Fish reproduction

Typical egg of a bony fish (Osteichthyes), about 1 mm in diameter. Fish eggs are often released into the water column, where they drift as zooplankton

Salmon eggs in different stages of development. In some only a few cells grow on top of the yolk, in the lower right the blood vessels surround the yolk and in the upper left the black eyes are visible.Diagram of a fish egg: A. vitelline membrane B. chorion C. yolk D. oil globule E. perivitelline space F. embryo

Fish reproductive organs include testes and ovaries. In most species, gonads are paired organs of similar size, which can be partially or totally fused. There may also be a range of secondary organs that increase reproductive fitness. The genital papilla is a small, fleshy tube behind the anus in some fishes, from which the sperm or eggs are released; the sex of a fish often can be determined by the shape of its papilla.

单词	Fish reproduction
释义	Fish reproduction 原声例句 TED-Ed（视频版） Meanwhile, any decline in fish reproduction is shared by the entire village. 同时，鱼类繁殖的任何下降都会由整个村庄分担。英语百科 Fish reproduction Fish reproductive organs include testes and ovaries. In most species, gonads are paired organs of similar size, which can be partially or totally fused. There may also be a range of secondary organs that increase reproductive fitness. The genital papilla is a small, fleshy tube behind the anus in some fishes, from which the sperm or eggs are released; the sex of a fish often can be determined by the shape of its papilla.
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