-Cherax quadricarinatus (von Martens) (Decapoda: Astacidea: Parastacidae) is commercially exploited and has been intentionally introduced to various tropical and subtropical countries. Once established in the wild, it frequently becomes invasive. In Indonesia, this crayfish is native only to the southern part of the Papua Province. Cherax quadricarinatus is produced in semi-intensive farms for food as well as for ornamental purposes on most of Indonesian territory. We present here the first record of this species from Java, where this crayfish has formed at least two established feral populations. In total, eight subadult and adult crayfish of both sexes were captured in two natural lakes in the city of Bogor, West Java Province. Based on climate match, we suggest that C. quadricarinatus has high potential to become established within most of Indonesian territory. As a rapidly growing species with broad tolerance to varying environmental conditions, its spread is expected and it should be viewed as a possible threat to native decapod crustaceans. Detailed monitoring is therefore needed.Keywords: crayfish / biological invasion / redclaw / climate match / Parastacidae Résumé -Cherax quadricarinatus (von Martens) a envahi le territoire indonésien à l'ouest de la ligne de Wallace : preuves à Java. Cherax quadricarinatus (von Martens) (Décapode : Astacidé : Parastacidé) est exploitée commercialement et a été introduite intentionnellement dans divers pays tropicaux et subtropicaux. Une fois établie dans la nature, elle devient souvent invasive. En Indonésie, cette écrevisse est originaire seulement de la partie sud de la province de Papouasie. Cherax quadricarinatus est produite dans des exploitations semi-intensives pour la consommation, ainsi que pour des fins ornementales sur la plupart des territoires indonésiens. Nous présentons ici le premier signalement de cette espèce à Java, où cette écrevisse a formé au moins deux populations sauvages établies. Au total, huit subadultes et adultes d'écrevisses des deux sexes ont été capturés dans deux lacs naturels dans la ville de Bogor, province de Java Ouest. Basés sur les conditions climatiques, nous suggérons que C. quadricarinatus a un fort potentiel pour s'établir dans la plupart des territoires indonésiens. Comme c'est une espèce à croissance rapide avec une large tolérance aux conditions environnementales variables, sa propagation est attendue et elle doit être considérée comme une menace possible pour les crustacés décapodes indigènes. Une surveillance étroite est donc nécessaire.Mots clés : écrevisse / invasion biologique / écrevisse bleue / climat / Parastacidés
The international pet trade has caused numerous introductions of non-native species globally. This is also true for freshwater decapod crustaceans including the red cherry shrimp. This tiny creature has been previously found in thermally polluted waters in Europe (Germany and Poland). Here, we present its first occurrence in Hungary and in the entire Carpathian Basin. The species was sampled once per month over 1 yr, from November 2017 to November 2018 in a natural thermal pond (spa) and also in an adjoining non-thermal brook in Miskolctapolca, Hungary. Shrimps were preyed upon by adult fishes in the locality but many individuals, including ovigerous females and juveniles, were recorded within the survey continuously. The density of shrimps was positively correlated with the water temperature, despite some individuals being found in the non-thermal stream and also in winter. We consider that the population of this species in Hungary is now well-established and self-sustaining.
In 2017, a new non-indigenous crayfish species was found established in Europe. The captured individuals were identified as an orange morph of the Mexican dwarf crayfish
The pet trade in aquatic organisms is a significant source of non-indigenous species introductions. In comparison with ornamental animals, unintentionally transported invertebrate assemblages are easily overlooked by traders and keepers. Moreover, hitchhiking species detection and identification is difficult even for experts. The densities of “hitchhikers” in aquaria may be relatively higher than those in the wild. These phenomena are known in freshwater aquaria but poorly studied in marine ones. We found 17 species of non-ornamental marine invertebrates in one of the leading importers of aquarium species in the Czech Republic in November 2017. The set comprised six gastropods, two bivalves, three cnidarians, two echinoderms, two crustaceans, and two polychaete worms. In one case, a symbiont was also detected, associated with the host “hitchhiker”. No “live rocks” are traded by the surveyed wholesaler. Thus, the found animals were not imported together with this item as larvae or eggs. Contrary to the transport of targeted ornamental species, it is clear that transport of “hitchhikers” is occurring despite standard legislative regulations and should be brought to the attention of conservationists, wildlife managers, policymakers and other stakeholders.
Summary The question was whether a canyon‐shaped reservoir is inhabited by genetically distinct populations of European perch Perca fluviatilis exhibiting different spatial behaviour, or by a single population. The study was conducted in the spring of 2006 at Římov Reservoir, Czech Republic. Epipelagic and bathypelagic perch fry (EPF and BPF) were captured by trawl net (mesh size 1 × 1.35 mm) controlled by echo sounder, and littoral perch fry and adults (LPF and LPA) were caught by electrofishing and beach seine (mesh size 1 × 1.35 mm). DNA was isolated in 266 individuals from the reservoir, and phylogenetic analysis based on mtDNA was performed (n = 18) on BPF, EPF, LPF, and LPA from the reservoir and additional sequences from Central Europe. Six microsatellites were used for differentiating among communities (n = 266). There was no evidence for genetic divergence in mtDNA sequences. Analyses of microsatellites revealed no statistically significant variations between spatial communities, and confirmed genetic homogeneity among communities. FST values and the number of genetic clusters point to the same conclusion, i.e., the reservoir is inhabited by a single population whose individuals occupy different microhabitats.
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