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24 results for “Mugil liza”
Underwater surveys of mullet schools (Mugil liza) with Adaptive Resolution Imaging Sonar
<p>This dataset is part of a research project that employs deep learning, with a density-based regression approach, to count fish in low-resolution sonar images (Tarling et al. preprint arXiv DOI: http://arxiv.org/abs/2104.14964).</p> <p>In this repository, we provide data from sonar-based underwater videos of schools of migratory mullets (<em>Mugil liza</em>) recorded at the Tesoura beach (28.495775 S, 48.759996 W), a 100-meter long beach at the inlet canal connecting the Laguna lagoon system to the Atlantic Ocean, in southern Brazil. Since the water transparency at the lagoon canal is very low (from 0.3 to 1.5m visibility; collected <em>in situ</em> with a Secchi disk), mullet schools were recorded by deploying an Adaptive Resolution Imaging Sonar, ARIS 3000 (Sound Metrics Corp, WA, USA), which uses 128 beams to project a wedge-shaped volume of acoustic energy and convert their returning echoes into a digital overhead view of the mullet schools.</p> <p>This dataset contains 500 fully annotated images that were manually marked for the location and abundance of mullet fish, and 126 raw sonar video files, representing over 100k images. The files are organized as follows:</p> <p>1) "2018-MM-DD_HHMMSS" files are mp4 videos (you may need to add the file extension ".mp4"): There are 126 ARIS files converted into MP4 videos totalling over 789MB of underwater footage captured at 3 frames/seconds. Note that file names indicate the date and time the video was recorded.</p> <p>2) ".npy" files (in Labelled_data.zip): From the video files, 500 images were selected for labelling. Images (x) were cropped to represent a 4x8.5m<sup>2</sup> area and resized to 320 x 576 pixels. Mullet fish were marked with a point annotation. Corresponding ground truth density maps (y) were generated by convolving a Gaussian kernel over the image mask, size =4 and standard deviation = 1. The labelled dataset was randomly split into a holdout partition of 350 training images, 70 validation, and 80 test. </p> <p>3) ".csv" files: log of frames selected for the labelled subset of data</p> <p>4) ".h5" file: pre-trained weights for our multi-task with uncertainty regularisation network</p> <p>To advance the development of these machine learning tools, we also make our code openly available (https://github.com/ptarling/DeepLearningFishCounting).</p>
Fig. 2 in Discrimination of habitat use between two sympatric species of mullets, Mugil curema and Mugil liza (Mugiliformes: Mugilidae) in the rio Tramandaí Estuary, determined by otolith chemistry
Fig. 2. Means and standard deviations (SD) of (a) Sr86:Ca43 (mmol.mol-1); and (b) Ba137:Ca43 ratio (µmol.mol-1) in otoliths of the inner 20 measurements (core) and the outer 20 measurements (edge) of Mugil curema and M. liza caught in the Tramandaí River Estuary, Brazil. Different letters within a spruce stand denote significant differences between species (Mann-Whitney U test, p<0.05).
Fig. 4 in Discrimination of habitat use between two sympatric species of mullets, Mugil curema and Mugil liza (Mugiliformes: Mugilidae) in the rio Tramandaí Estuary, determined by otolith chemistry
Fig. 4. Otolith transects of Mugil liza measured by LA-ICP-MS from the core to the edge. Ba137:Ca43 (line) and Sr86:Ca43 (dashed line). The identification code and total length (mm) of each fish are indicated on the graph.
Fig. 3 in Discrimination of habitat use between two sympatric species of mullets, Mugil curema and Mugil liza (Mugiliformes: Mugilidae) in the rio Tramandaí Estuary, determined by otolith chemistry
Fig. 3. Otolithtransectsof Mugilcurema measuredbyLA-ICP-MSfromthecoretotheedge. 43 (line) 86 43 (dashedline). Theidentificationcodeand totallength (mm) ofeachfishareindicatedonthegraph.
Fig. 5. a in Local ecological knowledge of fishers about the life cycle and temporal patterns in the migration of mullet (Mugil liza) in Southern Brazil
Fig. 5. a) Whole muscular stomach (gizzard) and b) Opened gizzard, with sand and mud (in March), both of mullet (Mugil liza).
Fig. 3 in Local ecological knowledge of fishers about the life cycle and temporal patterns in the migration of mullet (Mugil liza) in Southern Brazil
Fig. 3. Percentage of the interviewed fishers (n=45) that cited the month when mullet exiting lagoons/estuaries ('criadouros') for migration, spawning and return. Some fishermen cited more than one month for each event, five did not knew about when spawning occurred and seven when mullets returned to the lagoons/estuaries.
Fig. 4 in Local ecological knowledge of fishers about the life cycle and temporal patterns in the migration of mullet (Mugil liza) in Southern Brazil
Fig. 4. Abdominal checking of mullet (Mugil liza) sex. a) Female: yellow eggs (n=27) through the urogenital orifice, and b) Male: white eggs/sperm (n=36) through the urogenital orifice.
Fig. 2 in Local ecological knowledge of fishers about the life cycle and temporal patterns in the migration of mullet (Mugil liza) in Southern Brazil
Fig. 2. The life cycle of the mullet Mugil liza following local ecological knowledge of fishers from Santa Catarina State: a) Exit of mullets from 'criadouros' or breeding sites (lagoons and estuaries) to the sea (n= 45); b) Migration of mullets known as 'corrida' (run) and recurrent gathering with smaller schools (schooling or thickening process). The outlined map represents the Santa Catarina State coastline and main stopping/fishing sites for mullets. Arrows corresponds to our data-collection sites, which were indicated as main fishing locations; c) Outline of Santa Catarina State island (Florianópolis city) and Bombinhas as most external (to the East) coastal areas and where larger captures of mullets occurs during the fishing season; d) Male and female spawning with respective milky ('ova leiteira') and yellowish ('ova amarela') gonads. According to most of our informants, after fecundation female mullets may hold their eggs under their scales until they become juvenile; e) Northward migration to São Paulo and Rio de Janeiro states, following by their (adults plus juveniles) southward return to lagoons and estuaries; f) Entrance of adult mullets and recruitment of juveniles in lagoons and estuaries; g) Growth and feeding of adults and juveniles in lagoons and estuaries.
Fig. 1 in Local ecological knowledge of fishers about the life cycle and temporal patterns in the migration of mullet (Mugil liza) in Southern Brazil
Fig. 1. Santa Catarina State coast, data collection sites (triangles) and the number of interviewed fishermen (in parenthesis; total N=45).
Fig. 2 in Effect of salinity on survival, growth and biochemical parameters in juvenile Lebranch mullet Mugil liza (Perciformes: Mugilidae)
Fig. 2. Whole-body oxygen consumption in juvenile Lebranche mullet Mugil liza (n = 6) after acclimation to different salinities for 40 days. Data are expressed as mean ± standard error.
Fig. 1 in Effect of salinity on survival, growth and biochemical parameters in juvenile Lebranch mullet Mugil liza (Perciformes: Mugilidae)
Fig. 1. Gill Na+- K+- ATPase activity in juvenile Lebranche mullet Mugil liza (n = 6) after acclimation to different salinities for 40 days. Data are expressed as mean ± standard error.
Fig. 3 in Acclimation of juvenile Mugil liza Valenciennes, 1836 (Mugiliformes: Mugilidae) to different environmental salinities
Fig. 3. Liver glycogen content in juveniles of the Lebranche mullet Mugil liza maintained at different salinities for 15 days. Values are expressed as mean ± standard error (n = 6). Data were fitted using non-linear regression analysis (polynomial; quadratic).
Fig. 7 in Myxobolus saladensis sp. nov., a new species of gill parasite of Mugil liza (Osteichthyes, Mugilidae) from Samborombón Bay, Buenos Aires, Argentina
Fig. 7. Schematic drawing of the morphology of a spore of Myxobolus saladensis sp. nov. witch infects Mugil liza Valenciennes, 1836 from Argentina.
Figs 5, 6 in Myxobolus saladensis sp. nov., a new species of gill parasite of Mugil liza (Osteichthyes, Mugilidae) from Samborombón Bay, Buenos Aires, Argentina
Figs 5, 6. Myxobolus saladensis sp. nov. parasite of Mugil liza Valenciennes, 1836: 5, sectioned spore showing valves (V) and their suture lines (arrows), polar capsules (PC), different sections of the polar filaments (arrowheads) and some sporoplasmosomes (Sps); 6, detail of apical region of the PCs showing the PC wall (arrows) composed of two layers and the apical stopper (double arrows) and the different sections of the polar filament (arrowheads).
Figs 1-4 in Myxobolus saladensis sp. nov., a new species of gill parasite of Mugil liza (Osteichthyes, Mugilidae) from Samborombón Bay, Buenos Aires, Argentina
Figs 1-4. Light and transmission electron micrographs of the myxosporean Myxobolus saladensis sp. nov. infecting gills and gills rakers of Mugil liza Valenciennes, 1836: 1, semithin section of a plasmodium; 2, isolated spores observed in differential interference-contrast (DIC); 3, ultrathin section of a plasmodium showing several spores at different levels (S); 4, sectioned spore showing the shell valves (V); polar capsules (PC); Sporoplasm (SP) and transverse section of the polar filament (arrows).
FIGURE 21. Mugil liza Valenciennes 1836 in The fish collection of José Mariano da Conceição Veloso (1742-1811) and the beginning of ichthyological research in Brazil, with a taxonomic description of the extant specimens
FIGURE 21. Mugil liza Valenciennes 1836; a: MCUC ZOO.0000028, 385 mm SL; b: MCUC ZOO.0000063, 235 mm SL. Photos by Luis M. P. Ceríaco.
Integrated multitrophic culture of shrimp Litopenaeus vannamei and mullet Mugil liza in biofloc system with different feeding rates for fish
<p>This study aimed to evaluate the effect of different feeding rates for mullets on the zootechnical performance of <em>Litopenaeus vannamei</em> and <em>Mugil liza</em> in an integrated multitrophic culture of shrimp and mullet in a biofloc system and on the efficiency of the system. For this, an experimental study of 46 days was carried out at the Marine Shrimp Laboratory of the Federal University of Santa Catarina. The experiment had four treatments, each one with four replicates: A0 (feed offer for shrimp and no feed offer for mullets), A1 (feed offer for shrimp and offer of 1% of fish biomass of feed for mullets), A2 (feed offer for shrimp and offer of 2% of fish biomass as feed for mullets) and A3 (feed offer for shrimp and offer of 3% of fish biomass for feed for the mullets). Each experimental unit consisted of an 800 L tank, in which shrimp were stocked, and a 90 L tank, used for mullets, connected to a recirculation system. Shrimp were stocked with an initial weight of 2.36 g ± 0.02 g. Mullets’ inicial weight was 17.06 g ± 0.65 g. The stocking density used was 375 shrimp m<sup>-3</sup> (300 shrimp per tank), while the fish density was 167 fish m<sup>-3</sup> (15 fish per tank). Animal growth performance, water quality, as well as total heterotrophic bacteria and <em>Vibrio </em>sp<em>.</em> concentration in the system were evaluated. It was observed that shrimp performance was not affected by different feed offer for fish, having in the end a survival above 82%, weekly growth around 1.50 g and feed conversion factor close to 1.60 in all treatments. Despite the higher input of nutrients into the system with higher food supply, there was no change in the water quality parameters with the treatments, or in the count of total heterotrophic bacteria and <em>Vibrio sp.</em> <a href="#_msocom_1">[1]</a> In conclusion, the best feed supply rate in the integrated cultivation of shrimp and mullet was 2%, due to the proximity of the results of zootechnical performance with the 3% rate, without affecting water quality or the count of total heterotrophic bacteria and genus <em>Vibrio sp.</em></p>
Fig. 5 in Discrimination of habitat use between two sympatric species of mullets, Mugil curema and Mugil liza (Mugiliformes: Mugilidae) in the rio Tramandaí Estuary, determined by otolith chemistry
Fig. 5. Mugil curema. Ba137:Ca43 variations (µmol.mol-1) along transects from the core to the edge of the otolith. Individuals were from the rio Tramandaí Estuary, Brazil. The horizontal gray bands between the Ba137:Ca43 ratios of 0.05 and 0.18 indicate migration in brackish waters (see M&M).
Fig. 6 in Discrimination of habitat use between two sympatric species of mullets, Mugil curema and Mugil liza (Mugiliformes: Mugilidae) in the rio Tramandaí Estuary, determined by otolith chemistry
Fig. 6. Mugil liza. Ba137:Ca43 variations (µmol.mol-1) along transects from the core to the edge of the otolith. Individuals were from the rio Tramandaí Estuary, Brazil. The horizontal gray bands between the Ba137:Ca43 ratios of 0.05 and 0.18 indicate migration in brackish waters (see M&M).
FIGURE 1. Mugil liza, LBP 6064, 188 in An old taxonomic dilemma: the identity of the western south Atlantic lebranche mullet (Teleostei: Perciformes: Mugilidae)
FIGURE 1. Mugil liza, LBP 6064, 188 mm SL, left lateral view.
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