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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 larval period in oviparous fish is relatively short (usually only several weeks), and larvae rapidly grow and change appearance and structure (a process termed metamorphosis) to become juveniles. During this transition larvae must switch from their yolk sac to feeding on zooplankton prey, a process which depends on typically inadequate ...
Pregnant male seahorse. Male pregnancy is the incubation of one or more embryos or fetuses by organisms of the male sex in some species. Most species that reproduce by sexual reproduction are heterogamous—females producing larger gametes and males producing smaller gametes ().
Induced ovulation is able to occur in some fish species. In China freshwater fish including a variety of carp types, bream and loach are able to be induced to ovulate by using agonists of dopamine. This induction of ovulation from drugs is able to cause a predictable ovulation period and is very beneficial to farming of these species. [20]
These fish have both ovaries and testes and can produce both eggs and sperm at the same time. Others are sequential hermaphrodites. Others are sequential hermaphrodites. These fishes start life as one sex and undergo a genetically programmed sex change at some point during development.
The coelacanth — a giant weird fish still around from dinosaur times — can live for 100 years, a new study found. Females don’t hit sexual maturity until their late 50s, the study said ...
Diploidy can be restored by the doubling of the chromosomes without cell division before meiosis begins or after meiosis is completed. This is an endomitotic cycle. Diploidy can also be restored by fusion of the first two blastomeres, or by fusion of the meiotic products. The chromosomes may not separate at one of the two anaphases ...
They noticed a decline in fecundability — a term that refers to the probability of getting pregnant within one menstrual cycle — in the late spring and an increase in the late fall.