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24 results for “Fish Trawl”
Data from: Environmental DNA from seawater samples correlate with trawl catches of subarctic, deepwater fishes
Remote polar and deepwater fish faunas are under pressure from ongoing climate change and increasing fishing effort. However, these fish communities are difficult to monitor for logistic and financial reasons. Currently, monitoring of marine fishes largely relies on invasive techniques such as bottom trawling, and on official reporting of global catches, which can be unreliable. Thus, there is need for alternative and non-invasive techniques for qualitative and quantitative oceanic fish surveys. Here we report environmental DNA (eDNA) metabarcoding of seawater samples from continental slope depths in Southwest Greenland. We collected seawater samples at depths of 188–918 m and compared seawater eDNA to catch data from trawling. We used Illumina sequencing of PCR products to demonstrate that eDNA reads show equivalence to fishing catch data obtained from trawling. Twenty-six families were found with both trawling and eDNA, while three families were found only with eDNA and two families were found only with trawling. Key commercial fish species for Greenland were the most abundant species in both eDNA reads and biomass catch, and interpolation of eDNA abundances between sampling sites showed good correspondence with catch sizes. Environmental DNA sequence reads from the fish assemblages correlated with biomass and abundance data obtained from trawling. Interestingly, the Greenland shark (Somniosus microcephalus) showed high abundance of eDNA reads despite only a single specimen being caught, demonstrating the relevance of the eDNA approach for large species that can probably avoid bottom trawls in most cases. Quantitative detection of marine fish using eDNA remains to be tested further to ascertain whether this technique is able to yield credible results for routine application in fisheries. Nevertheless, our study demonstrates that eDNA reads can be used as a qualitative and quantitative proxy for marine fish assemblages in deepwater oceanic habitats. This relates directly to applied fisheries as well as to monitoring effects of ongoing climate change on marine biodiversity—especially in polar ecosystems.
Data from: Environmental DNA from seawater samples correlate with trawl catches of subarctic, deepwater fishes
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Figure 2 in Trophic level of fishes caught by trawls in Thracian Sea
Figure 2. Box-Whisker plot of the mean weighted trophic level (mTroph) for the discarded, marketable and total fish species caught in the Thracian Sea during 1996–1998. Each box represents 50% of the mTroph values. The small square shows the mean, and the whiskers the range.
Vulnerability of six cold-water corals to sediment resuspension from bottom trawling fishing - DATASET
<p>The dataset is related to "Vulnerability of six cold-water corals to sediment resuspension from bottom trawling fishing" research article. The aim of the experiment was to evaluate survival, growth and physiology of six cold-water coral species when exposed to increased suspended sediment concentration (SSC). The treatments are labeled Control, Low SSC and High SSC. The experiment was performed at Institut de Ciències del Mar (ICM) in Barcelona during 9 months. </p> <p>The dataset consists of five sheets in an excel workbook. </p> <ol> <li>Scle_polypN sheet includes scleractinian species polyp numbers at the 0, 4 and 9 months since the start of the experiment.</li> <li>Scle_BW sheet includes scleractinian species buoyant weight in grams measured at 0, 4, 7 and 9 months of the start of the experiment. There are two columns at 9 month, one labeled incubation (when the coral was measured after metabolic incubation) and final (when coral was measured day before the end of the experiment). </li> <li>BC_Gor_Length sheet includes nubbin length data in meters for a black coral (BC) and gorgonian (Gor) measured at 1, 4 and 9 months from the start of the experiment. For each measure error of the scale bar is reported as well. </li> <li>Respiration sheet includes data collected during metabolic incubations performed at 4 and 9 months of the start of the experiment. For scleractinian species it is reported as µmol O2 g<sup>-1</sup>d<sup>-1</sup> and for black coral and gorgonian as µmol O2 cm<sup>-1</sup>d<sup>-1</sup> , found in the last column.</li> <li>Excretion sheet includes data collected during metabolic incubations performed at 4 and 9 months of the start of the experiment. For scleractinian species it is reported as µmol NH<sub>4</sub> g<sup>-1</sup>d<sup>-1</sup> and for black coral and gorgonian as µmol NH<sub>4</sub> cm<sup>-1</sup>d<sup>-1</sup> , found in the last column.</li> </ol>
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