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Salmo marmoratus : fisheries, aquaculture, gamefish
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Salmo marmoratus
Picture by
Dresler, B.
Teleostei (teleosts) >
Salmoniformes
(Salmons) >
Salmonidae
(Salmonids) > Salmoninae
Etymology:
Salmo:
Latin, salmo, Plinius = salmon (Ref.
45335
)
.
More on author:
Cuvier
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; demersal; anadromous (Ref.
51243
). Subtropical; 2°C - 15°C (Ref.
11241
); 47°N - 43°N, 7°E - 20°E
Europe: Adriatic basin from Po (only northern tributaries) to Soca and Rizana drainages (Italy, Slovenia). Introduced in Tevere drainage in Italy. Molecular data suggest that populations identified as
Salmo marmoratus
from Neretva drainage (Bosnia-Herzegovina, Croatia) and most likely those from Lake Skadar basin and Drin to Shkumbin drainages (Montenegro, Albania, Kosovoa, Macedonia) represent another species, as yet unidentified. Records from Croatia, Montenegro, Bosnia and Albania may be other subspecies of Adriatic trout and not of this marble trout (Lucijan Rejec, lrejec@ribiska-druzina-tolmin.si, pers.comm. 07/09).
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 120 cm SL male/unsexed; (Ref.
59043
); max. published weight: 50.0 kg (Ref.
59043
); max. reported age: 10 years (Ref.
59043
)
Short description
Morphology
|
Morphometrics
Distinguished from all congeners in Adriatic basin by having the following unique characters: body silvery to olive-green with irregular brown lines forming a marbled pattern; and no parr marks in individuals larger than 6 cm SL. Differs further by the combination of the following characters: red spots confined to lateral line, absent in some individuals and populations; opercle with brownish blotches or lines; head length 22-25% SL; eye diameter 1.7-2.2 times in interorbital distance, 3.1-4.3 times in postorbital length (at 25-35 cm SL) (Ref.
59043
).
Inhabits cold streams and rivers in montane and piedmont landscapes with temperature usually not rising above 15° C during summer (Ref.
59043
). Occurs over sandy and gravelly bottoms of running or standing clean and cold waters in the upper courses of Alpine rivers and glacial lakes (Ref.
12291
). Feeds on a wide variety of aquatic and terrestrial invertebrates, shifting to fish diet when adult. Spawns in gravel of rivers and streams with swift water (0.4-0.5 m/s) at moderate depth (0.6-0.8 m). Lives up to at least 10 years. Threatened due to hybridization with introduced
Salmo trutta
and
Salmo cenerinus
, pollution, overfishing and river regulation. Only a few pure populations remain and stocking of pure strains has improved the situation. Conservation status is under least concern category, but might return to a threatened category if conservation measures end (Ref.
59043
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Does not undertake spawning migrations or undertake migrations only at very short distances. Individuals foraging in lakes move to lake tributaries to spawn. Males begin occupying spawning grounds about one week before females. Eggs hatch in about 45 days. Alevins commence feeding 59-63 days after spawning at 10° C (Ref.
59043
).
Kottelat, M. and J. Freyhof
, 2007. Handbook of European freshwater fishes. Publications Kottelat, Cornol and Freyhof, Berlin. 646 pp. (Ref.
59043
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
31 January 2006
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
Fisheries: commercial; aquaculture: commercial; gamefish: yes
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Estimates based on models
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01047 (0.00488 - 0.02245), b=3.03 (2.86 - 3.20), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 4.0 ±0.63 se; based on food items.
Resilience (Ref.
120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153
): Very high vulnerability (88 of 100).
Price category (Ref.
80766
):
Very high
.
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- 20 July 2016
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