Search results
Results from the WOW.Com Content Network
Marine fish can produce high numbers of eggs which are often released into the open water column. 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 ...
Pregnancy in fish. 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, e.g. [2][3][4][5] Consistent with this ...
Adult fish also prey on fish eggs and larvae. For example, haddock were observed satiating themselves with herring eggs back in 1922. [14] Another study found cod in a herring spawning area with 20,000 herring eggs in their stomachs, and concluded that they could prey on half of the total egg production. [17] Fish also cannibalise their own eggs.
Females are estimated to be carrying as many as 300 million eggs at one time, more than any other known vertebrate. [6] [43] Sunfish eggs are released into the water and externally fertilized by sperm. [30] Newly hatched sunfish larvae are only 2.5 mm (3 ⁄ 32 in) long and weigh less than one gram.
Caviar (also known as caviare, originally from the Persian: خاویار, romanized: khâvyâr, lit. 'egg-bearing') is a food consisting of salt-cured roe of the family Acipenseridae. Caviar is considered a delicacy and is eaten as a garnish or spread. [1] Traditionally, the term caviar refers only to roe from wild sturgeon in the Caspian Sea ...
The sticky eggs then attach to submerged vegetation, and development begins. Only a few days are needed for the eggs to hatch into larval fish, and another 10 days or so for the larval fish to detach from the vegetation, and start moving about as young fry. [28] Egg production is variable, and believed to be dependent on the size of the female.
The spawning fish select sandy or pebbly shallows and deposit their eggs primarily between sundown and midnight. Females release eggs in batches of about 30,000 eggs, though very large fish deposit an estimated as many as 156,000 eggs. Total annual egg production is 200,000–600,000 eggs per female, with larger fish producing more.
Mostly the eggs are left to their own devices; many squid lay sausage-like bunches of eggs in crevices or occasionally on the sea floor. Cuttlefish lay eggs separately in cases and attach them to coral or algal fronds. [65] Like Pacific salmon, cephalopods are mostly semelparous, spawning many small eggs in one batch and then dying. Cephalopods ...