Development
Fertile lemon tetra eggs take approximately 72 hours to hatch at 28°C. The fry spend a further 24 to 48 hours absorbing the yolk sac, whereupon they become free-swimming. At this stage, the fry should be fed with infusoria or a special egglayer fry food, and frequent partial water changes (around 10% of the aquarium volume every 24 to 48 hours) initiated. After 7 days, the fry should be ready to feed upon newly hatched Brine Shrimp. The fry appear to be almost transparent at first, with the exception of the eyes, and do not begin to develop the 'lozenge' shape of the adult body until the differentiation of the finfold into the unpaired fins is complete (around 4–6 weeks). Once this process is complete, the fishes are ready to take sifted Daphnia. Maintenance temperature for the fry should be carefully and slowly reduced to around 25°C once the fishes are thus recognisably miniature versions of the adults. The first signs of black colouration on the unpaired fins may take a further two weeks of more to being manifesting themselves, and it will not be until the fishes are at least 12 weeks old that they will fully represent miniature versions of the parents. Even at this stage, the black colouration of the unpaired fins will be incompletely developed, and it will not be until sexual maturity is achieved (approximately 8 to 9 months after hatching) that the black border on the anal fin will become a reliable gender differentiation characteristic.
Read more about this topic: Lemon Tetra
Famous quotes containing the word development:
“They [women] can use their abilities to support each other, even as they develop more effective and appropriate ways of dealing with power.... Women do not need to diminish other women ... [they] need the power to advance their own development, but they do not “need” the power to limit the development of others.”
—Jean Baker Miller (20th century)
“The experience of a sense of guilt for wrong-doing is necessary for the development of self-control. The guilt feelings will later serve as a warning signal which the child can produce himself when an impulse to repeat the naughty act comes over him. When the child can produce his on warning signals, independent of the actual presence of the adult, he is on the way to developing a conscience.”
—Selma H. Fraiberg (20th century)
“I have an intense personal interest in making the use of American capital in the development of China an instrument for the promotion of the welfare of China, and an increase in her material prosperity without entanglements or creating embarrassment affecting the growth of her independent political power, and the preservation of her territorial integrity.”
—William Howard Taft (1857–1930)