Non-indigenous freshwater fishes in Flanders: status, trends and risk assessment
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1 Non-indigenous freshwater fishes in Flanders: status, trends and risk assessment Hugo Verreycken, Gerlinde Van Thuyne, laude Belpaire Science Facing Aliens 2nd Belgian conference on biological invasions Brussels 11 May 2009
2 Non-native freshwater fish Status Trends isk assessment
3 Status In literature: 47 alien species were reported to have been considered or attempted for introduction in Belgium (Louette et al., 2001) Since 1990 in public waters in Flanders: 18 non-native fish species of which 9 naturalised and 7 acclimatised (+ 2 only in local conditions) elatively high proportion of non-native species (> 35%) relative to the total number of freshwater fish species (Verreycken et al., 2007) Origin: Asia: 7 sp. North America: 6 sp. Eastern Europe: 3 sp. Africa: 2 sp. Date/period of introduction: < 1800: 3 sp : 5 sp : 1 sp. > 1950: 9 sp.
4 Photographs: ollin Verlinde
5 Latin name ommon name Origin Introduction Pathway(s) Status Acipenser baeri Siberian sturgeon AS 2001 AQ, O A Ameiurus nebulosus Brown bullhead NA 1871 AQ, O N Aspius aspius Asp EE 1984 AN N arassius auratus Goldfish AS 17th c. O A arassius gibelio Gibel carp AS or EE 17th c. UN N larias gariepinus African catfish AF 1980s AQ A* tenopharyngodon idella Grass carp AS 1967 B A yprinus carpio ommon carp EE 13th c. AQ N Hypophthalmichthys molitrix Silver carp AS 1975 B A Hypophthalmichthys nobilis Bighead caro AS 1975 B A Ictalurus punctatus hannel catfish NA 1884 AQ A Lepomis gibbosus Pumpkinseed NA 1885 O N Oncorhynchus mykiss ainbow trout NA 1884 AQ, AN A Oreochromis niloticus Nile tilapia AF 1990 AQ A* Pimephales promelas Fathead minnow NA 1984 AN N Pseudorasbora parva Topmouth gudgeon AS 1992 UN, AN N Sander lucioperca Pikeperch EE 1890 AN N Umbra pygmaea Eastern mudminnow NA 1920 O, AQ N Origin: AS = Asia, EE = Eastern Europe, AF = Africa, NA = North America Pathway: AQ = aquaculture, O = ornamental, AN = angling/bait fish, B = biological control, UN = unintentional Status: A = Acclimatized, N = Naturalized; A* = acclimatized in restricted areas
6 Occurrence of non-indigenous fishes in Flemish river basins LS US BP Dm Dn Di G Le Me Ne Ys N gibel carp W W W W 11 topmouth gudgeon W 11 pikeperch 11 common carp W W W 11 pumpkinseed W W 10 5 brown bullhead rainbow trout goldfish fathead minnow eastern mudminnow grass carp asp silver carp bighead carp 1 Siberian sturgeon 1 channel catfish 1 African catfish 1 Nile tilapia 1 Nb =very rare (<=2,0%), = rare (2,1-10,0 %), =common (10,1-25,0%), W=widespread (>25,0%) Lower Scheldt (LS), Upper Scheldt (US), Bruges Polders (BP), Demer (Dm), Dender (Dn), Dijle (Di), Ghent anals (G), Leie (Le), Meuse (Me), Nete (Ne) and Yser (Ys) Total number of basins where a species is present (N); Total number of species in a basin (Nb)
7 Distribution maps Pikeperch Gibel carp Topmouth gudgeon Eastern mudminnow Brown bullhead Pumpkinseed Fathead minnow
8 Non-native freshwater fish Status Trends isk assessment
9 Trends 487 site specific fish surveys (INBO) (two 5 y. periods) ( & ): trends in frequency of occurrence and in abundance Electrofishing, fyke nets or combination Statistics Logistic regression: changes in the frequency of occurrence Linear mixed model: changes in abundance Splus 6.2
10 487 site specific surveys
11 Frequency of occurrence during 487 site specific surveys gibel carp (25.2%) topmouth gudgeon (17.9%) common carp (15.6%) pumpkinseed (12.2%) pikeperch (8.6%) brown bullhead (4.4%) eastern mudminnow (3.9%) remaining species < 1% of the sites
12 Trends in frequency of occurrence Species Fathead minnow ainbow trout Eastern mudminnow Brown bullhead Pikeperch Pumpkinseed ommon carp Topmouth gudgeon Gibel carp Slope p.value
13 0.2 Trends in abundance Slope 0.1 Gibel carp: 16 (1-1) Eastern mudminnow: 9 (1-1) Brown bullhead: 5 (1-1) Pumpkinseed: 38 (1-1) Topmouth gudgeon: 45 (1-1) Pikeperch: 15 (1-1) Eas t ern Top B ro Gib wn el c mou bull arp th g mud h ead udg min eon now om P ik e perc mon h carp Pum p kins eed
14 Trends in frequency of occurrence Increase: topmouth gudgeon P. parva, gibel carp. gibelio and pikeperch S. lucioperca Decrease: bullhead A. nebulosus Trends in abundance Decrease:gibel carp and common carp. carpio Trends can be explained for some fishes hanged stocking policies Improved water quality
15 Species to be expected white-finned gudgeon omanogobio belingi => Netherlands, Germany vimba Vimba vimba => Netherlands round goby Neogobius melanostomus => Netherlands tubenose goby Proterorhinus semilunaris => Netherlands, Germany bighead goby Neogobius kessleri => Netherlands, Germany Amur sleeper Perccottus glenii => Danube
16 Non-native freshwater fish Status Trends isk assessment
17 isk Analysis Tools Freshwater Fish Invasiveness Scoring Kit (FISK) Harmonia system with ISEIA protocol
18 Fish Invasiveness Scoring Kit Fish Invasiveness Scoring Kit (FISK by opp et al., 2005) is an adaptation of the Weed isk Assessment by Pheloung et al (1999) A screening tool for freshwater fishes 49 questions in 8 categories (Domestication, limate and Distribution, Invasive elsewhere, Undesirable traits, Feeding guild, eproduction, Dispersal mechanisms, Persistence attributes) onfidence (certainty/uncertainty) ranking of the assessors lassifies nonnative species into low-, medium-, and high-risk categories
19 ISEIA-protocol & Harmonia system Harmonia system ( categorizes invasive alien species in alert, watch or black list based on (1) Invasive Species Environmental Impact Assessment (ISEIA) protocol and (2) the distribution range in Belgium
20 omparison FISK UK FISK Flanders Species ommon name FISK UK FISK FL Ameiurus melas Black bullhead Ameiurus nebulosus Brown bullhead Aspius aspius Asp arassius gibelio Gibel carp tenopharyngodon idella Grass carp yprinus carpio ommon carp NA 30 Hypophthalmichthys molitrix Silver carp Hypophthalmichthys nobilis Bighead carp Lepomis gibbosus Pumpkinseed Neogobius fluviatilis Monkey goby Neogobius gymnotrachelus acer goby Neogobius kessleri Bighead goby Neogobius melanostomus ound goby Oncorhynchus mykiss ainbow trout NA 9 Perccottus glenii Amur sleeper Pimephales promelas Fathead minnow Proterorhinus semilunaris Tubenose goby Pseudorasbora parva Topmouth gudgeon Sander lucioperca Pikeperch Umbra pygmaea Eastern mudminnow 24 9 Vimba vimba Vimba High risk >= 19 Invasive High risk > 6 Non-invasive 1 =< Medium risk =< 6 Low risk < 1 NA Not assessed FISK scores range from 11 to 54
21 FISK UK scores are consistently higher Trend similar Large differences between assessors (within UK & in Flanders), only two assessors per region
22 omparison FISK - ISEIA Species ommon name FISK UK FISK FL ISEIA arassius gibelio Gibel carp 36, A3 Neogobius melanostomus ound goby 29, A0 Pseudorasbora parva Topmouth gudgeon A2 Perccottus glenii Amur sleeper A0 Ameiurus nebulosus Brown bullhead B2 Sander lucioperca Pikeperch B3 Lepomis gibbosus Pumpkinseed 27, B2 Pimephales promelas Fathead minnow B1 Umbra pygmaea Eastern mudminnow Scores vary but main categories are more or less consistent Need to harmonise existing risk assessments Expert opinion remains important => need for more data on impact of non-native species LIST
23 onclusions 18 non-native fish species in Flanders of which 9 naturalised gibel carp & topmouth gudgeon most widespread and invasive two species expected to become invasive when introduced (Amur sleeper and round goby) need for risk assessment tools that are (1) simple, (2) objective and (3) effective
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