The influence of density and dominance on Pacific white shrimp (Litopenaeus vannamei) feeding behaviour

Identifying correct stocking densities is an important concern for shrimp farming especially when intensification of production growing in order to meet increasing demand. Increased generate greater competition among individuals, reduced feeding efficiencies and increased water degradation. Little known, however, about the effects density on behaviour conspecific interactions commercial species. Therefore, aim present study was investigate dominance hierarchies Pacific white (Litopenaeus vannamei). Juvenile (7.91 ± 1.81 g, n = 56) were divided into three treatments (low: 6.2 shrimp/m2, medium: 12.4 shrimp/m2 high: 24.8 shrimp/m2) with four groups at each density. Groups placed feed test arenas recorded 20 min, group eight times consecutive days. Video analysis conducted via automated observation using EthoVision tracking software. Dominance observed within found remain stable across observations. Therefore effect investigated comparisons most dominant subordinate group. Results showed a clear both L. vannamei feeding. A relative consumption high density, even though less time spent area due space limitations tray. Lowest levels activity low-density treatments, coupled higher exploratory (i.e. moving, distance velocity) indicative motivation. Smaller distances extended contact between individuals influenced behaviour; subordinates longer whereas dominants explored arena more, these differences minimised Findings from this therefore revealed how (24.8 maximized behaviours while minimising inefficiencies interactions. The also showcased automatically level.