Hiding Fish: Hiding is completely natural behavior for most fish, especially when they are first introduced to their new aquarium. Just make sure you keep your fish comfortable and healthy, and he should start coming out of hiding more readily.
If you notice your koi has lost most of it's buoyancy control and does not ever swim normally, it's likely the swim bladder. If the strange swimming behaviour is random, and there is periods of normal swimming, it may instead be related to very poor water conditions (i.e. ammonia poisoning).
Predator proof your pond today. Predators arrive at your pond by many routes: On the land: Raccoons, opossums, muskrats, beavers, otters, foxes, or even bears may eat your fish. Though deer will not eat your fish, they might take a break from your garden to graze on your pond plants.
Sometimes if the water temperature stays warm long enough, the fish will spawn more than once. In warmer climates outdoor goldfish might spawn two or three times a season. In aquariums, if the water temperature remains pretty much the same, they may spawn all year long.
Goldfish survive below-freezing temperatures by going into hibernation, but only if they receive plenty of oxygen. Keeping ice off part of your pond is crucial. The fact is, keeping your goldfish alive outdoors during the winter requires year-round diligence -- but not a lot of your time.
Do Goldfish Eat Dead Fish? If a fish dies in the tank there is a good chance that the goldfish will try to eat it as a way to remove it from their home. They act fast too, so if a fish dies in your tank the goldfish may already begin to eat at it before you get a chance to remove it.
Goldfish by nature are not aggressive, and are not predatory. Goldfish tend to browse for food, eating mostly what are bite-sized morsels, of anything edible. But, if they happen to come across small fish (e.g. baby goldfish), they do not discern, and they will eat it if they can catch it.
Most predacious fishes swallow their prey whole, and the teeth are used for grasping and holding prey, for orienting prey to be swallowed (head first) and for working the prey toward the esophagus. Many fishes (such as the Cyprinidae or minnows) have no jaw teeth at all but have very strong throat teeth.
CONCLUSION. A significant body of scientific evidence suggests that yes, fish can feel pain. Their complex nervous systems, as well as how they behave when injured, challenge long-held beliefs that fish can be treated without any real regard for their welfare.
A fish may linger near the surface because he's trying to breathe more easily. Remember, fish breathe dissolved oxygen—not oxygen that is already combined in the H2O molecule. Naturally, these dissolved oxygen levels tend to be higher near the surface, where interaction between air and water takes place.
Goldfish have a lifespan averaging about 10-15 years, with some varieties living up to 30 years when provided with proper care. Unfortunately, many goldfish do not reach their lifespan potential due to inadequate housing conditions.
Cannibalism among aquarium fish (i.e., fish-eating each other) is common, but sometimes these do end up gobbling there cohorts. There is no definite answer to why this happens. Sometimes it's natural, while sometimes it's due to fish being opportunistic.
How long does a fish live?
Siamese fighting fish: 2 – 5 years
Common carp: 20 years
Wels catfish: 60 years
Northern pike: 7 – 10 years
Mahi-mahi: 7 years
Once they have found a garden pond with a rich food source they are very persistent. Foxes, crows and cats are less likely to steal fish but if it is an easy meal – the threat of these animals is real.
Poor water quality is the biggest killer of fish in both ponds and aquariums so buy a master test kit and test for pH, ammonia, nitrite and nitrate. pH should be 7-8 so if the pH is very high (9 or above,) that can kill fish and make ammonia more toxic.
Rats. Rats are great swimmers, and ponds provide lots of feeding opportunities for them, including eating your fish food. They can predate on other animals, too — I've seen them taking baby ducks, so they may have a go at a sluggish fish.
Seagulls will take small fish and plugs of flesh out of fish that cant dive deep enough to get away. Rather than blasting the hell out of the place I would recommend some netting to cover the pond.
Frogs do indeed eat goldfish -but only younger, littler goldfish, or those that swim too slowly. They will leave alone goldfish that are larger. Frogs also do not generally eat Orfe or Koi.
A pond alone is unlikely to attract rats, so it would only happen if they're already present and visiting for another reason.
High Risk Pond Fish Predators (US & UK)
- 1) Herons.
- 2) Domestic & Feral Cats.
- 3) Raccoons.
- 1) River Otters.
- 2) Opossums.
- 3) Birds of Prey.
- 4) Snakes.
- 1) Wild & Domestic Dogs.
Larger ponds may attract bald eagles and ospreys. But many other water birds include fish as a part of their normal diet. Loons, grebes, coots and even ducks make short migratory stops on ponds and lakes to eat small fish. Mergansers (common, hooded and red-breasted), in fact, are ducks specially adapted to eat fish.
Ponds. Rats need to drink. If you have bushes or a rockery around the pond it may, but is unlikely, be enough to provide shelter for rats to set up home. Personally I would keep the pond for its benefit to your garden wildlife.
