Sand eels eat tiny pieces of mackerel
No they only eat fish.
Sand eels eat a variety of crustaceans including crab and shrimp. They are actually a species of small fish rather than an eel.
that eels can travl on wet grass and wet sand
Eels that live in the sand at beaches are typically species like the sand eel or the surf eel, which inhabit shallow coastal waters. These eels often burrow into the sandy substrate to hide from predators and ambush prey, feeding on small fish and invertebrates. Their elongated bodies and smooth skin allow them to navigate easily through the sand. They play an important role in the marine ecosystem by contributing to nutrient cycling and serving as prey for larger fish and birds.
Sand eels are about 5" long.
Eels live in holes and crevices in the corals.
The mathematical relationship is direct (not inverse), because sand eels feed on herring, and as the herring decrease, so decreases the sand eels' food supply. Please note that sand eels are not to be confused with the gigantic variety of species called sand worms, as depicted in the 1988 movie Beetle Juice. These creatures feed solely on actors and film crews.
Snakes live on land and eels live in the water.
Electric eels live in the amazon of South America
yes under water
A decrease in the number of herring could lead to a decrease in sand eels because herring are a key predator of sand eels in the marine food web. With fewer herring, the population dynamics may shift, potentially allowing other predators, such as larger fish or seabirds, to thrive and increase their predation on sand eels. Additionally, the loss of herring could disrupt the overall ecosystem balance, affecting prey availability and habitat conditions that sand eels rely on for survival.