Positive Effects
* Humans provide eels with food sources, such as fish and crab scraps, which can help them grow and thrive.
* Humans can create suitable habitats for eels by building dams and other structures that create deep, slow-moving waters.
* Humans can also help eels to reproduce by building fish ladders and other devices that allow them to bypass dams and other barriers.
Negative Effects
* Human activities can pollute water bodies and damage the habitats of eels.
* Humans can also overfish eels, leading to population declines.
* Humans can also introduce invasive species into water bodies, which can compete with eels for food and habitat.
In general, humans have a greater negative impact on eels than a positive one. However, there are steps that can be taken to mitigate these negative effects and help eels to thrive.