Predatory fish for a 55 gallon

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They have great personalities and can be incredibly tough, but they are not really a beginner fish for many reasons. First of all, standard adults can grow to well over a foot in length. While many decide to house their first goldfish in a bowl, unlike the betta (probably the runner-up in the most abused category) they are incredibly unsuited for such an environment. They need a much larger amount of oxygen in their water than most other fish. Without any water movement, the goldfish will slowly perish. Most people are surprised to learn that goldfish can live as long as twenty years. Most die within the first few months because people don't understand how to meet their basic needs. Fish do not grow to the size of their environment. Placing a goldfish in a small tank or bowl will cause it to die a slow painful death. Common goldfish should be kept in large outdoor ponds or extremely large indoor tanks if they are to do well longterm.

So what are the requirements to successfully keep goldfish? I am going to discuss only the fancy varieties because they are the ones most suited for life in an aquarium. Again, keep the larger common goldfish in ponds. First of all, the fancy varieties of goldfish are much more fragile than the unaltered forms, but they can be housed in much smaller quarters. A 55 gallon aquarium can keep three fancy goldfish comfortably for their entire lifespans (which are cut to about ten years due to health problems). There are quite a few varieties to choose from, but I would stay away from the more severely deformed specimens. You must provide good filtration and aerate the water adequately. Goldfish are extremely messy, and they like to have clean water. That is not a good combination. A powerful filter and frequent water changes are a must. At least change 25% of the water weekly to keep your goldfish in top shape. Cleaning the tank is also a must as they tend to be messy eaters leaving the leftovers to rot in the tank. In addition, goldfish are a coldwater fish. They CANNOT be housed with tropical fish. They do NOT need heaters in their tank. The higher temperatures reduce the oxygen levels in the water causing stress for the goldfish. Goldfish really should be housed with only other goldfish. If you really want to have tankmates, I can suggest white cloud mountain minnows, butterfly loaches, and apple snails as a few species that may do well with goldfish. Goldfish also happily consume live plants. Only java fern, moss, and anubias species will go untouched. Their diets need to be varied. A good quality pellet food made specifically for goldfish mixed with some green vegetable occasionally is a good start. Once again, goldfish can make excellent pets if their basic requirements are met, but they really require some effort on their owner's part. Give them a try once you have the basics of fishkeeping figured out.


Impact of spear fishing on the abundance of large predatory coral reef fishes
Book (The University)

Do we really want to save it?

2008-09-23 06:43:39 by oikos

The article does not mention that the sea lamprey is not a native fish and that salmon were existing quite nicely without them, seals and sea lions notwithstanding. Further the article glosses over the fact that the adult sea lamprey is parasitic/predatory (the definition breaks down with them) on the adult salmon, negating the supposed benefit of providing alternate prey for the pinnipeds. There are, however, non-parasitic lampreys that would provide the benefits without the drawbacks.


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