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A pregnant Southern platyfish. Pregnancy has been traditionally defined as the period of time eggs are incubated in the body after the egg-sperm union. [1] Although the term often refers to placental mammals, it has also been used in the titles of many international, peer-reviewed, scientific articles on fish.
The eggs have an average diameter of 1 millimetre (0.039 in). The eggs are generally surrounded by the extraembryonic membranes but do not develop a shell, hard or soft, around these membranes. Some fish have thick, leathery coats, especially if they must withstand physical force or desiccation. These type of eggs can also be very small and ...
Goldfish have a memory-span of at least three months and can distinguish between different shapes, colors, and sounds. [33] [34] By using positive reinforcement, goldfish can be trained to recognize and to react to light signals of different colors [35] or to perform tricks. [36] Fish respond to certain colors most evidently in relation to ...
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Goldfish can crowd out native fish and wildlife in a variety of ways. The biggest problem is like the old Dr. Seuss "one fish, two fish" as there numbers in the wild continue to proliforate ...
Common goldfish can be kept in water gardens or outdoor ponds throughout the year. Outdoor ponds have similar care requirements as indoor tanks, with some notable exceptions such as amount of sunlight, natural and artificial environment pollution (i.e. dead leaves, debris, runoff), algae, selection of pond mates (i.e. algae eaters, frogs
A boa constrictor in the U.K. gave birth to 14 babies — without a mate. The process is called parthenogenesis, from the Greek words for “virgin” and “birth.”
Fingerling – refers to a fish that has reached the stage where the fins can be extended and protective scales have covered the body. [4] At this stage, the fish is typically about the size of a human finger, [5] hence the name. Once reaching this stage, the fish can be considered a juvenile, and is usually active enough to move around a large ...