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Spawn (biology)
 
 
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Spawning is the production or depositing of large quantities of egg
Egg (biology)

In most birds and reptiles, an egg is the zygote, resulting from fertilization of the ovum. To enable incubation the egg is usually kept within a favourable temperature range as it nourishes and protects the growing embryo....
s in water. The process is done by marine animal
Animal

Animals are a major group of multicellular, eukaryotic organisms of the Kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life....
s such as amphibians and fish
Fish

A fish is any marine biology vertebrate animal that is typically ectothermic , covered with scale , and equipped with two sets of paired fins and several unpaired fins....
.


gg sac or collection can be called a 'redd' as in 'salmon redd' for the eggs attached to the stream bottom
Stream bed

A stream bed is the channel bottom of a stream, river or creek; the physical confine of the normal water flow. The lateral confines or channel margins, during all but flood stage, are known as the stream banks or river banks....
.






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Frogspawn Closeup
Spawning is the production or depositing of large quantities of egg
Egg (biology)

In most birds and reptiles, an egg is the zygote, resulting from fertilization of the ovum. To enable incubation the egg is usually kept within a favourable temperature range as it nourishes and protects the growing embryo....
s in water. The process is done by marine animal
Animal

Animals are a major group of multicellular, eukaryotic organisms of the Kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life....
s such as amphibians and fish
Fish

A fish is any marine biology vertebrate animal that is typically ectothermic , covered with scale , and equipped with two sets of paired fins and several unpaired fins....
.

Types of egg-layers

  • egg scatterers
  • nest builders
  • egg hangers
  • mouth breeders
  • egg buriers
  • egg enlargement


Spawn cycle


Egg

An egg sac or collection can be called a 'redd' as in 'salmon redd' for the eggs attached to the stream bottom
Stream bed

A stream bed is the channel bottom of a stream, river or creek; the physical confine of the normal water flow. The lateral confines or channel margins, during all but flood stage, are known as the stream banks or river banks....
. Specifically, a salmon redd is the space at the bottom of a stream that a spawning salmon makes for its eggs usually in a nest of rocks or scattered among the ground. Salmon eggs are typically a reddish, pink, or a yellow color.

Alevin

Salmonlarvakils
A newly-hatched fish
Fish

A fish is any marine biology vertebrate animal that is typically ectothermic , covered with scale , and equipped with two sets of paired fins and several unpaired fins....
 in the larva
Larva

A larva is a young form of animal with indirect developmental biology, going through or undergoing metamorphosis .The larva can look completely different from the adult form, for example, a caterpillar differs from a butterfly....
l stage, one which has not yet emerged from the nesting area. Alevins will have a noticeable yolk sac, and need this yolk sac while their digestive systems are developing. At this stage, the fish are not prepared to hunt live prey, and are completely dependent on the yolk sacs.

Salmon Newborn



Fry

Poecilia Reticulata Fry Dsc04357 Nevit
A fry is a recently-hatched fish, one which has fully absorbed its yolk sac and can now hunt and consume live food. The fry of live-bearers
Live-bearing aquarium fish

Live-bearing aquarium fish, often simply called livebearers, are fish that retain the eggs inside the body and give birth to live, free-swimming young....
 do not have a yolk sac and therefore need to begin feeding immediately after birth.




Parr

A parr is a juvenile fish, one preparing to leave the fresh water
Fresh Water

Fresh Water is the debut album by Australian rock and blues singer Alison McCallum, released in 1972. Rare for an Australian artist at the time, it came in a gatefold sleeve....
s of its home.

Smolt

A smolt is a juvenile fish. This is the stage where Salmonid becomes physiologically adapted to saltwater and begins its trek to its salt water
Seawater

Seawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5%, or 35 parts per thousand . This means that every 1 kg of seawater has approximately 35 grams of sea salt ....
 environment.

Grilse

A salmonid, especially an Atlantic salmon, which is returning to its spawning grounds after just one year in the sea.

See also

  • Anadromous
  • Reproduction
  • Stream pool
    Stream pool

    A stream pool, in hydrology, is a stretch of a river or stream in which the water depth is above average and the stream velocity is quite low. Such pools can be important for juvenile fish habitat, especially where many stream reaches attain high summer temperatures and very low flow dry season characteristics....