Fatigue Metabolites of Large Yellow Croaker and Construction of Swimming Model

Abstract

A trend in large yellow croaker (Larimichthys crocea) aquaculture is to establish new production sites that are suitable for extreme weather conditions. However, continuous and strong currents can harm fish welfare. To determine the location of the net cage, it is necessary to assess the swimming ability of large yellow croaker. Currently, our research on large yellow croakers is focusing on behavior analysis. This article investigates the effect of swimming large yellow croakers on metabolites in the body by examining the preferred speed of the group and the endurance swimming ability of single-tailed fish. We evaluated the factors that influence the large yellow croaker’s swimming fatigue by quantifying the content of metabolites and constructed the endurance swimming model using those results. Various results showed large yellow croaker populations tend to grow in low-velocity environments, and this matches their traditional habitat. The samples were taken at different swimming times at a flow rate of 0.35 m/s. According to the results of the metabolite content determination, blood glucose levels is closely related to swimming ability in large yellow croakers. The content of liver glycogen, which regulates blood glucose concentration, decreases in a certain linear relationship. The endurance swimming model of large yellow croaker was constructed according to the changes of liver glycogen content. The goals of this article are to provide a deeper understanding of the physiological characteristics of large yellow croaker swimming, and to provide a reference for choosing fishing and cage sites for large yellow croaker.

A Comparative Study on the Quality of Large Yellow Croaker (Larimichthys crocea) of Different Sizes Cultured in Different Cage Systems

“…In the wild, the large yellow croaker lives typically inhabit deeper waters, often reaching depths of up to 60 m, significantly deeper than the conditions in artificial cultivation [7]. These fish move seasonally and prefer low-velocity environments [8]. The use of net cages in the large yellow croaker breeding industry significantly limited fish movement and led to various issues, such as increased susceptibility, whiter skin, lower flesh quality, and higher lipid content [9].…”