The larva can look completely different from the adult form, for example, a caterpillar differs from a butterfly. Larvae often have special (larval) organs which do not occur in the adult form. The larvae of some species can become pubescent without actually developing into the adult form (for example, in some newts). This is called neoteny.
Therefore, larval response was dependent on the presence of at least one cis double bond in the molecule, conservation of molecular shape with increasing acyl chain length by addition of cis double bonds, and the presence of a free carboxyl group.
Larval settlement responses of Phragmatopoma lapidosa, a gregarious sabellariid from the tropical western Atlantic, were very similar to those of P. californica (Pawlik, 1988b).
Larval settlement experiments performed in laboratory flumes have several major advantages over those performed in still water; in particular, the ability of larvae to select substrata in flow can be assessed.
The larval ecology of reef fishes may be the key the elusive understanding of what is controlling the abundance and distribution of reef fish populations.
This high mortality of larval may have a major influence on adult population sizes of coral reef fishes (Doherty, 1983) as it may limit the supply of new recruits to a reef.
The ability of larval individuals to determine the local characteristics, including the availability of shelter, number of predators, and supply of food probably varies with species, as some are settling very immature while other are settling as fully developed juveniles.
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