Malte Dorow

• PhD
• Researcher at State Research Center of Agriculture and Fisheries Mecklenburg-Vorpommern

A 30 years long data series on the infection dynamics of European eel (Anguilla anguilla L.) with the non-native invasive nematode Anguillicola crassus Kuwahara, Niimi & Hagaki, 1974 is presented. Parasite burden was evaluated for 30 years in inland and coastal waters in Mecklenburg-Western Pomerania from 1991 to 2020. The total prevalence, mean in...

One possible reason for the European eel (Anguilla anguilla) population decline is the neozoan eel swim bladder nematode Anguillicola crassus. To investigate whether the prevalence of A. crassus and the associated swim bladder pathology is related to eel habitat, growth rate, and age, 728 yellow eels from 6 habitats differing in salinity and locate...

We synthesize a large body of literature involving peer-reviewed work, grey literature and novel data analyses about the small-scale northern pike (Esox lucius) fishery in lagoon ecosystems in the southern Baltic Sea. Based on our comprehensive review that synthesizes ecological as well as social, economic and governance-related literature we deriv...

Globally, successful invasions of non-indigenous species affect biodiversity and can push ecosystems beyond tipping points. This study aimed to identify factors that influence round goby (Neogobius melanostomus) abundances and distribution pathways along the eastern German coast of the Baltic Sea over a 12-year period. The study further explored ho...

Angler satisfaction is a key consideration in the management of recreational fisheries. Anglers typically prefer high catch rates and large fish, but the importance of these catch outcomes for satisfaction may differ across angler types, target species, and other contextual conditions. We examined the relationships between catch outcomes and satisf...

According to the recruitment indices provided by ICES for the years 2011–2021, the natural recruitment of the European eel remains at low level. However, fishery-dependent data series indicate an increasing trend in the southern Baltic Sea within recent years. In the light of the pan-European conservation efforts, the question is whether fishery-in...

Urban development along coastlines is accompanied by habitat fragmentation and loss of habitat connectivity, particularly affecting the habitat and nursery function of estuarine areas for migratory marine species. Constructed floating wetlands, deployed as ‘stepping stones’ along urban coastlines where natural wetlands are missing, offer the potent...

A robust assessment of the American eel (Anguilla rostrata) stock, required to guide conservation efforts, is challenged by the species' vast range, high variability in demographic parameters and data inadequacies. Novel ideas and underutilised resources that may assist both analytic assessments and spatially oriented modelling include (1) species...

The American eel (Anguilla rostrata) occupies a vast range in the West Atlantic Ocean and inflowing waters. Despite its presumed panmictic status, management of this species is geographically fragmented. There have been widespread calls for internationally coordinated efforts towards a range-wide stock assessment, but such an objective faces obstac...

Little is known about whether brackish coastal ecosystems attract specific angler types that are characterized by site‐specific preferences and behaviors while targeting freshwater fishes living in a low‐salinity environment. Using the lagoon (“Bodden”) fisheries in northeastern Germany, we compared the human dimensions among anglers fishing in Bod...

Within recent years, a slight but significant increase of European eel Anguilla anguilla (L.) recruitment has been documented, but it remains questionable whether or not the increased recruitment levels resulted in higher eel numbers at the regional scale. To detect the changes in yellow eel numbers, logbook data covering a 15‐year time series of c...

The topic of the poster deals with the bioaccumulation potential of the chemically marker Alizarin red S (ARS) in eel muscle tissue. In this study, on the one hand, a detection method was developed to determine ARS in fish tissues and, on the other hand, the ARS concentration in 250 eels was analyzed.

For fish stock management and large-scale stocking programs, the chemical substance alizarin red S (ARS) is an important tool to mark fish permanently. Equally, for the IUCN red list species European eel (Anguilla anguilla), ARS is proven to be the most promising option for mass marking. ARS binds to calcified structures (i.e., bones and otoliths)...

To monitor yellow eel densities in non-tidal coastal waters an enclosure approach was developed. With a boundary net a quadratic area of 1-ha is enclosed. To catch enclosed eels in each corner a fyke is installed and additionally fyke net chains are deployed. However, the unknown capture efficiency of the enclosure within the standard fishing time...

Migration patterns of 146 female silver eels on their way through fresh and brackish water stretches of the Warnow River into the Baltic Sea were studied using acoustic telemetry. The majority of eels (77%) regained their expected downstream migration behaviour after a median rehabilitation time of 2 days. Positive rheotactic behaviour was obse...

To assess yellow eel (Anguilla anguilla L.) densities in non‐tidal waters, 1‐ha enclosure approach was developed. For unbiased density and biomass calculations, the catchability of the system needs to be evaluated. A telemetry study with 49 tagged eels was conducted in 2015 and 2016 to verify the effectiveness of the 1.8‐m high boundary net. Exclud...

In einem kombinierten Hälter- und Teichversuch wurde untersucht, ob eine Zwischenhälterung bei 4 – 6 °C ohne Fütterung (Kalthälterung) oder eine Zwischenhälterung bei 12 – 14 °C mit Erhaltungsfütterung (Warmhälterung) einem sofortigen Besatz von Glasaalen in die Gewässer im Winter vorzuziehen ist. Dazu wurden Glasaale direkt bzw. nach einer entspre...

Several anguillid eel species have experienced severe population declines over the past decades, particularly the European eel (Anguilla anguilla), which is listed as critically endangered by the International Union for Conservation of Nature. To reduce fishing mortality, many European countries have introduced strict recreational eel fishing regul...

Infection with the swim bladder nematode Anguillicola crassus has been hypothesised to threaten the spawning migration success of the endangered European eel (Anguilla anguilla). To examine this assumption, we compared the swimming behaviour of one Anguillicola crassus infested eel in the North Sea and three parasite-free eels in the Baltic using d...

Estimations of age and growth of local eel stocks are important prerequisites to develop models describing stock dynamics in a river system and to subsequently establish and implement management plans requested by the EU to assist conservation of the European eel stock. Age determination of eels has been conducted by otoliths evaluation for more th...

In 2007, European eel regulation was implemented forcing EU member states to develop eel management plans to increase silver eel escapement. Several possible measures were listed in this regulation including the reduction of the fisheries-induced mortality. As a result, several countries introduced stricter eel angling regulations which increased t...

The state of knowledge on the science and management of freshwater recreational fisheries is reviewed, with the objective of integrating insights from disparate fields such as fisheries science, environmental complexity theory, common-pool-resource theory, and resilience theory. First, freshwater recreational fisheries are characterized as complex...

The European eel is an important commercial fishery species in the coastal waters of Mecklenburg-Vorpommern. To provide information on the historic trend as well as the current status of the coastal eel fisheries harvest data were gathered for the time period 1955 till 2015. In last 60 years the commercial eel landings decreased dramatically. In 19...

Commercial eel fishing in inland waters of Mecklenburg-Vorpommern has a long history. Till today the eel is one of the most important commercial targeted species in this region. In this chapter we provide detailed information on the eel harvest and eel stocking activities during the time period 1955 till 2015 in Mecklenburg-Vorpommern. During this...

In 2007 the European Union implemented the European eel action plan forcing EU member states to increase silver eel escapement. Beside other management actions eel stocking is one of the most important eel conservation measures in Germany. According to the current discussion on the net benefit of eel stocking compared to the natural dispersal of th...

Untersuchungsziel der vorliegenden Studie war die Frage, ob besetzte Aale aus dem Einzugsgebiet der Elbe sich bei der Abwanderung durch die Nordsee orientieren können und vergleichbare Abwanderungsrouten wie natürlich eingewanderte Aale nutzen. Dazu wurden im Herbst 2012 45 Blankaale aus der Unterhavel, die mit großer Wahrscheinlichkeit aus Besatz...

The poster deals with the dispersal of the round goby in the eastern german part of the southern Baltic.

Whenever satisfied anglers are an important objective of recreational fisheries management, understanding how trip outcomes influence satisfaction reports is critical. While anglers, generally, prefer high catch rates and large fish, the relative importance of these catch outcomes for catch satisfaction has not been established across species and a...

Beside habitat criteria the colonization of yellow eels (A. anguilla) in coastal waters might be also influenced by density driven mechanism. To obtain a better understanding of factors influencing the settlement of eels in coastal waters the density and the size distribution of yellow eels were analyzed along a 180 km transect in southern German B...

Beside habitat criteria the colonization of yellow eels (A. anguilla) in coastal waters might be also influenced by density driven mechanism. To obtain a better understanding of factors influencing the settlement of eels in coastal waters the density and the size distribution of yellow eels were analyzed along a 180 km transect in southern German B...

Recruitment of the European eel is in decline since three decades. So far, the reasons of the decline have not been fully understood. Beside other factors, infection with the exotic swimbladder parasite Anguillicoloides crassus has been discussed as a threat to the species. In the present study monitoring results for A. crassus in eels from North G...

In response to the detection of American eels in inland waters of the state Mecklenburg-Vorpommern, located in north-eastern Germany (Frankowski et al. 2009), a genetic monitoring program was established using the identification protocol of Frankowski & Bastrop (2010). The method allows the unambiguous species identification of A. anguilla and A. r...

To detect growth differences of European eel Anguilla anguilla along the southern German Baltic coast 728 yellow eels, with total lengths ranging from 256 to 944 mm and ages ranging from 3 to 15 years were collected from six coastal areas from 2005 to 2009. The estimation of the growth performance was based on the otolith increments. The mean growt...

In the light of the European wide efforts to increase the spawning biomass of the European eel, a reliable measurement of the escapement of mature silver eel is necessary to prove the effectiveness of the conservation management measures. The seaward migration of mature eel is commonly viewed as a seasonal phenomenon with concentrated migration pea...

While catch-and-release (C&R) is a well-known practice in several European freshwater recreational fisheries, studies on the magnitude and impact of this practice in European marine recreational fisheries are limited. To provide an overview of the practice and magnitude of C&R among marine recreational anglers in Europe, the existing knowledge of C...

Angling catch records are frequently used to reveal fish population developments. It is therefore important to understand the determinants of angling catches. This study focused on angler-related, biotic and abiotic factors influencing catchability of Eurasian perch, Perca fluviatilis L. A multi-lake (21 lakes) study based on angling diaries collec...

In response to the decline of the European eel (Anguilla anguilla), the European Union implemented an eel recovery action plan in 2007. Many anthropogenic and natural causes of the decline bring complexity to the issue of how to effectively conserve eel stocks. One stakeholder that has been identified is the recreational fishing sector, management...

In response to the dramatic decline of the European eel Anguilla anguilla population, the European Union member states developed eel conservation programs. To facilitate program development, a thorough understanding of eel angler perceptions about the degree of the current eel decline, their potential contribution, and their perceptions about the w...

Fisheries managers are looking for valid information on basic characteristics of recreational fisheries, such as landings and effort data, to inform management decisions. A complementary survey approach was designed to generate data on effort and harvest as well as various human dimensions of anglers using a telephone-diary-mail-survey design for a...

According to a single detection of A. rostrata in Mecklenburg-Vorpommern (Northeast Germany) a genetic screening monitoring program was implemented. In first step, a genetic identification protocol was developed which allows the distinction between A. rostrata and A. anguilla. Based on a 5 year monitoring program it was demonstrated that the A. ros...

Abstract  Recreational specialisation theory was coupled with a discrete choice experiment to understand eel, Anguilla anguilla L., angler’s heterogeneity in their reaction to regulatory changes and the associated welfare changes. Differently specialised eel anglers exhibited distinct preferences for catch variables and eel angling regulations. All...

A novel variation of a multivariate stated preference method (the maximum difference conjoint approach) is presented in a survey designed to elicit the preferences of a fisheries stakeholder group (recreational anglers fishing in northern Germany) for a portfolio of measures to conserve European eel (Anguilla anguilla L.). Unlike other survey metho...

Der europäische Aal (Anguilla anguilla) besitzt in vielen Staaten Europas einen hohen fischereilichen und soziokulturellen Wert (Ringuet et al. 2002). In den letzten Jahren sind die Aalbestände dramatisch zurückgegangen (Dekker 2008), so dass sich der europäische Aalbestand außerhalb sicherer biologischer Grenzen befindet (ICES 2008, Dekker 2008)....

Wie hinlänglich bekannt ist, geht die Aalpopulation (Anguilla anguilla) europaweit dramatisch zurück (Dekker 2008). Im Jahr 2007 wurde auf europäischer Ebene die EU-Aalverordnung verabschiedet (EC 2007). Sie fordert von den Mitgliedstaaten die Entwicklung von einzelstaatlichen Aalmanagementplänen zur Gewährleistung der Abwanderung von 40% des Blank...

Mit großen Interesse haben wir den Aufruf von Lasner (2009) gelesen, die Soziologie und andere gesellschaftswissenschaftliche Disziplinen verstärkt in die Binnenfischereiforschung zu integrieren. Dies spricht uns aus der Seele. Lasner (2009) impliziert, dass eine gesellschaftswissenschaftliche Auseinandersetzung mit der Binnenfischerei in Deutschla...

Der europäische Aal (Anguilla anguilla) ist in seiner Bestandsgröße europaweit stark zurückgegangen. Um die Aalpopulationen zu erhalten, verabschiedete die Europäische Union 2007 eine Verordnung zum Aalbestandschutz. Sie verpflichtete alle Mitgliedsstaaten, bis Ende 2008 Bewirtschaftungspläne zum Schutz des Aals zu erarbeiten und der Europäischen K...

Die Angelfischerei ist der wichtigste Nutzer von Süßwasserfischen in allen Industrienationen, so auch in Deutschland (Arlinghaus et al. 2002, Post et al. 2002, Arlinghaus 2004, Arlinghaus & Cooke 2005). Intensive Angelfischerei kann sich in einer Veränderung der Struktur und Funktion von Fischbeständen manifestieren und zu deren "unsichtbaren Niede...

Ausgehend vom Agrarbericht Mecklenburg-Vorpommerns (M-V) aus dem Jahr 2006 kann ein positiver Trend beim Verkauf von Angelkarten verzeichnet werden. So konnte im Binnenbereich im Vergleich zum Vorjahr der Verkauf von Jahresangelerlaubnisscheinen um 18 % gesteigert werden. Ebenso hat sich in den letzten zehn Jahren entgegen der allgemeinen Bevölkeru...