alevin: |
yolk-sac fry of the salmon family |
anadromous: |
migrating up-river to breed |
brood stock: |
fish set aside for breeding purposes |
dead sock: |
narrow, sock-shaped, lower extension of the net of a fish cage |
degree-day: |
temperature in degrees C x duration in days |
exsanguination: |
bleeding so that a large proportion of the blood volume is lost |
eyed-embryo: |
an embryo that has reached the stage where the eye is pigmented |
fallowing: |
a resting period, for ponds or cages, without fish |
fingerling: |
fish of about finger length, i.e. 10cm ± 5cm |
fish pump: |
a pump in which the impeller is designed to move fish and water without harm to the fish |
flexibacterium: |
a class of bacterium characterised by a non rigid appearance microscopically |
fry: |
that stage of fish development between alevin and fingerling |
grilse: |
a salmon that becomes sexually mature after one summer at sea |
MAFF: |
Ministry of Agriculture, Fisheries and Food |
milking: |
the stripping of milt from male fish |
milt: |
semen of male fish |
motility: |
the ability of, for example, spermatozoa to swim by lashing the tail |
parr: |
fingerling salmon distinguished by a series of darker patches, parr marks, on the flanks |
photoperiod: |
the period, or periods, of light during 24 hours |
phototactic: |
moving towards light |
priest: |
a small club |
raceway: |
long tanks, usually of concrete, through which water flows at a steady rate |
ROV: |
remotely operated vehicle |
sea cage: |
a fish cage robust enough to be used in the sea |
smolt: |
the final freshwater phase of the young salmon, silver in appearance and able to enter sea water |
SOAEFD: |
Scottish Office Agriculture, Environment and Fisheries Department |
sporozoan: |
a single-celled microscopic animal that reproduces by spore formation |
stripping: |
the removal of eggs and milt from fish by massage |
stunning: |
a process which causes immediate loss of consciousness in an animal |
triploid: |
an animal with three sets of chromosomes instead of the usual two sets |
water hardening: |
in the presence of water fertilised eggs stabilise and become turgid |
well-boat: |
a boat with part of the hold perforated to allow water to flow in or out |