Effects of Population Size on the Collective Behavior of Juvenile Bighead Carp

doi:10.11924/j.issn.1000-6850.casb2021-0732

Abstract

Abstract:

Collective behavior is a common phenomenon in nature, about half of all fish species shoal for part or all their lives. In order to investigate the effect of population size on the collective behavior of juvenile bighead carp (Hypophthalmichthys nobilis), the Lolitrack software was used to compare the differences in spontaneous swimming speed and spatial distribution among experimental fish populations with different numbers of individuals in this study. The results showed that the spontaneous swimming speed of juvenile bighead carp was mostly in the range of 0-6 cm/s, and there was no significant difference in the average swimming speed among populations with of 1, 2, 4 and 8 individuals, indicating that the population size had no significant effect on the spontaneous swimming speed of juvenile bighead carp. The synchrony of all experimental groups were high and significantly decreased with the increase of population size (P<0.05). The nearest neighbor distance (NND) and mean neighbor distance between the focus fish and other experimental fish in the population were mostly distributed at 2-8 cm and 4-14 cm, respectively. The NND of the population with 2 individuals was significantly higher than the population with 4 and 8 individuals (P<0.05). The polarity of populations with 2 (83%) and 4 (88%) individuals were significantly higher than that with 8 individuals (68%, P<0.05). In conclusion, these findings indicate that juvenile bighead carp has obvious collective behaviors. On the one hand, the population size has little effect on the spontaneous swimming speed of juvenile bighead carp, and on the other hand, the population size has significant effect on its spatial distribution. In this study, the effects of population size on the cluster parameters of bighead carp are investigated, and the study is of practical significance for ecological breeding and fishery management of economic fish.

Key words: Hypophthalmichthys nobilis, collective behavior, nearest neighbor distance, synchronization, polarity

CLC Number:

S931.1

ZHAO Hanjing, HAN Jianrong, JIN Yuqin, CHEN Yongjin. Effects of Population Size on the Collective Behavior of Juvenile Bighead Carp[J]. Chinese Agricultural Science Bulletin, 2022, 38(23): 143-149.

Figures/Tables 6

References 31

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