Pumpkinseed Sunfish

Pumpkinseed Sunfish

Sunfishes ( family Centrarchidae, along with freshwater basses ) thrive in small, shallow lakes, sheltered bays of larger lakes, and quiet areas of slow-moving streams. Pumpkinseeds (right) are normally found in shallower water and denser vegetation than Bluegills and Redears. Adult and larval insects make up most of the diet, but sunfishes also eat snails and fish fry.

Sunfishes spawn in later spring or early summer, usually at water temperatures from 66°F to 70°F. Males build the nests on a sand or fine gravel bottom at depths from 6 to 18 inches. After spawning, males guard the eggs and fry. In one study, males were seen apparently eating fry that had strayed from the nest, but closer observation revealed that they carried the fry back and spat them out on the nest.

Sunfishes may live up to 10 years. They grow slightly faster in the northern states and Canada than in the southern part of their range, probably because of their preferences for cooler water. Males grow somewhat faster than females.

Pumpkinseed Sunfish
The Pumpkinseed - probably our most attractive native freshwater fish.
Longear Sunfish

While most of the local Sunfish species are attractive, none are as spectacular as the midwestern Longear Sunfish, especially when it is in breeding colors.


The proper way to fill a scuba cylinder is very slowly so that the heat generated by the filling process can be bled away as it happens, and the tank does not become overheated. That's a great theory, but in real life, nobody does it that way. Most tanks are "hot-filled", that is to say, that they are filled too fast to prevent them from heating up during the process. If they are filled directly off a compressor, then they will receive a very hot fill. You would be surprised how warm the surface of a tank can get. This is not much of a safety issue, though, as it is well within the thermal limits of the material, either aluminum or steel.

The real issue here is that eventually ( after a few hours ) the tank will cool down, and as it does, the air inside will contract, and the pressure will drop. This typically results in about a 10% loss of pressure. At this point, you could top it off to the rated pressure again and have a truly full tank. Most of the time that's not an option. Therefore, if the shop hot-fills your tank to 3000, you will end up with 2700. To get 3000, you need to fill the tank to about 3300. While this is verboten, it is well within the 5/3 overpressure of the hydro test, and realistically there is no danger. The slight overpressure may wear out your o-rings a little faster, but o-rings are cheap - get a dozen of them at the hardware store for a buck.

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