I'm not saying that it's completely normal, but that does not mean that it is not uncommon. I don't think that the reason your gerbil's tail fell off was because of the jagged area, but because your sister pulled him by the tail. You should NEVER do this. If you do, the tail will either deglove or just break off.
Fish Spawning. Female fish lay eggs, with the eggs being fertilized by the males in close attendance. Eggs develop more rapidly (in a few weeks) in warmer temperatures, and more slowly in colder water (up to months).Most freshwater fish spawn in the spring, although salmon, char, and some trout spawn in the fall.ish Spawning. Female fish lay eggs, with the eggs being fertilized by the males in close attendance. Eggs develop more rapidly (in a few weeks) in warmer temperatures, and more slowly in colder water (up to months).
Tank spawning is done by placing our goldfish brooders in heated tanks and allowing them to spawn over mats. This method is much more controlled as more eggs can be collected do to the location of mats as opposed to pond spawning.PAWNING-The first signs of goldfish spawning typically begins in April and can run as late as July. Ozark Fisheries uses two methods to spawn goldfish. The first method is pond spawning and the second method is tank spawning.