The growth of brown trout Salmo trutta L. in northern Scottish lochs with special reference to the improvement of fisheries

Campbell, R. N.

doi:10.1111/j.1095-8649.1971.tb05902.x

Cited by 43 publications

(54 citation statements)

References 16 publications

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“…In Norway, brown trout (Salmo trutta) is the most important species both for recreational and commercial fisheries, although brown trout frequently form dense populations consisting of small individuals with stunted growth and of minor value for fishery (Sømme, 1941;Campbell, 1971;Jensen, 1977;Aas, 1995). High fish densities and low food rations strongly influence individual growth rates in salmonids (Elliott, 1975(Elliott, , 1976Amundsen, 1989).…”

Section: Introductionmentioning

confidence: 98%

The brown trout (Salmo trutta) in the lake, Øvre Heimdalsvatn: long-term changes in population dynamics due to exploitation and the invasive species, European minnow (Phoxinus phoxinus)

2010

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Section: Introductionmentioning

confidence: 98%

The brown trout (Salmo trutta) in the lake, Øvre Heimdalsvatn: long-term changes in population dynamics due to exploitation and the invasive species, European minnow (Phoxinus phoxinus)

2010

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“…Ainsi le taux de croissance apparaît moyen comparé au barème conventionnel donné par CUINAT (1971) pour50 rivières françaises. Par contre, il apparaît supérieur à celui observé sur des rivières de même teneur en calcium situées en France (CUINAT, 1971 ;NEVEU et ECHAUBARD, 1975) ou à l'étranger (Ecosse : EGGLISHAW, 1967;CAMPBELL. 1971 ;Irlande : KENNEDY et FITZMAURICE, 1971 ;Pays de Galles: MILNER et al, 1978).…”

Section: Introductionunclassified

La croissance de la truite commune (Salmo trutta L.) sur le bassin de Scorff

Baglinière

Maisse

1990

Bull. Fr. Piscic.

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RÉSUMÉLa croissance de la truite commune (Salmo trutta L.) a été étudiée à partir du suivi de cfnq cohortes âgées de 0-à 2-ans dans quatre milieux différents (Scorff aval et amont, affluent, sous-affluent).D'une manière générale, la taille des truites quel que soit leur âge diminue de l'aval vers l'amont du Scorff et de la rivière à l'affluent et au sous-affluent. Le taux mensuel de croissance G = 2,85 (LnL2 -LnL1)/(T2 -T1) diminue de la première à la troisième année de vie quel que soit l'ordre de drainage. Ce taux de croissance varie suivant le milieu pour les deux premières classes d'âge (0+ et 1 ^ ), cet effet milieu étant relié à la densité de population pour les individus 0+. Le taux de croissance varie également suivant les années mais uniquement chez les plus jeunes truites et cet effet année est relié principalement à la température de l'eau. Un modèle de Von Bertalanffy est proposé pour décrire la relation entre la taille (Lf) et la somme des températures moyennes journalières depuis la date moyenne d'émergence (Tmj) pendant la première année:Les résultats sont discutés et permettent de dégager les faits majeurs intervenant sur la croissance de la truite tout au long d'un cycle jusqu'à la maturation sexuelle.Mots-clés : Température -Croissance -Truite commune -Rivière -France. THE GROWTH OF THE BROWN TROUT (SALMO TRUTTA L.) IN THE BASIN OF SCORFF RIVER SUMMARYThe growth of brown trout (Salmo trutta L.) has been studied with 0^ to 2» year old fish belonging to five cohorts, living in four différent environmental conditions (lower and upper part of River Scorff, a tributary and a subtributary of this river).Size of trout decreases in ail âge classes from the lower to the upper part of the main river, from the main river to the tributary and from the tributary to the subtributary. The monthly growth rate, expressed as G = 2.85 (LnL2 -LnL1)/(T2 -T1), decreases in each environmental condition from the first to the third year of life. Différences in the monthly growth rate according to différent environmental conditions could only be observed in the 0^ and 1-âge classes. For 0+ trout, this effect dépends on population density. In the younger trout population, growth rate changes also from one year to another, depending on the température of the water. The relation between length (Lf) and the sum of degree-days from the mean date of émergence (Tmj) is described for the first year of life. A good corrélation is found for an exponential model: Lf = 106.7 (1 -exp ]).Results are discussed and allow to draw some conclusions on the main factors influencing the growth of brown Trout up to the sexual maturation.

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“…Although the chemistry of Outer Hebridean waters varies considerably, the range of growth rate and life span of brown trout do not show any exceptional characteristics and are similar to those of mainland brown trout (Campbell 1971). Where the chemistry produces a eutrophic environment the growth rate is usually enhanced but population density is still the critical factor.…”

Section: Discussionmentioning

confidence: 97%

“…thick-lipped grey mullet (Crenimugil labrosus) and sand smelt {Atherina presbyter). Flounders may penetrate far into fresh waters, and at least 18 other species occur regularly, though seasonally (Campbell and Williamson 1979*).…”

Section: Brackish Lochsmentioning

confidence: 99%

The inland waters of the Outer Hebrides

Waterston¹,

Holden

Campbell

et al. 1979

Proc., Sect. B Biol. sci.

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SYNOPSISThe Outer Hebrides comprise approximately 1-3% of the land area but 15-8% of the area of standing waters of Great Britain. Streams there are generally small and only three are as large as fifth order. The majority of the lochs occur below 200 m altitude and are less than 25 ha in area. A total of 1375 stream systems enter the sea, and drain the land mass through 9240 stream segments. There are just over 6000 lochs, of which less than half are connected to these networks. Most of the water systems are on geologically base-poor rock or soil, and less than 3" ", situated on machair, are base-rich and eutrophic. The islands, due to their situation, receive precipitation in the form of very dilute sea water (with some non-marine sulphate probably derived from fossil fuel combustion) and this leads to unusual concentrations of chloride in the inland waters. Metamorphic rocks are resistant to weathering, so there is usually little variation in the composition of fresh waters except in the machair areas, where calcareous sands affect calcium concentrations and alkalinities.The flora and fauna reflect the aqueous conditions and there are some unique successions of species from high to low salinities even in the same water body. The lochs provide a wide range of habitats for aquatic vegetation, ranging from the rich machair lochs to the oligotrophic peaty lochs (which show marked similarities with their counterparts on the mainland). Three broad categories can be delineated on the basis of their water quality and vegetation: brackish lochs with varying degrees of marine influence, calcareous machair lochs which may also be affected by sea connections, and the peaty lochans of low alkalinity. A few brackish water animals are sufficiently euryhaline to exist in the machair lochs, which are otherwise dominated by freshwater species. The occurrence of chloride in inland waters enables some crustaceans, e.g. Neomysis integer, Gammaru.s duebeni and Diaptomus wierzejskii to extend into what are poor freshwater habitats. The main constituents of the freshwater fauna are molluscs and arthropods, and a few species of euryhaline fishes, i.e. salmon, sea and brown trout, three-spined and ten-spined sticklebacks and eels. There are some populations of non-migratory charr. No amphibians are present.

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The growth of brown trout Salmo trutta L. in northern Scottish lochs with special reference to the improvement of fisheries

Cited by 43 publications

References 16 publications

The brown trout (Salmo trutta) in the lake, Øvre Heimdalsvatn: long-term changes in population dynamics due to exploitation and the invasive species, European minnow (Phoxinus phoxinus)

The brown trout (Salmo trutta) in the lake, Øvre Heimdalsvatn: long-term changes in population dynamics due to exploitation and the invasive species, European minnow (Phoxinus phoxinus)

La croissance de la truite commune (Salmo trutta L.) sur le bassin de Scorff

The inland waters of the Outer Hebrides

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