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External fertilization is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. [1] It is contrasted with internal fertilization, in which sperm are introduced via insemination and then combine with an egg inside the body of a female organism.
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 ...
The spotted tilapia (Pelmatolapia mariae [2]), also known as the spotted mangrove cichlid or black mangrove cichlid, is a species of fish of the cichlid family. [3] It is native to fresh and brackish water in West and Central Africa , [ 3 ] but has been introduced to other regions where it is considered invasive .
The spawn (eggs) of a clownfish.The black spots are the developing eyes. Spawn is the eggs and sperm released or deposited into water by aquatic animals.As a verb, to spawn refers to the process of freely releasing eggs and sperm into a body of water (fresh or marine); the physical act is known as spawning.
Synodontis multipunctatus, also known as the cuckoo catfish, combines mouthbrooding with the behavior of a brood parasite: it eats the host mouthbrooder's eggs, while spawning and simultaneously laying and fertilizing its own eggs. The mouthbrooder (typically a cichlid) incubates the cuckoo catfish young, the catfish eggs hatch earlier than the ...
Females produce around 320–550 eggs, averaging around 2.5–4.5 cm in diameter. The bowers built by males are complex structures, with a raised central shallow saucer about 13–25 cm in diameter with a rim around 2 cm high, surrounded by 6–12 small pits, all contained within a larger pit, 30–90 cm in diameter, with a raised perimeter wall.
The mango tilapia (Sarotherodon galilaeus) is a species of fish from the cichlid family that is native to fresh and brackish waters in Africa and the Levant. [2] Other common names include Galilaea tilapia , Galilean comb , Galilee St. Peter's fish , and St. Peter's fish . [ 3 ] (
The native Mozambique tilapia is laterally compressed, and has a deep body with long dorsal fins, the front part of which have spines. Native coloration is a dull greenish or yellowish, and weak banding may be seen. Adults reach up to 39 cm (15 in) in standard length and up to 1.1 kg (2.4 lb). [4]