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.
Scientific Name: Oncorhynchus mykiss (Previous names include Salmo gairdneri and Salmo irideus. There are several subspecies.). Description: Rainbow trout/steelhead are ray-finned fishes in the salmon family, and they are one of the top sport fish in North America. Rainbow trout and steelhead are the same species, but they have different lifestyles.