Results for “larvae”

larvae

Plural of larva.

Used in 600 profiles

yolk sac larva

Post-hatching larval stage occurring in many fish species whereby the yolk sac remains attached to the ventral surface for a period. The larva does not feed normally until the yolk is fully-absorbed.

larval

Of, relating to, or being a larva.

Used in 47 profiles

larva

Immature free-living juvenile form of an organism that undergoes metamorphosis before assuming the adult form.

bloodworm

The freshwater larvae of certain midges which appear bright red due to their high haemoglobin content. Some species of the non-biting Chironomidae family are produced commerically for fish food with the larvae frozen or freeze-dried.

Used in 1,068 profiles

chironomid

Any member of the Chironomidae, a family of nonbiting midges with larvae normally found in freshwater. The larvae of some species are produced commercially for fish food and commonly referred to as 'bloodworm'.

Used in 342 profiles

yolk sac

A membranous sac containing yolk attached to the ventral surface of embryos and early larvae in some fishes. Retained for a period post-hatching in those species which form yolk sac larvae.

Used in 221 profiles

cyst

In biology, a small sac forming a capsule within which certain organisms remain during the larval or dormant stage.

Used in 2 profiles

incipient

Beginning to appear or develop, e.g., emergence of anatomical structures during a larval stage.

insectivore

An organism feeding only or mostly on insects and their larvae.

Used in 4 profiles

nauplius

First larval stage in certain crustaceans, comprising an unsegmented body with three pairs of appendages. Important constituent of plankton and the diet of some fishes.

oil globule

Small, spherical droplet of oil found within the yolk sac of fish larvae. There may be one or more present and the size, positioning, and colour are also variable meaning they can be useful in terms of taxon identification.

paedomorphism

Phylogenetic state in which juvenile or larval characters are retained in and throughout the adult stage. May arise via neoteny or progenesis.

pelagic phase

Period of time during the life cycle spent floating freely in the water column, usually as a larval constituent of plankton. Relatively common in marine fishes but also typical of amphidromous and diadromous species.

peritoneum

Membranous sac lining the abdominal cavity, the pigmentation of which is sometimes used in identification of fish larvae.

plankton

Any organism, or more typically, collection of organisms drifting freely in a body of water. Used in reference to both microscopic, e.g. algae, fish larvae, and larger, e.g. jellyfish, organisms.

Used in 15 profiles

yolk sac viviparity

Form of livebearing in which the larvae are mostly nourished by a yolk sac which is fully-absorbed prior to birth.

zoea

Early, planktonic larval form common in decapod crustaceans, e.g., crabs, characterised by possession of well-developed abdominal appendages and one or more spines on the carapace.

zooplankton

Plankton or planktonic constituent composed of small animals such as crustaceans and larval fishes.

Used in 318 profiles