Scottish Fish Farm Production Survey 2022

Appendix 2

Glossary and Abbreviations

Active Fish farms in a production growing cycle which may contain stock or be fallow.

Broodstock Adult fish held until maturation for breeding purposes.

Cleaner fish Fish species that are used as biological control for parasites in the marine Atlantic salmon farming industry

Diploid Fish with the normal two sets of chromosomes.

ERM Enteric redmouth disease.

Eyed-ova/eggs Fish egg(s) at the stage of development when the heavily pigmented eyes of the embryo are sufficiently developed to be clearly visible.

Fallow Fish farm having no stock, but still part of a growing cycle.

Fingerling A term commonly applied to young stages of salmonid fish.

Fry The life stage of a young salmon from independence of the yolk sac as the primary source of nutrition to dispersal from the redd.

Grilse Salmon harvested between 1^st January and 31^st August after one winter at sea.

Intra-peritoneal Within the body cavity.

IPN Infectious pancreatic necrosis.

Larval stage Recently hatched fish which live off a yolk sac attached to their bodies.

Non-producing A site which is active, may be stocked with fish, but has not produced any fish for harvest during the specified year.

On-growing Farm producing fish for the table market.

Ova Eggs.

0-year fish Fish in their first year of life.

Parr Young salmon at stage from dispersal from redd to migration as a smolt.

Photoperiod Alteration of the daylight regime.

Pre-salmon Salmon harvested between 1^st September and 31^st December after one winter at sea.

Raceway Concrete or brick channels used for farming fish.

SAV Salmonid alphavirus.

S1/2 Salmon or sea trout smolting at approximately six months from hatch (usually by photoperiod and/or temperature manipulation).

S1 Salmon or sea trout smolting at approximately one year from hatch.

S11/2 Salmon or sea trout smolting at approximately 18 months from hatch.

Smolt Fully silvered juvenile salmon or sea trout ready to be transferred or to migrate to sea.

Stripped Collection of ova/milt from broodfish.

Triploid Triploid fish are sterile fish which have three sets of chromosomes, unlike fertile fish that have two sets of chromosomes (diploid).

Year 2 salmon Adult salmon harvested during their 2^nd year at sea.

Year class Fish hatched or put to sea in a given year.