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2016 ; 11
(8
): e0159807
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gab.com Text
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English Wikipedia
An Enriched Environment Promotes Shelter-Seeking Behaviour and Survival of
Hatchery-Produced Juvenile European Lobster (Homarus gammarus)
#MMPMID27560932
Aspaas S
; Grefsrud ES
; Fernö A
; Jensen KH
; Trengereid H
; Agnalt AL
PLoS One
2016[]; 11
(8
): e0159807
PMID27560932
show ga
The high loss of newly released hatchery-reared European lobster (Homarus
gammarus) juveniles for stock enhancement is believed to be the result of
maladaptive anti-predator behaviour connected to deprived stimuli in the hatchery
environment. Our objective was to learn if an enriched hatchery environment
enhances shelter-seeking behaviour and survival. In the "naïve" treatment, the
juveniles were raised in single compartments without substrate and shelter
whereas juveniles in the "exposed" treatment experienced substrate, shelter and
interactions with conspecifics. Three experiments with increasing complexity were
conducted. Few differences in shelter-seeking behaviour were found between
treatments when one naïve or one exposed juvenile were observed alone. When
observing interactions between one naïve and one exposed juvenile competing for
shelter, naïve juveniles more often initiated the first aggressive encounter. The
third experiment was set up to simulate a release for stock enhancement. Naïve
and exposed juveniles were introduced to a semi-natural environment including
substrate, a limited number of shelters and interactions with conspecifics.
Shelter occupancy was recorded three times during a period of 35 days. Exposed
juveniles occupied more shelters, grew larger and had higher survival compared
with naïve juveniles. Our results demonstrate that experience of environmental
complexity and social interactions increase shelter-seeking ability and survival
in hatchery reared lobster juveniles.