Gasterosteus aculeatus
( Threespine, right )
Apeltes quadracus
( Fourspine, below )
Size:
to 4" (threespine)
to 2" (fourspine)
Habitat:
Weedy shore waters, occasionally at sea or even in freshwater.
Notes:
Sticklebacks are related to Pipefish and Seahorses. Three- and four-spined varieties are common in our area. A Ninespine variety is also possible.
Scuba tanks are made out of steel or aluminum. Aluminum is cheaper and has somewhat better corrosion resistance, but steel is stronger. The "standard" modern scuba cylinder is the aluminum "80", which actually holds about 77 cubic feet of air at its rated pressure of 3000 psi. This type of tank has probably caught on because for an average-sized person with reasonably good breathing skills, this size is just big enough to cover your allowable no-decompression bottom time and no more. For smaller people, 63 cubic foot aluminum tanks are available, while for larger folks there are choices as big as 120 cuft.
More: Main Tanks & Bands ...
