Krill eat phytoplankton and tiny single-celled plants and algae. Most species of krill are omnivorous filter feeders, although there are some carnivorous species that eat the larvae of fish and zooplankton. Most krill use their frontal appendages to form fine combs, which allow them to filter food from the water.
Krill are crustaceans similar to shrimp, and they are an essential link in the global food chain. Without krill, countless aquatic creatures all over the world would become extinct. Hundreds of species of fish, penguins, seals, birds and whales depend on krill as their primary food source. For example, in 1998, declining krill populations are believed to have caused salmon not to breed for a season in the Bering Sea. Often ecosystem disturbances can have far-reaching consequences as the food chain is broken.
As of 2014, it's believed that global warming is causing a decline in Antarctic krill populations. As temperatures rise and the ice melts, ice-algae becomes more scarce, which is an important food source for krill. Studies have shown that the amount of krill in the Antarctic has decreased by as much as 80 percent since the 1970s. Continued declination of krill could cause a severe loss of animal life in the Antarctic. Although krill use sunlight and carbon dioxide for energy, additional sustenance is required.Learn More
Eels fall into one of two categories: short fin and long fin. Depending on which class they are grouped into, eels vary in size and ideal habitat. Some live in freshwater, while others prefer salty marshes and ocean habitats.Full Answer >
There are two primary types of aquaculture, which are freshwater and marine aquaculture. Aquaculture is also referred to as shellfish farming or fish farming, and it involves the entire process of breeding, raising and harvesting various organisms in aquatic environments. Aquaculture involves the reproduction of numerous organisms, including many species of plants and aquatic animals.Full Answer >
A clam uses its singular foot to dig down into the sand and draw nourishment into its palps, which are filled with mucus. The clam uses a filter-like siphon to transport food into its mouth, where a second filter-like siphon removes water.Full Answer >
Cnidaria reproduce sexually or asexually. Some cnidaria are monoecious and only have one sex, while others are dioecious and contain both sexes. Cnidaria is a phylum of animals that includes jellyfish, coral and sea anemones.Full Answer >