Carp feeding activity and habitat utilisation in relation to supplementary feeding in a semi-intensive aquaculture pond

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081766%3A_____%2F16%3A00462470" target="_blank" >RIV/68081766:_____/16:00462470 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s10499-016-0061-6" target="_blank" >http://dx.doi.org/10.1007/s10499-016-0061-6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10499-016-0061-6" target="_blank" >10.1007/s10499-016-0061-6</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Carp feeding activity and habitat utilisation in relation to supplementary feeding in a semi-intensive aquaculture pond

Popis výsledku v původním jazyce

A combination of radio telemetry and electrofishing was used to assess seasonalnfeeding activity and habitat utilisation of common carp (Cyprinus carpio) in a large (130 ha) semi-intensive aquaculture pond receiving supplementary feed. While telemetry indicated no difference in fish habitat utilisation by size, age or sample year, all fish showed a strong preference for the supplementary feed area (SFA) during the feeding period, electrofishing indicating a 159 higher fish concentration. Despite this, not all of the feed provided was eaten immediately. Carp activity was more evenly spread over the pond in summer/autumn and more concentrated at the SFA in spring. There was a significant shift to deeper waters in winter. Diet analysis indicated a high preponderance of cereal in SFA fish, with natural food (mainly zooplankton) dominant at natural feeding areas. The proportion of "emergency" food (e.g. detritus) was similar in both areas, as was the index of gut fullness. Our results confirm that concentrated and repeated supplementary feeding in one area results in aggregation of carp, potentially leading to uneven population growth and flesh quality and reduced water quality from turbidity and increased nutrient input. As an alternative, we suggest spreading less supplemental feed over a greater area at wider time intervals. This would ensure (a) full utilisation of feed, reducing costs and increasing water quality, and (b) more homogenous fish distribution, ensuring more efficient use of natural food, reduced turbidity, more homogenous size/weight distribution and improved product quality.

Název v anglickém jazyce

Carp feeding activity and habitat utilisation in relation to supplementary feeding in a semi-intensive aquaculture pond

Popis výsledku anglicky

A combination of radio telemetry and electrofishing was used to assess seasonalnfeeding activity and habitat utilisation of common carp (Cyprinus carpio) in a large (130 ha) semi-intensive aquaculture pond receiving supplementary feed. While telemetry indicated no difference in fish habitat utilisation by size, age or sample year, all fish showed a strong preference for the supplementary feed area (SFA) during the feeding period, electrofishing indicating a 159 higher fish concentration. Despite this, not all of the feed provided was eaten immediately. Carp activity was more evenly spread over the pond in summer/autumn and more concentrated at the SFA in spring. There was a significant shift to deeper waters in winter. Diet analysis indicated a high preponderance of cereal in SFA fish, with natural food (mainly zooplankton) dominant at natural feeding areas. The proportion of "emergency" food (e.g. detritus) was similar in both areas, as was the index of gut fullness. Our results confirm that concentrated and repeated supplementary feeding in one area results in aggregation of carp, potentially leading to uneven population growth and flesh quality and reduced water quality from turbidity and increased nutrient input. As an alternative, we suggest spreading less supplemental feed over a greater area at wider time intervals. This would ensure (a) full utilisation of feed, reducing costs and increasing water quality, and (b) more homogenous fish distribution, ensuring more efficient use of natural food, reduced turbidity, more homogenous size/weight distribution and improved product quality.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

EG - Zoologie

OECD FORD obor

—

Projekt

<a href="/cs/project/GBP505%2F12%2FG112" target="_blank" >GBP505/12/G112: ECIP - Evropské centrum ichtyoparazitologie</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Aquaculture International

ISSN

0967-6120

e-ISSN

—

Svazek periodika

24

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

1627-1640

Kód UT WoS článku

000389609200008

EID výsledku v databázi Scopus

2-s2.0-84986276598