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Sea Trout Recognition

This document provides information about different life stages of sea trout: - Fresh run sea trout can be identified by their bright silver sides and loose scales. - Kelt are spent spawning trout encountered in spring that can be mistaken for fresh run trout. - Breeding males, called cocks, develop enlarged snouts and lower jaws while females, called hens, retain normal proportions. - Young sea trout that return to rivers in their first year after going to sea are called herling, finnock, whitling, peal, or sewin and typically average around half a pound.

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Jim Hendrick
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891 views1 page

Sea Trout Recognition

This document provides information about different life stages of sea trout: - Fresh run sea trout can be identified by their bright silver sides and loose scales. - Kelt are spent spawning trout encountered in spring that can be mistaken for fresh run trout. - Breeding males, called cocks, develop enlarged snouts and lower jaws while females, called hens, retain normal proportions. - Young sea trout that return to rivers in their first year after going to sea are called herling, finnock, whitling, peal, or sewin and typically average around half a pound.

Uploaded by

Jim Hendrick
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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SEA TROUT RECOGNITION

FRESH RUN SEA TROUT


Easily recognised by bright silver sides, white lower fins and loose,
easily detached scales. Some carry sea lice which drop-off in fresh
water within a few days. After 2 or 3 weeks they lose the silver and
appear like dull coloured brown trout, lacking true red spots.
Mature sea trout vary widely in size depending on marine growth
and longevity. Typically, at first spawning return they may be about
350-450 mm in body length and weigh around 0.5-1.5kg. Older
specimens, which may have spawned several times, can range to in
excess of 10kg, while maiden sea trout of this very large size can be
found in the southern North Sea and the Baltic Sea.

KELT
Encountered in Springtime, well-mended kelts are silvery and can
be mistaken for fresh run sea trout. They are normally slimmer in
shape and can often be distinguished by whitish-silver flanks which
lack the iridescent colours of fresh-run fish.

BREEDING COCK
Coloured male sea trout can be indistinguishable from male brown
trout which also spawn with sea trout hens. Males develop enlarged
snouts and an obvious kype on the lower jaw – females retain
normal head proportions at all life stages.

BREEDING HEN
Sea trout/brown trout breed in autumn when river temperatures
reach about 6 degrees, usually in October/November.
Most are coloured (illustrated) but late-running fish may still be
silver-sided.

HERLING, FINNOCK, WHITLING, PEAL, SEWIN ETC


These are young sea trout returning to their home rivers in the same year as their first migration. They
depart as smolts in April/May and return from July onwards typically averaging around a half pound or ten
inches long – those over 13 inches are usually mature one sea winter sea trout.
Unlike salmon grilse many of these small sea trout are sexually immature.
They should not be killed in excess – they are the large sea trout of the future.

LIFE HISTORY & CONSERVATION

The Eurasian Trout Salmo Trutta.L. comprises a great number of local races which over time have adapted
to particular habitats. Even small tributary streams can produce a variety of life options, some trout
remaining as freshwater residents, especially males, while others migrate to richer feeding grounds
downstream in rivers, lakes, estuaries - or to the open sea where they become silver sea trout.
Sea trout are sea-going brown trout – their young (below) are indistinguishable
The migratory tendency varies widely. Trout above impassable falls lose it almost completely while rivers
until those about to migrate to sea become silvery smolts (above). with good breeding habitat but limited feeding have a strong tendancy to produce sea trout.
Most British sea trout are females, their male partners often remaining behind in
the rivers as resident brown trout. Enhancement and conservation of sea trout is usually concentrated on three fronts –

Monitoring of trout at different life stages to determine their success and to educate the public and those
responsible for river management on enhancement.
Improving the freshwater habitat to increase the numbers of trout going to sea.
Using local trout for any stocking as these are most likely to be best adapted to local river and sea
conditions.

It is useful for fishermen to recognise that on sea trout rivers the resident brown trout, both large and
small, are likely to have genetic tendancies to migrate and become sea trout - and should be conserved
accordingly.

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