A laboratory investigation of the transport mechanism of floating fish eggs: A case study of Asian carps

Jia, Wenfei; Zhang, Shanghong; Yang, Yalin; Yang, Yi

doi:10.1016/j.aquaculture.2019.734855

Cited by 14 publications

(13 citation statements)

References 22 publications

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“…We developed a MATLAB program to extract the egg trajectory coordinates from imagery (Figure 1). The design principle of this program was similar to Prada et al (2018) and Jia et al (2020). The temporal resolution, which is the reciprocal of the camera frame (25 fps in this paper), was 0.04 s. The vertical resolution, which depends on the settling velocity and the temporal resolution, was approximately 0.5 mm (Figure 1b) and around one-tenth of the average egg diameter.…”

Section: Observing and Computing Methods Of Egg Settlement In Static Watermentioning

confidence: 85%

“…This imaging method prevented any damage to eggs and was used by Luo et al (2013). The observations of egg and embryo diameters at the eight desired postfertilization times were fitted to the periods of 0-24 hr postfertilization with regression models (George et al, 2017;Jia, Zhang, Yang, & Yi, 2020).…”

Section: Measuring and Analyzing Methods Of Egg Attributesmentioning

confidence: 99%

“…The observations of egg specific gravity at the eight desired postfertilization times were also fitted to the periods of 0-24 hr post-fertilization by the regression models (George et al, 2017;Jia et al, 2020).…”

Section: Measuring and Analyzing Methods Of Egg Attributesmentioning

confidence: 99%

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Quantification of the microscale dynamics of live bighead carp egg settlement in static water

Wan

Chen

et al. 2021

River Research & Apps

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The survival of bighead carp is threatened by the construction and operation of river engineering projects. In order to guide future reservoir regulation to suitably incorporate the ecological requirements of fish, it is important to understand fish egg settlement in static water. Therefore, video capture technology and wavelet analysis in experiments were used to observe and analyze the microscale processes of live bighead carp egg settlement in static water. The study examined the temporal variations in the egg attributes and revealed microscale fluctuations in the trajectories of eggs and changes in settling velocity. The egg settling velocities were divided into both mean and fluctuating components. Both components indicated that bighead carp eggs had different settling velocities depending on the stage of development. Settling velocity is dominated by hydrodynamic drag in the first 22 min post-fertilization, with a rapid increase in velocity through time, followed by a decrease in velocity and finally a stable value of 0.75 cm/s. The periodicity of the fluctuating component may indicate the importance of the egg inner structure or even the development of the embryo to settling velocity. This work strengthens the understanding of bighead carp egg settlement in static water and provides a clear indication to river engineers and managers of the need to promote the successful drift of bighead carp eggs in rivers to ensure the maintenance of their populations. K E Y W O R D S bighead carp, fish eggs, image processing, settlement in static water, wavelet analysis 1 | INTRODUCTION Bighead carp, one of the four major Chinese carp species in the Yangtze River, is an important economic fish species in China (Fu, Wu,

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Section: Observing and Computing Methods Of Egg Settlement In Static Watermentioning

confidence: 85%

Section: Measuring and Analyzing Methods Of Egg Attributesmentioning

confidence: 99%

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Quantification of the microscale dynamics of live bighead carp egg settlement in static water

Wan

Chen

et al. 2021

River Research & Apps

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“…Where G is gravity, F B is buoyant force, and F C is the sum of vertical forces generated by current flow. F C is derived from water flow, including the effects of drag and flow turbulence (Garcia, 2008;Jia et al, 2020). F C is variable, since it depends on local hydrology (Garcia et al, 2013(Garcia et al, , 2015Liu et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

The Evolution of Alternative Buoyancy Mechanisms in Freshwater Fish Eggs

et al. 2021

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Alternative reproductive tactics (ARTs) are behavioural, morphological, and physiological traits associated with alternative reproductive phenotypes within a population or species. ARTs are widespread in nature, and are a particular feature of teleost fishes. However, few studies have examined egg buoyancy mechanisms in the context of the evolution of ARTs in freshwater fishes. In marine fishes, egg buoyancy is achieved chiefly through hydration. While the buoyancy of freshwater fish eggs has been suggested to be determined primarily through the presence of oil droplets, the majority (60%) of freshwater pelagic eggs do not possess an oil droplet. We applied a physical model of buoyancy to understand the contributions of oil droplets and hydration to the buoyancy of pelagic freshwater fish eggs. We further used phylogenetic regression to estimate the effect of the relative size of the perivitelline space, habitat and parental care on the occurrence of oil droplets, while controlling for non-independence among species due to phylogenetic relatedness. Our analysis demonstrates that the probability of oil droplets in freshwater pelagic eggs exhibits a significant negative relationship with the size of perivitelline space, which may reflect a trade-off relating to energy allocation in contrasting habitats. We also demonstrate a positive association between the probability of oil droplets and the provision of parental care and occupancy of lentic habitats. These findings indicates the evolution of contrasting buoyancy mechanisms as novel ARTs in freshwater fishes. A theoretical model in combination with empirical analysis indicate the evolution of novel ARTs in freshwater fishes as adaptive responses to flow conditions.

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“…The carp eggs absorb water and swell immediately after being spawned. This process is water hardening, and lasts for approximately 4 h (Garcia et al, 2013; George et al, 2017; Jennings, 1988; Jia, Zhang, Yang, & Yi, 2020). Carp egg diameters are approximately 4–6 mm with specific gravities between 1.0015 and 1.0030 and settling velocities of around 0.55–0.90 cm/s in static water after the water hardening process (George et al, 2017; Jia et al, 2020; Tang et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

Oscillation and dispersion of live grass carp egg settlement in static water: Laboratory experiments and theoretical models

Wan

Chen

et al. 2022

River Research & Apps

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Full understanding of the settling process of drifting fish eggs in static water is crucial for improving predictions of fish egg drift in rivers, which can inform reservoir operations by incorporating the ecological requirements of fish. However, current understanding of the settling process remains limited. Observations and analysis of live grass carp egg settlement in static water, with a video capture technology and wavelet analysis, have improved understanding. Results reveal that microscale oscillation and dispersion occur during the settling process. The oscillating velocities of eggs had periods of 0.113 s in longitudinal and 0.135 s in vertical, with oscillating angles around 1.13°. The maximum position differences among eggs after stably settling for 14 s were 25.0 mm in vertical and 4.2 mm in longitudinal. Mechanical models were then established and employed to elucidate two settling phenomena. Simulated results revealed that microscale oscillation was related to biological attributes (the egg specific gravity and diameters of the egg and embryo), special inner structure of the live egg and random hydraulic disturbance of the surroundings. Dispersion was mainly caused by the difference between eggs (diameter and specific gravity). This work furthers understanding and forecasts of fish egg drift in rivers, from which river engineers and managers can better estimate the locations of fish spawning sites, calculate ecological water requirement, and designate ecological conservation areas.

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A laboratory investigation of the transport mechanism of floating fish eggs: A case study of Asian carps

Cited by 14 publications

References 22 publications

Quantification of the microscale dynamics of live bighead carp egg settlement in static water

Quantification of the microscale dynamics of live bighead carp egg settlement in static water

The Evolution of Alternative Buoyancy Mechanisms in Freshwater Fish Eggs

Oscillation and dispersion of live grass carp egg settlement in static water: Laboratory experiments and theoretical models

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