Survival and growth compared between wild and farmed eel stocked in freshwater ponds

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

To evaluate the efficiency of eel stocking, we compared the survival and growth of wild eels (2–5 g) with that of “farmed” eels (3–6 g). Wild eels were caught in a river and farmed eels came from a farm, where wild imported glass eels are cultured. Two experiments of 5–12 month duration were conducted in a series of shallow, open ponds of approximately 200 m2. Wild and farmed eels were batch tagged, mixed and released in the ponds at an initial density of 0.5 individual/m2. Survival was rather high (34–88%) with variations between ponds. No significant difference in survival was found between wild and farmed during the first 5 month in both experiments. Growth rates were significantly higher for farmed eels compared to wild eels in both experiments. The results show that farmed eels performed better than wild eels. In regions with low recruitment the eel population may be increased by importing glass eels, stocked directly or stocked as on-grown farmed eel. The optimal size for stocking (between glass- and 3 g eels) may be determined through future studies
Original languageEnglish
JournalFisheries Research
Volume194
Pages (from-to)112-116
ISSN0165-7836
DOIs
Publication statusPublished - 2017

Cite this

@article{869fe6fc8a3a4155bf693049caf3da76,
title = "Survival and growth compared between wild and farmed eel stocked in freshwater ponds",
abstract = "To evaluate the efficiency of eel stocking, we compared the survival and growth of wild eels (2–5 g) with that of “farmed” eels (3–6 g). Wild eels were caught in a river and farmed eels came from a farm, where wild imported glass eels are cultured. Two experiments of 5–12 month duration were conducted in a series of shallow, open ponds of approximately 200 m2. Wild and farmed eels were batch tagged, mixed and released in the ponds at an initial density of 0.5 individual/m2. Survival was rather high (34–88{\%}) with variations between ponds. No significant difference in survival was found between wild and farmed during the first 5 month in both experiments. Growth rates were significantly higher for farmed eels compared to wild eels in both experiments. The results show that farmed eels performed better than wild eels. In regions with low recruitment the eel population may be increased by importing glass eels, stocked directly or stocked as on-grown farmed eel. The optimal size for stocking (between glass- and 3 g eels) may be determined through future studies",
author = "Pedersen, {Michael Ingemann} and Niels Jepsen and Gorm Rasmussen",
year = "2017",
doi = "10.1016/j.fishres.2017.05.013",
language = "English",
volume = "194",
pages = "112--116",
journal = "Fisheries Research",
issn = "0165-7836",
publisher = "Elsevier",

}

Survival and growth compared between wild and farmed eel stocked in freshwater ponds. / Pedersen, Michael Ingemann; Jepsen, Niels; Rasmussen, Gorm.

In: Fisheries Research, Vol. 194, 2017, p. 112-116.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Survival and growth compared between wild and farmed eel stocked in freshwater ponds

AU - Pedersen, Michael Ingemann

AU - Jepsen, Niels

AU - Rasmussen, Gorm

PY - 2017

Y1 - 2017

N2 - To evaluate the efficiency of eel stocking, we compared the survival and growth of wild eels (2–5 g) with that of “farmed” eels (3–6 g). Wild eels were caught in a river and farmed eels came from a farm, where wild imported glass eels are cultured. Two experiments of 5–12 month duration were conducted in a series of shallow, open ponds of approximately 200 m2. Wild and farmed eels were batch tagged, mixed and released in the ponds at an initial density of 0.5 individual/m2. Survival was rather high (34–88%) with variations between ponds. No significant difference in survival was found between wild and farmed during the first 5 month in both experiments. Growth rates were significantly higher for farmed eels compared to wild eels in both experiments. The results show that farmed eels performed better than wild eels. In regions with low recruitment the eel population may be increased by importing glass eels, stocked directly or stocked as on-grown farmed eel. The optimal size for stocking (between glass- and 3 g eels) may be determined through future studies

AB - To evaluate the efficiency of eel stocking, we compared the survival and growth of wild eels (2–5 g) with that of “farmed” eels (3–6 g). Wild eels were caught in a river and farmed eels came from a farm, where wild imported glass eels are cultured. Two experiments of 5–12 month duration were conducted in a series of shallow, open ponds of approximately 200 m2. Wild and farmed eels were batch tagged, mixed and released in the ponds at an initial density of 0.5 individual/m2. Survival was rather high (34–88%) with variations between ponds. No significant difference in survival was found between wild and farmed during the first 5 month in both experiments. Growth rates were significantly higher for farmed eels compared to wild eels in both experiments. The results show that farmed eels performed better than wild eels. In regions with low recruitment the eel population may be increased by importing glass eels, stocked directly or stocked as on-grown farmed eel. The optimal size for stocking (between glass- and 3 g eels) may be determined through future studies

U2 - 10.1016/j.fishres.2017.05.013

DO - 10.1016/j.fishres.2017.05.013

M3 - Journal article

VL - 194

SP - 112

EP - 116

JO - Fisheries Research

JF - Fisheries Research

SN - 0165-7836

ER -