DOI: 10.5061/dryad.mgqnk994x
title: The catches of different lamps using on the falling-net fishing vessels in South China Sea

description: 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.
description: 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").
description: # The catches of different lamps using on the falling-net fishing vessels
 in South China Sea 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: . 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,