Gymnocephalus cernua (Linnaeus, 1758)

Ruffe
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Gymnocephalus cernua   AquaMaps   Data sources: GBIF OBIS
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Gymnocephalus cernua
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Classification / Names Κοινά ονόματα | Συνώνυμα | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Ακτινοπτερύγιοι > Perciformes (Perch-likes) > Percidae (Perches) > Percinae
Etymology: Gymnocephalus: Greek, gymnos = naked + Greek, kephale = head (Ref. 45335).  More on author: Linnaeus.

Environment: milieu / climate zone / depth range / distribution range Οικολογία

; Γλυκού νερού; Υφάλμυρο βενθικό(ς); pH range: 7.0 - 7.5; dH range: 8 - 12; ποταμόδρομος (Ref. 51243); εύρος βάθους 10 - ? m (Ref. 9696).   Temperate; 10°C - 20°C (Ref. 13371); 74°N - 43°N, 6°W - 169°E

Κατανομή Χώρες | Περιοχές FAO | Οικοσυστήματα | Παρουσίες | Point map | Εισαγωγές | Faunafri

Europe: Caspian, Black, Baltic and North Sea basins; Great Britain; north to about 69° N in Scandinavia. Asia: Aral Sea basin, Arctic Ocean basin eastward to Kolyma drainage. Several countries report adverse ecological impact after introduction.

Length at first maturity / Μέγεθος / Βάρος / Age

Maturity: Lm 10.5  range ? - ? cm
Max length : 25.0 cm TL αρσενικό/απροσδιόριστο; (Ref. 556); common length : 12.0 cm TL αρσενικό/απροσδιόριστο; (Ref. 556); μεγ. δημοσιευμένο βάρος: 400.00 g (Ref. 556); μεγ. αναφερόμενη ηλικία: 10 έτη (Ref. 59043)

Short description Μορφολογία | Μορφομετρία

Ραχιαίες άκανθες (συνολικά): 11 - 19; Μαλακές ραχιαίες ακτίνες (συνολικά): 11-16; Εδρικές άκανθες 2; Μαλακές εδρικές ακτίνες: 5 - 6; Σπόνδυλοι: 35 - 36. Distinguished uniquely from its congeners by its body depth 24-27% SL. Differs further from other members of the genus by the combination of having a flank yellowish with numerous, small, irregular, dark blotches and having 11-16 dorsal spines (Ref. 59043). Caudal fin with 16 to 17 rays (Ref. 40476). Dorsal fins are fused. Color brownish with dark spots (Ref. 35388).

Βιολογία     Γλωσσάρι (π.χ. epibenthic)

Inhabits eutrophic lakes, lowland and piedmont rivers. Most abundant in estuaries of large rivers, brackish lakes with salinities up to 10-12 ppt and reservoirs. In general, its abundance increases with increased eutrophication (Ref. 59043). Reported to prefer still or slow-flowing water with soft bottom and without vegetation (Ref. 59043) and deep water with deposits of sand and gravel (Ref. 9696). Can tolerate some degradation of the environment (Ref. 30578). Can co-exist in deep lakes with Perca fluviatilis. Both species partly occur at different depths with Gymnocephalus cernua being more abundant in deeper layers (Ref. 59043). The membranous external walls of the head canals of this species provide high directional sensitivity; can feed at night in the dark using the lateral line system; feeds on zooplankton, chironomids, oligochaetes and amphipods (Ref. 10999). Pelagic in coastal lakes and tidal estuaries, preying on zooplankton and fish. Spawns on a variety of substrates at depths of about 3 m or less (Ref. 59043). White to yellow eggs in sticky strands are found on rocks and weed in shallow water (Ref. 41678). Used as bait for pike (Ref. 6258). Females live up to 10 year while males up to 7 years (Ref. 59043).

Life cycle and mating behavior Γεννητική Ωρίμανση | Αναπαραγωγή | Γεννοβολία | Αβγά | Γονιμότητα | Προνύμφες

Eggs turn adhesive on contact with water and stick to stones or plants. Females lay eggs in two or more portions, usually separated by about 30 days in summer. First portion of eggs is larger the second portion. Larvae without or with only a brief, pelagic larval stage, switching early to benthic life, secretive and solitary, not forming schools. Larval survival is poor below 10°C and above 20°C (Ref. 59043).

Main reference Upload your references | Αναφορές | Συντονιστής | Συνεργάτες

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. 120744)

  Least Concern (LC) ; Date assessed: 01 January 2008

CITES (Ref. 115941)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Potential pest





Human uses

αλιεία: περιορισμένης εμπορικότητας; αλιεία αναψυχής: ναί; δόλωμα: usually

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Διαδικτυακές πηγές

Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5312   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00977 (0.00891 - 0.01071), b=2.99 (2.96 - 3.02), in cm Total Length, based on LWR estimates for this species (Ref. 93245).
Τροφικό Επίπεδο (Ref. 69278):  3.3   ±0.57 se; Based on food items.
Ελαστικότητα (Ref. 69278):  Μεσαίο(α), ελάχιστος χρόνος για διπλασιασμό πληθυσμού 1,4 - 4,4 έτη (K=0.1-0.48; tm=1-2).
Vulnerability (Ref. 59153):  Low vulnerability (20 of 100) .
Price category (Ref. 80766):   Unknown.