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.
Fantails are another popular goldfish types. Fantail goldfish have rounded bodies. Fantails have a large double tail and come in many colors. The calico- which is white, red, and black, is one of the most popular fantails. Because of the fantails short, squat body they are slow swimmers, they prefer being kept with fish of a similar size and speed.