Foot damages of the clam Meretrix lamarckii caused by clam dredging.

Yamasaki, Shintaro; Higano, Junya

doi:10.2331/suisan.68.368

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Miguel B. Gaspar et al (2002) indicated that the tooth spacing has a significant effect on the percentage of damaged and dead individuals (Yamasaki et al, 2002). In the shellfish vibratory harvesting process, when the shellfish moves to the combination part between the first layer vibrating screen and the second layer vibrating screen, the shellfish at the front end of the second layer vibrating screen was easily broken by the mechanical impact force, but the crushing is not caused by vibration (Rambaldi et al, 2001).…”

Section: Shellfish Crushing Ratementioning

confidence: 99%

See 1 more Smart Citation

Design and testing of a mechanized brush-screen cooperative vibration harvester for mudflat-buried shellfish based on the discrete element method

Zhang

et al. 2023

Front. Mar. Sci.

View full text Add to dashboard Cite

IntroductionTo enhance the application of mechanized harvesting and supplement research on harvesting theory in mudflat-buried shellfish harvesting in China, a brush-screen cooperative mudflat-buried shellfish vibration harvester was designed.MethodsThe harvester is primarily composed of a crank rocker double-layer vibrating screen, two stage rolling brush, and a conveyor chain. White clams (Mactra veneriformis) cultured in mudflats were used as the research objects in this paper, and the mechanics and motion states of the shellfish on the vibrating screen were analyzed. The shellfish harvesting simulation response surface experiments based on the discrete element method (DEM) were conducted to analyze the influence of the main operating parameters on the quantity of shellfish harvested.ResultsThe results revealed that the number of shellfish harvested was significantly influenced (p< 0.01) by vibrating screen amplitude, first-stage spiral rolling stainless steel brush rotation rate, and harvester travel speed. The optimal combination of key parameters was 1.4 mm, 40 rpm, and 10 m/min, respectively. With these values, the projected shellfish crushing rate was 2.82% and the shellfish harvesting efficiency was 125 pieces/m2. The equipment was then manufactured and the shellfish harvesting verification test was performed under the same operating parameters as the simulation. Test results indicated that the harvesting efficiency of the equipment was 114 pieces/m2 and the shellfish crushing rate was 6.97%.DiscussionThe shellfish harvesting work could be completed by the equipment effectively and with low loss. The results of this study provide a theoretical reference for a novel mechanized method of harvesting mudflat-buried shellfish.

show abstract

Section: Shellfish Crushing Ratementioning

confidence: 99%

“…Through years of development, commercial dredge (Miguel B. Gaspar et al, 2002;Yamasaki et al, 2002) and hydraulic dredge has become widely employed (Mu et al, 2020). It utilizes high-pressure water jets on the seafloor to spread the sediment and then catch shellfish using nets with rake teeth.…”

Section: Introductionmentioning

confidence: 99%

Design and testing of a mechanized brush-screen cooperative vibration harvester for mudflat-buried shellfish based on the discrete element method

Zhang

et al. 2023

Front. Mar. Sci.

View full text Add to dashboard Cite

show abstract

“…Dredges are the main fishing gears for harvesting shellfish such as the Sakhalin surf clam Pseudocardium sachalinense and the hard clam Meretrix lamarckii 1,2 . Most clam dredges have rake‐like teeth on the lower leading edge of the mouth to dig clams out of the seabed while being towed along the bottom 3,4 .…”

Section: Introductionmentioning

confidence: 99%

Modelling the contact probability and size-selectivity of toothed dredges

Mituhasi

Kitakado

et al. 2005

Fisheries Sci

View full text Add to dashboard Cite

To estimate fishing gear selectivity of clam dredges from data of paired-gear tests in the SELECT analysis process, this paper presents a statistical model of the probability of a clam coming into contact with the dredge teeth and size-selectivity of the control gear. The net-mouth available selectivity is defined as the product of the probability of a clam contacting the dredge teeth and sizeselectivity induced by tooth spacing. The model based on the SELECT analysis was tested by using data generated by virtual paired-gear test in which the control dredge of the smallest tooth spacing is assumed to be size-selective. No clear difference in shell length distribution between dredges of different tooth spacings was found in the simulation when the contact probability was small. The plots of proportion of clams caught in the test dredge to the total catch number of clams were U-shaped, and the model fitted the data well. For each simulation consisting of 500 replications, the sample mean and mean square error of each parameter were obtained to evaluate the performance of estimation by comparing with the true value. Parameters were properly estimated with the model.

show abstract

Foot damages of the clam Meretrix lamarckii caused by clam dredging.

Cited by 2 publications

References 0 publications

Design and testing of a mechanized brush-screen cooperative vibration harvester for mudflat-buried shellfish based on the discrete element method

Design and testing of a mechanized brush-screen cooperative vibration harvester for mudflat-buried shellfish based on the discrete element method

Modelling the contact probability and size-selectivity of toothed dredges

Contact Info

Product

Resources

About