The catches of different lamps using on the falling-net fishing vessels in South China Sea
Data files
Aug 21, 2023 version files 100.90 KB
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Data_of_the_First_Experiment.xlsx
35.18 KB
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Data_of_the_Second_Experiment.xlsx
31.98 KB
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README.md
5.43 KB
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Species_and_Probability_of_Catches.xlsx
28.31 KB
Jan 24, 2024 version files 76.44 KB
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Data_of_the_First_Experiment.xlsx
20.72 KB
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Data_of_the_Second_Experiment.xlsx
22.06 KB
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README.md
5.35 KB
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Species_and_Probability_of_Catches.xlsx
28.31 KB
Abstract
Falling nets are a type of fishing gear that appeared and developed rapidly in the northern of South China Sea in the early 1990s. We have developed Light-emitting diode (LED) fishing lamps to replace metal halide (MH) lamps that reduce fuel consumption without reducing the catches. We conducted marine light-fishing experiments in the northern South China Sea from September 20 to 26, 2019, and August 29 to 31, 2021. The results in the first fishing experiment show that there is no significant change in catch of the falling-net fishing vessel when the white LED lamps (with a total power of 36 kW) were used instead of MH lamps (with a total power of 120 kW). Squid catches of the falling-net fishing vessel increased significantly when white LED lamps (with a total power of 36 kW) and cyan LED lamps (with a total power of 6.0 kW) were used. The results in the second fishing experiment show that the total weight of catches of the cyan LED fishing lamps is more than that of the white LED fishing lamps, and the cyan LED light can attract Penaeus merguiensis and Thryssa dussumieri more effectively than the white LED light.
Falling nets are a type of fishing gear that appeared and developed rapidly in the northern of South China Sea in the early 1990s. We have developed Light-emitting diode (LED) fishing lamps to replace metal halide (MH) lamps that reduce fuel consumption without reducing the catches. We conducted marine light-fishing experiments in the northern South China Sea during September 20 to 26, 2019 and August 29 to 31, 2021. The results in the first fishing experiment show that there is no significant change in catch of the falling-net fishing vessel when the white LED lamps (with a total power of 36 kW) were used instead of MH lamps (with a total power of 120 kW). Squid catches of the falling-net fishing vessel increased significantly when white LED lamps (with a total power of 36 kW) and cyan LED lamps (with a total power of 6.0 kW) were used. The results in the second fishing experiment show that the total weight of catches of the cyan LED fishing lamps is more than that of the white LED fishing lamps, and the cyan LED light can attract Penaeus merguiensis and Thryssa dussumieri more effectively than the white LED light.
Description of the data
A total of 120 MH lamps (power P = 1 kW) were used on the nights of September 20th and 21st, 2019, and the lamps were fixed vertically on two cross bars above the falling-net vessel; 120 white LED fishing lamps (P = 300 W) were used on the nights of September 23rd and 24th, 2019, and the LED lamps were fixed at almost the same position as the MH lamps. The direction of luminous COBChip On Boardof the LED lamps was downward, diverged at about 30 degrees from the horizontal direction; in addition to the 120 white LED fishing lamps, 20 cyan LED fishing lamps (P = 300 W) were fixed on the two vessel sides on the nights of September 25th and 26th, and the direction of luminous COB of the cyan LED lamps was downward diverging at about 45 degrees from the horizontal direction. The fishing lights were turned on to gather fish at ~8 pm every night. Four net-fishing operations could be completed every night, which means that we had eight net catches under each lighting condition. After each net collection, the catches were classified and weighted, and species and weight of catches were recorded. The data of each net catch can be found in the document “Data of the First Experiment”. Data of time 1-4 in sheet “MH Lamp” are obtained on September 20th, and data of time 5-8 in sheet “MH Lamp” are obtained on September 21st; Data of time 1-4 in sheet “White LED” are obtained on September 23rd, and data of time 5-8 in sheet “White LED” are obtained on September 24th; Data of time 1-4 in sheet “White&Cyan LED” are obtained on September 25th, and data of time 5-8 in sheet “White&Cyan LED” are obtained on September 26th.
The second experiment was conducted from August 29 to 31, 2021, in order to compare the fishing effect of cyan light LED lamp and white light LED lamp. White LED lamps and cyan LED lamps are equipped on two ships respectively, and the fixed positions are almost the same (fixed on the two cross bars above each falling-net fishing vessel). The total power of LED lights on each vessel is 36 Kw. The experimental sites of the two vessels are about 3 kilometers apart. The fishing lights were turned on to gather fish at ~8 pm every night. Four net-fishing operations could be completed every night, which means that we had eight net catches under each lighting condition. After each net collection, the catches were classified and weighted, and species and weight of catches were recorded. The data of each net catch can be found in the document “Data of the Second Experiment”. Data of time 1-4 in sheets “White LED” and “Cyan LED” are obtained on August 29th, and data of time 5-8 in two sheets are obtained on August 31st. The IRI in the document “Data of Second Experiment” is the index of relative importance (IRI) which is used to analyze the dominant species caught with different fishing lamps, and value of IRI in each row is equal to the sum of mantissa percentage and mass percentage multiplied by 10000 times of occurrence frequency.
After identification, there is little difference between the catch species of the white LED fishing lamps and that of the cyan LED fishing lamps. There are 37 catch species of the white LED fishing lamps and 36 catch species of cyan LED fishing lamps (the data can be found in the document “Species and Probability of Catches”). The value of “Probability of Catches” is “High” which means that the weight percentage of the catch is above 5%, the value is “Moderate” which means that the weight percentage of the catch is about 1%~5%, and the value is “Low” which means that the weight percentage of the catch is below 1%.
All the data files can be opened using Excel or WPS. The unit used for weight of “Data of the First Experiment” and “Data of the Second Experiment” is Kilogram.
Sharing/Access information
You can find the Dataset using the link: https://doi.org/10.5061/dryad.mgqnk994x.
You can cite the data as : Wang, Chunxi et al. (2024), The catches of different lamps using on the falling-net fishing vessels in South China Sea, Dryad, Dataset, https://doi.org/10.5061/dryad.mgqnk994x
A total of 120 MH lamps (power P = 1 kW) were used on the nights of September 20 and 21, 2019, and the lamps were fixed vertically on two cross bars above the falling-net vessel; 120 white LED fishing lamps (P = 300 W) were used on the nights of September 23 and 24, 2019, and the LED lamps were fixed at almost the same position as the MH lamps. The direction of luminous COB Chip On Board) of the LED lamps was downward, diverged at about 30 degrees from the horizontal direction; in addition to the 120 white LED fishing lamps, 20 cyan LED fishing lamps (P = 300 W) were fixed on the two vessel sides on the nights of September 25 and 26, and the direction of luminous COB of the cyan LED lamps was downward diverging at about 45 degrees from the horizontal direction. The fishing lights were turned on to gather fish at ~8 pm every night. Four net-fishing operations could be completed every night, which means that we had eight net catches under each lighting condition. After each net collection, the catches were classified and weighted, and species and weight of catches were recorded. The data of each net catch can be found in the document "Data of the First Experiment".
The second experiment was conducted from August 29 to 31, 2021, in order to compare the fishing effect of cyan light LED lamp and white light LED lamp. White LED lamps and cyan LED lamps are equipped on two ships respectively, and the fixed positions are almost the same (fixed on the two cross bars above each falling-net fishing vessel). The total power of LED lights on each vessel is 36 Kw. The experimental sites of the two vessels are about 3 kilometers apart. The fishing lights were turned on to gather fish at ~8 pm every night. Four net-fishing operations could be completed every night, which means that we had eight net catches under each lighting condition. After each net collection, the catches were classified and weighted, and species and weight of catches were recorded. The data of each net catch can be found in the document "Data of the Second Experiment".
After identification, there is little difference between the catch species of the white LED fishing lamps and that of the cyan LED fishing lamps. There are 37 catch species of the white LED fishing lamps and 36 catch species of cyan LED fishing lamps (the data can be found in the document "Species and Probability of Catches").