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Thread: Facebook fish groups.

  1. #11
    Senior Member Aquaman61's Avatar
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    Quote Originally Posted by Mugwump View Post
    ..those are likely not discus fry.....for good growth, the discus fry get daily big water changes.....some folks ,for whatever reason, extend the practice into adulthood...

    Hormones & Pheromones

    Fish give off hormones and pheromones which in a closed system such as an aquarium build up in the water. In a natural environment these would be diluted and/or washed away by the flow of a river or by rainfall in a pond. Some can affect growth. For example, Trudeau et al (2000) concluded that gamma aminobutyric acid (GABA) has been associated with inhibited growth in goldfish. Goldfish are not the only species to produce this, therefore it is reasonable to link GABA to reduced growth in other species.

    Matty (1985) also found that “many species of fish are capable of conditioning the surrounding water to produce an effect on other individuals. The chemical cues thus produced facilitate or inhibit growth …” (Matty, 1985, p202). Matty goes on to state that “the decrease in growth rate or stunting brought about by crowded conditions has been recognised for a long time” (Matty, 1985, p202).

    Fish breeders have demonstrated that large frequent water changes can aid good growth as these dilute and/or remove some of the growth inhibiting hormones such as somatostatin. Mark Brumell (PFK interview with Jeremy Gay, 2012) recommends an unlimited supply of fresh water for optimal growth in goldfish breeding.

    Dr Richmond Loh recently answered a question posed by a Practical Fishkeeping forum member, Skwishee, on behalf of INJAF, regarding fish ‘growing to the size of their tank’. Dr Loh stated that,

    “Growth in fish, like other organisms, are influenced by many factors including nutrition and hormonal influences … Goldfish are one that produce growth inhibitory hormones (e.g. somatostatin) and in nature, it’s their way of reducing intraspecific competition by suppressing growth of other goldfish. This is a particularly useful survival mechanism especially if you’re a “big fish in a small pond”! In a tank situation, and if partial water changes are not performed regularly, this hormone can build up and suppress the goldfish itself!” (Loh, 2012).
    The process described above by Dr Loh is intended to help the fish suppress the competition, in a closed environment the fish can end up suppressing itself which has a significant impact on its growth.

    Are you talking about the pictures?

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