Least Concern Archives - Page 2 of 3 - Oceana

Tropical Two-wing Flyingfish

Tropical two-wing flyingfish feed on plankton crustaceans and other small invertebrates. They have large eyes and excellent eyesight and can therefore hunt and eat individual plankton. This is in stark contrast to the very large-bodied filter feeders (like the whale shark or basking shark), which blindly filter huge volumes of water in order to obtain sufficient food. Tropical two-wing … Read more

Summer Flounder

Like all flatfishes, summer flounder have both of their eyes on the same side of their heads, and they live on the seafloor, lying on their blind side, with their eyes facing the open water column. This species is one of several “sand flounders,” with both eyes on the left side of the head. Amazingly, when they … Read more

Spotted Ratfish

Like sharks and rays, the chimaeras have skeletons made of cartilage rather than bone. This characteristic links those three groups of fishes and distinguishes them from the bony fishes. The spotted ratfish is a generalist predator and eats a variety of invertebrates and fishes associated with the seafloor. These include crabs, clams, and other hard-shelled prey, and the … Read more

Skipjack Tuna

The skipjack tuna is a common species in the open ocean that forms very large schools, often around floating objects. A single floating log or slowly moving adult whale shark may have tens of thousands of skipjack around it. There are several hypotheses as to why this phenomenon occurs, but scientists generally agree that skipjack use these objects – … Read more

Peruvian Anchoveta

Peruvian anchoveta are filter feeders that rely, in some seasons, on microscopic algae (called diatoms) as their primary food source. During other times of the year, they rely more heavily on small, pelagic crustaceans. Though they filter very small prey, they use their relatively large eyes and exceptional eyesight to increase the density of prey in the … Read more

Pacific Sardine

Pacific sardines are filter feeders that feed on a variety of phytoplankton and zooplankton. Though they filter very small prey, they use their relatively large eyes and exceptional eyesight to increase the density of prey in the water that they filter. This strategy is in stark contrast to that used by the very large bodied filter feeders … Read more


The swordfish’s bill differs from those of the other billfishes by being flat and blunt, rather than round and pointed. Like many open ocean bony fishes, swordfish start out as extremely tiny larvae, no more than a few millimeters long and weighing only a few hundredths of a gram. Soon after hatching, they already have a visible … Read more

Bluehead Wrasse

It gets its common name from the adult coloration, which includes an obviously blue head on an otherwise green body. Juveniles are solid yellow, or nearly so, with a black spot on the dorsal fin. The numerical success of the bluehead wrasse is apparent to anyone who has visited a Caribbean reef; it is one of the … Read more

Banded Butterflyfish

Though generally considered to be foraging predators, which lazily search the reef surface for food, Banded butterflyfish actually utilize a variety of feeding strategies. Some (often in pairs) do forage on the reef surface. Others form larger schools that visually hunt tiny plankton in the water column above the reef. Still others are known to engage in cleaning … Read more

Queen Parrotfish

Queen parrotfish are herbivores that graze the reef, using their beaks to scrape plants and algae from the reef surface. Oftentimes, this habit involves ingesting corals and other animals as well, but they are primarily herbivorous. Through their feeding strategies, parrotfishes create much of the sand around a reef. Upon eating some species of calcareous algae (i.e., … Read more