Feeding and growth of glass eels, Anguilla anguilla L.: the effect of feeding stimulants on feed intake, energy metabolism and growth

Fishways are built on obstacles to restore the connectivity between aquatic habitats. Our study investigated how species-specific fishways interact with interindividual trait differences among fish. We compared several groups of glass eels (Anguilla anguilla) climbing two types of fishways with those remaining below the water impoundments. We analyzed relative body condition factor, body length, mass, and in vitro activities and gene transcription levels of several enzymes involved in the energy metabolism (LDH, CS, CCO, PK). Differences among groups indicated that glass eel fish ladders can be size-specific, according to the type of substrate covering the surface of apparatus. Moreover, we found that climbing specific glass eel ladders can require higher endurance-related metabolic traits, triggering increased aerobic capacities. Increased aerobic efforts together with potential size selectivity of fishways should be taken into account when designing such devices and choosing appropriate location on eel migratory pathways.

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Effect of feeding stimulants on growth performance, feed intake and appetite regulation of mandarin fish, Siniperca chuatsi

Aquaculture Research ◽

10.1111/are.14327 ◽

2019 ◽

Vol 50 (12) ◽

pp. 3684-3691 ◽

Cited By ~ 2

Author(s):

Liao Li ◽

Jinguang Fang ◽

Xu‐Fang Liang ◽

Muhammad Shoaib Alam ◽

Liwei Liu ◽

...

Keyword(s):

Growth Performance ◽

Feed Intake ◽

Appetite Regulation ◽

Feeding Stimulants ◽

Mandarin Fish ◽

Siniperca Chuatsi ◽

Effect Of Feeding

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Faculty of 1000 evaluation for Glass eels (Anguilla anguilla) have a magnetic compass linked to the tidal cycle.

F1000 - Post-publication peer review of the biomedical literature ◽

10.3410/f.727701072.793533095 ◽

2017 ◽

Author(s):

Ferdinando Boero

Keyword(s):

Tidal Cycle ◽

Anguilla Anguilla ◽

Magnetic Compass ◽

Glass Eels

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Challenges to quantifying glass eel abundance from large and dynamic estuaries

ICES Journal of Marine Science ◽

10.1093/icesjms/fsx182 ◽

2017 ◽

Vol 75 (2) ◽

pp. 727-737 ◽

Cited By ~ 1

Author(s):

Sarah Walmsley ◽

Julie Bremner ◽

Alan Walker ◽

Jon Barry ◽

David Maxwell

Keyword(s):

Large Scale ◽

Anguilla Anguilla ◽

Commercial Fishing ◽

European Eel ◽

Estuarine System ◽

Glass Eel ◽

The North ◽

Adequate Sampling ◽

South Shore ◽

Glass Eels

Abstract European eel Anguilla anguilla recruitment into the rivers of the northeastern Atlantic has declined substantially since the 1980s. Monitoring of recruiting juveniles, or glass eels, is usually undertaken in small estuaries and rivers. Sampling of large-scale estuaries is rare, due to the size of the sampling area and the resources needed to provide adequate sampling levels. Here we describe surveys for glass eels in the UK’s largest estuarine system, the Severn Estuary/Bristol Channel. We sampled across a 20 km-wide stretch of the estuary in 2012 and 2013, using a small-meshed net deployed from a commercial fishing trawler, and the surveys yielded over 2500 glass eels. Eels were more abundant in the surface layer (0–1.4 m depth) than at depth (down to 8.4 m depth), were more abundant close to the south shore than along the north shore or middle of the estuary, and were more abundant in lower salinity water. Numbers were higher in the second year than in the first and eels were more abundant in February than April. The difficulties and logistics of sampling in such a large estuary are discussed, along with the level of resources required to provide robust estimates of glass eel abundance.

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