Tatiana Colchen

University of Angers | UA · UFR Sciences

Cannibalism is an intra-specific predation often resulting in massive mortality in intensive cultured fish species. In piscivorous species, the onset of predation is inevitable. This study explored the link between predation abilities and the onset of cannibalism in pikeperch larvae, a top predator species, with a potential for the European inland...

Pikeperch (Sander lucioperca) has a high potential for inland aquaculture diversification in Europe. Bottlenecks (i.e. low survival, cannibalism and deformity rates) hamper further expansion of pikeperch culture, because of the weak production performances at the nursery level. To improve the production of pikeperch juveniles under recirculation sy...

The onset of piscivory in fish, resulting in a shift from zooplankton or invertebrate to fish prey, was studied on pikeperch (Sander lucioperca) using behavioural (attack, capture and swimming activity), morphological (allometry) and digestive enzymatic (trypsin, α‐amylase and pepsin) analyses between larvae displaying or not piscivorous behaviour...

Cannibalism is defined as the act of killing and consuming the whole, or major part, of an individual belonging to the same species, irrespective of its stage of development. Intra-cohort cannibalism in fish larval or juvenile stages, which is a major economic problem, has been widely studied in captive fish populations. In our study, we investigat...

Cannibalism occurs in many cultured fish species, especially at the larval and juvenile stages of piscivorous taxa. In farmed percid species, such as pikeperch (Sander lucioperca), intra-cohort cannibalism is a major issue inducing significant losses of the initial stocking density during the first weeks of rearing. Therefore, the present study was...

Cannibalism has been described in 390 teleost fish species belonging to 104 families. In rearing conditions, intra‐cohort cannibalism is one of the major bottlenecks during the early life stages of pikeperch (Sander lucioperca). This study aims to describe precisely the occurrence and the onset of cannibalism of this species during the first two po...

Le cannibalisme intra-cohorte est l’acte de tuer et consommer tout ou partie d’un individu conspécifique du même âge. Longtemps considéré comme un artefact d’élevage, le cannibalisme est maintenant admis comme un phénomène naturel pouvant être soumis à des mécanismes de sélection. Chez les Téléostéens, il est majoritairement référencé au niveau des...

Cannibalism is a predatory feeding strategy involving to kill and consume the whole or major part of an individual belonging to the same species, irrespective of its stage of development. In fish, cannibalism was observed in 390 species of teleost and is one of the major bottlenecks in larviculture. In pikeperch (Sander lucioperca) modification of...

Cannibalism is the act of killing and consuming congeners, irrespective of its stage of development, and thus could be considered as intraspecific predation. The onset of predatory behaviour occurs during ontogeny in parallel to feeding shift (from zooplankton to fish). As the control of cannibalism by manipulating external factors (environmental,...

Fish learning and cognition are usually approached by testing single individuals in various devices such as mazes that have serious drawbacks, especially in gregarious species, including the stress induced by the test procedure. This might impair the results and lead to misinterpretation about the learning abilities of the targeted species. In orde...

A host of abiotic factors modify fish social behaviour. However, few studies have characterised the effects of temperature on behaviour. In this study, brown trout Salmo trutta fry were reared at five different temperatures (4, 6, 8, 10 and 12°C). In order to characterise group structure, three behavioural parameters were investigated: group social...

Fish learning and cognition are usually approached by testing single individuals in various devices such as mazes that have serious drawbacks, especially in gregarious species, including the stress induced by the test procedure. This might impair the results and lead to misinterpretation about the learning abilities of the targeted species. In orde...

Cannibalism is the act of killing and consuming congeners, irrespective of its stage of development(1), and thus could be considered as intraspecific predation(2). The predatory behavior takes place during ontogeny in parallel to feeding modifications (from zooplankton to fish) (3). Cannibalism starts between 16 and 22 days post hatching (dph) (4)...

Cannibalism is an important bottleneck of the larval rearing of pikeperch. It is defined as the act of killing and consuming the whole, or major part of an individual belonging to the same species, irrespective of its stage of development. It has never been eliminated by varying environmental factors like temperature or light intensity. So cannibal...