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do fish grow to their tank size
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Do fish grow to suit their tank size

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binär optionen strategien There are many myths and half truths associated with fish keeping, some like “a fish will only grow to suit the tank it is kept in” are very deeply entrenched and often accepted as fact. There are many factors which affect a fish’s growth but tank size isn’t one of them. The main factors which have a direct affect on the growth of a fish are:

  • Availability and quality of food.
  • Water chemistry.
  • Water quality.
  • Genetics.
  • Temperature.

start trading binary options Most fish grow fastest when they are very young and if their growth is stunted at this stage they may never catch up and reach their full potential regardless of the care they receive in later life. On the other hand if a fish is kept under ideal conditions then provided that it’s own genetic make up allows it the fish will grow and keep on growing until it eventually out grows its tank and at this stage it will need rehousing before its health suffers.

do fish grow to their tank size

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الخيارات الثنائية لا إيداع مكافأة ديسمبر 2017 Food obviously has a major effect on the growth of a fish. We are often told about the dangers of over feeding and how little food fish actually require but this can be taken to far and today many fish are under fed which results in stunting. Most flake food is high quality and offers a reasonably well balanced diet with most of the essential vitamins and minerals which fish require but fish which are fed a diet of dried food alone are unlikely to reach their full potential. For maximum growth suitable fresh food in the form of fresh greens, frozen food such as lance fish, silversides, invertebrates such as cyclops, blood worms, brine shrimps and so on should be used to supplement their diet  in the right quantity and with the right regularity. The right regularity might mean five or six meals per day for very small fry or at the other extreme just a couple of meals per week for a large carnivore.
Just to recap

  • Use the right diet for the fish being kept without relying completely on dried processed food.
  • Feed the fish with the proper amount of food to maintain growth without fouling the water with uneaten food.
  • Provide the food with the proper regularity, some fish need to graze constantly while others only need a large meal every two or three days.

binära optioner blogg Finally some fish need a specialised diet and they won’t thrive without it even if they seem willing to eat substitute food, this is something well worth checking when purchasing a fish which you aren’t familiar with.Moorish Idols for example may eat various food offered to them but they are very unlikely to thrive long term in captivity due to their special dietary needs.

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binäre optionen testen ohne anmeldung This is a difficult area to get right. There is quite a bit of misunderstanding about what is required and  this has given rise to more than the odd myth. Fish are stressed by change more so if that change is made quickly. In the old days of fish keeping it was more simple because the majority of fish were wild caught and people were aware of the water chemistry a particular species required and so that is what was provided. Today the majority of fish are captive bred often in water which is very different to the water of their ancestors. It has been shown that hatchery bred salmon can evolve to hatchery conditions in just a single generation that the dentition of some Mbuna can change in a single generation. This means that over many generations captive bred fish are more likely to feel at home in ‘tap water’ rather than the more extreme conditions found where they originate from. But wild caught fish of the same species will still require conditions which are found in the wild. In short you have to know the source of your fish and keep them appropriately.
It is this variation in care for essentially the same species which has  given rise to myth number one which says keep the fish in the same water as the shop where you bought the fish. This is wrong. A shop in a hard water area might stock wild discus and if these were purchased by someone who followed this advice the fish would almost certainly fail to thrive. Wild caught discus need very soft acidic water. Wild discus are found in water with a pH below 5, if a modern variety of tank bred discus was placed in such water it would be extremely distressed. Although there are exceptions tank bred fish are normally quite content with water where extremes are avoided. Wild caught fish on the other hand require water chemistry very similar to their natural environment. Fortunately wild caught fish tend to be well labelled in order to be sold at a premium. Getting the chemistry of the water wrong will stress the fish and stressed fish don’t grow very well.

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When fish are kept in a confined space their water changes over time. Nitrates rise and keep rising,  carbonates fall due to the biological processes going on within the tank, pH may fall and their will be a build up of organic compounds and possibly growth inhibiting pheromones. All this is happening in every tank and pond all the time and this is why partial water changes are essential. Water changes dilute the nitrates and organics and pheromones while at the same time replenish carbonates along with biologically important trace and minor elements. Water is natures own solvent but it can easily become saturated this means that as pollutants rise the oxygen level is likely to fall. Fish obviously do best in clean well oxygenated water and providing this is of paramount importance. Water quality has as much effect on fish growth as does diet. Young fry are particularly sensitive to this and in order to achieve maximum growth daily water changes will be required.
Some authorities recommend a partial water change of 25% every two weeks, this may or may not be sufficient, use the nitrate level to guide you, if the nitrate level is slowly rising week by week much above that of the source water then you need to increase either the volume or the frequency of partial water changes. Partial water changes are every bit as important as diet for the well being of fish.

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Pheromones are very similar in their action to hormones. The main difference being that pheromones are external and found in the environment while hormones are internal. It is generally accepted that fish secrete pheromones which stunt growth when they reach a high enough level. In a small crowded aquarium this can happen quite quickly and if water changes are insufficient then growth will be stunted, this is easy to observe when raising a tank full of fry. Unless daily water changes are kept up the fry will be stunted. Having said all this, there has been little scientific research in this area.

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Like people some fish will always be smaller than some others fish of the same species. There is nothing that can be done to make a genetically small fish in to a large fish.

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Fish tend to grow fastest in warmer conditions but there is an optimum temperature and anything over that will impede growth. The optimum temperature varies from species to species but this is usually easy to find out with a little research.

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Given a good diet, clean water of the right sort and with good tank maintenance almost all fish will show rapid growth and will keep on growing through out their life regardless of the size of tank in which they are kept. However it is recognised that it is far more difficult to maintain these ideal conditions in a small space than in a larger space simply because water quality will deteriorate more quickly when heavily stocked with fish. But in short TANK SIZE in itself DOES NOT AFFECT THE GROWTH OF A FISH.

About Andy Rapson

I've been interested in fish for about fifty years and I have kept many different species in that time. I have also worked in the fish trade running my own fish shop and I'm a Fishbase collaborator. I'm now mainly interested in fish husbandry, fish health, native marines and fish photography.

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