A5068153767- Fish Ecology and Management Studies
- Reproductive biology and impacts on aquatic species
- Marine and fisheries research
- Aquaculture Nutrition and Growth
- Toxic Organic Pollutants Impact
- Environmental Toxicology and Ecotoxicology
- Effects and risks of endocrine disrupting chemicals
- Fish Biology and Ecology Studies
- Physiological and biochemical adaptations
- Ichthyology and Marine Biology
- Marine animal studies overview
- Pesticide Exposure and Toxicity
- Fish biology, ecology, and behavior
- Aquaculture disease management and microbiota
- Myxozoan Parasites in Aquatic Species
- Semantic Web and Ontologies
- Mercury impact and mitigation studies
- Diffusion and Search Dynamics
- Identification and Quantification in Food
- Marine Ecology and Invasive Species
- Insect and Pesticide Research
- Meat and Animal Product Quality
- Scientific Computing and Data Management
- Retinal Development and Disorders
- Aquatic Invertebrate Ecology and Behavior
Johann Heinrich von Thünen-Institut
2012-2025
Institute of Fisheries and Aquaculture
2025
Hochschule Bremerhaven
2019-2023
Abstract Numbers of European glass eels ( Anguilla anguilla) monitored along the Atlantic and Mediterranean coasts Europe currently serve as main stock indicator in assessment this critically endangered species. Spawning, however, takes place exclusively Sargasso Sea, several thousand kilometers away. The beginning its complex lifecycle is characterized by a distant lengthy larval drift, before young-of-the-year reach monitoring stations at coasts. oceanic mechanisms regulating dispersal...
It has been known for about a century that European eels have unique life history includes offshore spawning in the Sargasso Sea 5000–7000 km away from their juvenile and adult habitats Europe northern Africa. Recently hatched eel larvae were historically collected during Danish, German American surveys specific areas southern Sea. During 31 day period of March April 2014, Danish research ships sampled along 15 alternating transects stations across The collection recently (≤12 mm) 70° W...
Abstract The roundscale spearfish ( Tetrapturus georgii ) is a poorly studied species with limited information available on its biology, ecology, and population status. Although the adult life stage of morphologically distinguishable from closely related such as overexploited white marlin Kajikia albida ), misidentification common, adding to uncertainties connected assessments these pelagic highly migratory species. genetic studies have recently confirmed distinction congeneric species, much...
Abstract Between 1971 and 1991, a series of ichthyoplankton surveys were conducted along the European continental slope to assess abundance late-stage eel larvae (Anguilla anguilla). The information from these provides valuable baseline for assessing situation prior during recruitment collapse as well comparisons with present-day status. resulting can supplement existing data, particularly in regions that are currently not sufficiently covered by glass time (e.g. eastern southern...
Abstract The abundance and distribution of leptocephalus larvae the European eel ( Anguilla anguilla, Anguillidae) were examined using ten historic recent Sargasso Sea expeditions that selected on basis having largest number sampling stations highest catches. surveys cover period 1920–2014. Station data recalculated to same unit larval density per area, irregular station positions transformed a regular spatial grid allow calculation comparable measures youngest (0+) cohort. result is mean...
Vertebrates use cone cells in the retina for color vision and rod to see dim light. Many deep-sea fishes have adapted their environment only retina, while both genes are still preserved genomes. As fish larvae start lives shallow, later submerge depth, they cope with diverse environmental conditions during ontogeny. Using a comparative transcriptomic approach 20 species from eight teleost orders, we report on developmental cone-to-rod switch. While adults mostly rely opsin (RH1) light,...
Chemical pollution is hypothesized to be one of the factors driving strong decline critically endangered European eel population. Specifically, impact contaminants on quality spawning eels and subsequent embryo survival development has been discussed as crucial investigation point. However, so far, only very limited information potential negative effects reproduction available. Through combination nontargeted ultrahigh-resolution mass spectrometry multidimensional gas chromatography,...
During their once-in-a-lifetime transoceanic spawning migration, anguillid eels do not feed, instead rely on energy stores to fuel the demands of locomotion and reproduction while they reorganize bodies by depleting body reserves building up gonadal tissue. Here we show how European eel (Anguilla anguilla) breaks down its skeleton redistribute phosphorus calcium from hard soft tissues during sexual development. Using multiple analytical imaging techniques, characterize spatial temporal...
Abstract Vertical distribution patterns and relative abundance of mesopelagic fish species other major taxonomic groups were investigated through vertically stratified trawl sampling hydroacoustic analyses along the subtropical convergence zone from 52° W to 70° in oligotrophic Sargasso Sea. Persistent stationary layers several migrating components different scattering characteristics detected. The results reveal varying vertical migration patterns, including times onset diel depths a...
Abstract In fisheries management, accurate stock assessment is pivotal to determine sustainable harvest levels or the scope of conservation measures. When decentralized and methods differ regionally, adopted approaches must be subjected rigorous quality-checking, as biased assessments may mislead management decisions. To enable recovery critically endangered European eel, EU countries fulfill a biomass target potential spawner (“silver eel”) escapement, while local eel vary widely. We...
The distribution of the leptocephalus larvae European (Anguilla anguilla) and American rostrata) eels collected during recent Sargasso Sea surveys was used to model larval drift. drift trajectories individual larva were back-calculated estimated time spawning, using current data from two global oceanographic assimilation models. results both models give same overall result; widespread spawning extended in December March. also calculated forwards for approximately 1 year. forward modelling...
Abstract The success of European efforts towards the recovery eel (Anguilla anguilla) population will rely on accurate assessments local stock status for implementation conservation measures. Yet, direct and continuous monitoring escapement potential spawners (“silver eels”) is unfeasible in most habitats. Therefore, models are widely used to estimate silver escapement, but require input information recruitment, demographic characteristics, mortalities that often estimated with great...