January 11, 2011. 1  According to Education Next, teachers retire, on average, at around the age of 58. AARP reports that 33 percent of all beginning teachers leave the teaching profession within three years of beginning their careers, but the majority of teachers continue teaching and can reap retirement benefits later in life.
Deep-sea anglerfish, hatchetfish, and lantern fish are among the best-known luminescent fishes. In most such fishes, luminescence is produced intracellularly; the light is emitted by special cells called photocytes. The anatomical structure of the luminous organs of many fishes is similar to that of squids.
There are a few natural species of glowing freshwater fish. One example is the Japanese freshwater green eel, which contains a fluorescent protein in its body that causes it to glow... There are a few natural species of glowing freshwater fish. One example is the Japanese freshwater green eel, which contains a fluorescent protein in its body that causes it to glow green. Glowing freshwater fish that are purchased in a pet store are genetically engineered to glow, and many species of fish are available with added bioluminescence. Bioluminescence is natural light produced by chemical reactions occurring within the organism, and it is the primary light source in dark waters.