. Like the smooth dogfish, it travels in schools, but is a slower swimmer and inhabits deeper waters. It’s found in temperate coastal waters and in all the world’s oceans.
Less common or infrequent visitors to the bay include the basking shark, the bonnethead, the smooth hammerhead and the Atlantic angel shark.