Self-feeding activity of a pleuronectiform fish, the barfin flounder

Sunuma, Toshikazu; Amano, Masafumi; Yamanome, Takeshi; Furukawa, Kiyoshi; Yamamori, Kunio

doi:10.1016/j.aquaculture.2007.04.083

Cited by 25 publications

(15 citation statements)

References 9 publications

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“…As a result, few food pellets remained in the tanks. These results confirm the previous results that self-feeding is applicable to barfin flounder under natural conditions [6].…”

Section: Discussionsupporting

confidence: 94%

“…At the start of the experiment, a self-feeder (Yamaha Motor, Shizuoka, Japan) with a string trigger and a switch sensor (Z-15HW78, Omron, Kyoto, Japan), and a CCD camera (TR-851WCP, Corona, Tokyo, Japan) were placed in each tank. Since the barfin flounder immediately learned self-feeding [6], the self-feeder was not set during the acclimation period in the present study. Activation of the self-feeder resulted in the delivery of three pellets (approximately 0.2 g in total), and each activation was recorded by an event logger (RVR-52, T&D, Nagano, Japan).…”

Section: Experimental Conditionmentioning

confidence: 99%

“…To this end, in our previous study, the self-feeding activity of group-reared barfin flounder was examined under natural photoperiod and water temperature [6]. From day 1, selffeeding activity was observed in all tanks.…”

Section: Introductionmentioning

confidence: 99%

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Individual variability of self-feeding activity in group-reared barfin flounder

et al. 2009

Self Cite

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Individual variability of self-feeding activity in group-reared barfin flounder Verasper moseri was examined under natural photoperiod and water temperature. A self-feeder with a string trigger and a switch sensor, and a charge-coupled device (CCD) camera were placed in each of six tanks. Activation of the self-feeder resulted in delivery of three pellets (approximately 0.2 g in total), and each activation was recorded by an event logger. Selffeeding behavior of tagged fish (three or five fish per tank) was recorded continuously on video for 24 h once a week for 4-12 weeks. In all tanks, the fish learned self-feeding within 2 days, were mostly nocturnal feeders, and immediately consumed all the pellets provided by the feeder. All the fish gained body weight during the experimental period. In three tanks, significant differences were observed in the number of feeder activations per 24 h among individuals, i.e., one fish mainly triggered the switch. In contrast, in the other three tanks, no significant differences were observed in the number of feeder activations per 24 h among individuals. These results indicate that barfin flounder attain appropriate growth by using the self-feeding systems independently of whether or not individual differences in the number of self-feeding activities were observed.

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“…As a result, few food pellets remained in the tanks. These results confirm the previous results that self-feeding is applicable to barfin flounder under natural conditions [6].…”

Section: Discussionsupporting

confidence: 94%

Section: Experimental Conditionmentioning

confidence: 99%

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Individual variability of self-feeding activity in group-reared barfin flounder

et al. 2009

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“…fluviatilis experience a prolonged growth period, due to decreased ice cover and related increased primary productivity, which is limited at this latitude by short days in the winter months (Karås, , ; Snoeijs, ). High temperatures elevate metabolism and feeding activity (Claireaux & Lagardere, ; Sunuma et al , ; Arula et al , ; Slavik & Horky, ), which could partly explain the faster growth rates of young Biotest individuals of P . fluviatilis .…”

Section: Discussionmentioning

confidence: 99%

Warming alters the body shape of European perch Perca fluviatilis

Rowiński

Mateos‐González

Sandblom

et al. 2015

Journal of Fish Biology

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The consequences of elevated temperature on body shape were investigated by comparing European perch Perca fluviatilis from the Forsmark area of the Baltic Sea to P. fluviatilis from a nearby Biotest enclosure. The Biotest is a man-made enclosure within the Baltic Sea that has received warm water from a nuclear power plant since 1980, resulting in temperatures that are elevated 5-10 °C relative to the surrounding Baltic Sea. Sampled fish ranged from young-of-the-year to 14 years. Geometric morphometrics and multivariate statistical analysis revealed significant morphological differences between individuals of P. fluviatilis from these two habitats. Most importantly, relative shape changed with size, with small individuals of P. fluviatilis from Biotest being characterized by a deeper body shape and a larger caudal peduncle than the smaller Baltic individuals. In large specimens, smaller differences were found with Biotest individuals being more slender than Baltic individuals. These results show that, in order to have a full understanding of the biological effects of elevated temperatures, studies that cover the entire size range of organisms will be important. Apart from the direct influence of temperature on growth rate and body shape, other ecological factors affected by temperature are discussed as possible contributors to the observed differences between the two populations.

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“…A trigger consisting of a rod to be pushed or a string to be pulled is usually involved (Alanärä 1996;Rubio et al 2004). Many farmed fish species can learn to operate self-feeders (Divanach et al 1986(Divanach et al , 1993Alanärä 1996;Sunuma et al 2007), but most experiments have focused on feeding activity rather than learning ability and the various aspects of learning rate and effects of reward value have not been described in any detail.…”

Section: Operant Learningmentioning

confidence: 99%