New progress has been made in the analysis of the behavior of marine bivalve shellfish

Recently, the Marine Biological Monitoring Technology Innovation Unit of the Department of Marine Technology Science of Qilu University of Technology (Shandong Academy of Sciences) has made new progress in the field of marine bivalve shellfish behavior analysis, and the relevant results have been published in the TOP journal “Marine Science Frontiers” in the first region of marine and freshwater biology.

Prototype of bivalve shellfish straining behavior monitoring (A) and long-term continuous monitoring of Ezo scallop opening behavior (B, C) Photo courtesy of the research group

China is a big country in shellfish industry, and the development of shellfish health assessment methods is of great significance to reduce the risk of shellfish farming, improve aquaculture production and improve breeding efficiency. However, most of the existing methods are laboratory operations, cumbersome steps, and harm shellfish live. As an important biological behavior of shellfish, the opening and closing behavior of bivalve shellfish is closely related to its daily physiological activities and evasion of predators, which can reflect shellfish activity, environmental tolerance and stress resistance. Therefore, breaking through the non-destructive monitoring technology of shellfish spacing behavior tracking is of positive significance for analyzing shellfish behavior laws and promoting the development of shellfish breeding and breeding industry.

The research team of the Department of Oceanography has developed a sensor suitable for monitoring the behavior of marine bivalve shellfish around the research of shellfish tension and closing behavior monitoring technology. Based on the Hall effect, the electrical signal of shellfish bivalve tensioning behavior is obtained by electromagnetic induction technology, and the actual distance of shellfish double-shell tensioning is calculated according to the potential difference between the linear Hall element and the magnet in the device, so as to realize the in-situ, continuous and real-time monitoring of shellfish double-shell tensioning time, distance, frequency and rate. At present, the prototype can carry out 8-16 channel data acquisition according to the requirements, the sampling interval is 100ms, the accuracy is 1mV, the distance monitoring accuracy is 0.1mm, and the underwater monitoring test has been completed.

Taking the important cultured species of Ezo scallop in northern China as an example, the research team simulated the normal growth environment of shellfish in the laboratory, and found through long-term continuous monitoring that the bivalve tensioning behavior of scallops had the characteristics of daily cycle rhythm, that is, the frequency of opening and closing increased significantly during 7:00-9:00 and 17:00-19:00 every day, and its active time period was similar to the daily rhythm of shellfish heartbeat.

Through continuous monitoring to the natural death of scallops, the research team found that individuals who survived for a long time may have a more uniform daily distribution of fast-opening bivalve movements throughout their monitoring process, suggesting that rate indicators are important parameters reflecting shellfish activity, and shellfish opening behavior is closely related to their body’s energy use metabolism.

Further evaluating the correlation between bivalve opening and closing exercise and scallop viability and mortality, the research team found that the survival potential of scallops could be evaluated by using scallop body size parameters and tensioning motion indexes, and the survival potential prediction coefficient was significantly positively correlated with scallop survival time (R2=0.873, P<0.01). In this regression analysis, the rapid opening capacity and shell width (shellfish thickness index) of shellfish bivalve were important variables to evaluate the survival potential of scallops, and the above indicators were thought to be related to the motor attributes of shell ligaments and muscles, affecting the strength of shellfish opening behavior.

This study provides an efficient and non-destructive evaluation method for predicting shellfish survival potential.

The Marine Biological Monitoring Technology Innovation Unit of the Faculty of Oceanography is mainly engaged in basic research on marine biological signal identification and in situ monitoring methods. Xun Xiaogang, the head of the unit, is the first author of this paper, Kong Xiangfeng, associate researcher of the Innovation Center of Academician of Marine Environmental Intelligent Monitoring Technology, and Hu Xiaoli, professor of the Key Laboratory of Marine Biogenetics and Breeding of the Ministry of Education, Ocean University of China, are the corresponding authors. (Source: China Science News, Liao Yang, Gao Li)

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