Find research datasets worth reusing

Shipping alters the movement and behavior of Arctic cod (B. saida), a keystone forage fish in Arctic marine ecosystems

Dataset for Ivanova et al. (2019): Shipping alters the movement and behavior of Arctic cod (B. saida), a keystone forage fish in Arctic marine ecosystems. Includes: arctic cod tagging metadata and vps locations files, and vessel activity in Resolute Bay, Nunavut, Canada for 2012.

opencc-by-4.0Dec 2022View details →

Figure 1 in New records of Monogenoidea (Platyhelminthes) from three marine fish species from the coast of Angra dos Reis, Rio de Janeiro, Brazil

Figure 1. Map of the area of new geographical records.

opencc-by-4.0Feb 2016View details →

Figure 4 in Growth and reproduction of a marine fish, Atherina boyeri Risso 1810, in a freshwater ecosystem

Figure 4. Variation of GSI for females and males of Atherina boyeri in the Hirfanlı Reservoir.

opencc-by-4.0Feb 2016View details →

Figure 3 in Growth and reproduction of a marine fish, Atherina boyeri Risso 1810, in a freshwater ecosystem

Figure 3. Length frequency of Atherina boyeri in the Hirfanlı Reservoir.

opencc-by-4.0Feb 2016View details →

Figure 2 in Growth and reproduction of a marine fish, Atherina boyeri Risso 1810, in a freshwater ecosystem

Figure 2. Age frequency of Atherina boyeri in the Hirfanlı Reservoir.

opennotspecifiedAug 2024View details →

Arctic Biodiversity: Arctic Marine Fishes (998) DwCA

Biogeography and other attributes for Arctic organisms, various sources.Meltofte, H. (ed.) 2013. Arctic Biodiversity Assessment. Status and trends in Arctic biodiversity. Conservation of Arctic Flora and Fauna, Akureyri. https://arcticbiodiversity.is/index.php/the-report/chapters/fishes

Table 3 in New species and new records of camallanid nematodes (Nematoda, Camallanidae) from marine fishes and sea snakes in New Caledonia

Table 3. Comparison of measurements of Camallanus carangis four-stage larvae from fish and reptilian hosts in New Caledonia.<table><tbody><tr><th>Host Parupeneus</th><th>Chirocentrus</th><th>Laticauda</th></tr></tbody><tbody><tr><th></th><td>indicus</td><td>dorab</td><td>saintgironsi *</td></tr><tr><th>No. of specimens</th><td>1</td><td>1</td><td>1</td></tr><tr><th>Body length (in mm)</th><td>3.13</td><td>4.12</td><td>1.31</td></tr><tr><th>Body width</th><td>136</td><td>109</td><td>122</td></tr><tr><th>Buccal capsule – length</th><td>84</td><td>105</td><td>102</td></tr><tr><th>Buccal capsule – width</th><td>69</td><td>69</td><td>90</td></tr><tr><th>No. of ridges</th><td>17</td><td>?</td><td>18</td></tr><tr><th>Basal ring – length</th><td>12</td><td>21</td><td>24</td></tr><tr><th>Basal ring – width</th><td>51</td><td>51</td><td>54</td></tr><tr><th>Length of prongs</th><td>78</td><td>123</td><td>117</td></tr><tr><th>Oesoph. cup – length</th><td>18</td><td>24</td><td>18</td></tr><tr><th>Oesoph. cup – width</th><td>21</td><td>21</td><td>21</td></tr><tr><th>Musc. oesoph. – length</th><td>435</td><td>571</td><td>517</td></tr><tr><th>Musc. oesoph. – width</th><td>63</td><td>60</td><td>45</td></tr><tr><th>Gland. oesoph. – length</th><td>394</td><td>490</td><td>435</td></tr><tr><th>Gland. oesoph. – width</th><td>72</td><td>60</td><td>45</td></tr><tr><th>Musc./gland. oesoph.</th><td>1:091</td><td>1:0.86</td><td>1:0.84</td></tr><tr><th>length ratio</th><td></td><td></td><td></td></tr><tr><th>% of buc. c. and</th><td>2</td><td>28</td><td>81</td></tr><tr><th>oesoph. of body</th><td></td><td></td><td></td></tr><tr><th>Tail</th><td>72</td><td>147</td><td>54</td></tr></tbody></table>* Sea-snake (Reptilia).

Table 2 in New species and new records of camallanid nematodes (Nematoda, Camallanidae) from marine fishes and sea snakes in New Caledonia

Table 2. Comparison of measurements of Camallanus carangis females from marine fishes in New Caledonia.<table><tbody><tr><th>Host</th><th>Atule</th><th>Carangoides</th><th>Selar</th><th>Parupeneus</th><th>Pristipomoides</th><th>Epinephelus</th></tr></tbody><tbody><tr><th></th><td>mate</td><td>dinema</td><td>crumenophthalmus</td><td>cyclostomus</td><td>filamentosus</td><td>retouti</td></tr><tr><th>No. of specimens 1 (grav.)</th><td>2 (subgr.)</td><td>3 (gr., subgr.)</td><td>2 (subgr.)</td><td>1 (subgr.)</td><td>1 (subgr.)</td></tr><tr><th>Body length (in mm)</th><td>14.93</td><td>4.75 –7.00</td><td>14.63–17.00</td><td>10.23–11.13</td><td>14.89</td><td>10.95</td></tr><tr><th>Body width</th><td>340</td><td>163–245</td><td>381–517</td><td>340–408</td><td>313</td><td>354</td></tr><tr><th>Buccal capsule – length</th><td>195</td><td>159–180</td><td>186–225</td><td>159</td><td>150</td><td>183</td></tr><tr><th>Buccal capsule – width</th><td>198</td><td>144–180</td><td>204–233</td><td>144</td><td>159</td><td>195</td></tr><tr><th>No. of ridges</th><td>32</td><td>37–40</td><td>35–50</td><td>?</td><td>32</td><td>44</td></tr><tr><th>Basal ring – length</th><td>30</td><td>27</td><td>24–36</td><td>21–24</td><td>24</td><td>30</td></tr><tr><th>Basal ring – width</th><td>111</td><td>96</td><td>108–117</td><td>96–99</td><td>90</td><td>108</td></tr><tr><th>Length of tridents</th><td>141</td><td>135</td><td>195–240</td><td>105–195</td><td>141</td><td>153</td></tr><tr><th>Oesoph. cup – length</th><td>27</td><td>24–30</td><td>30–39</td><td>33</td><td>15</td><td>36</td></tr><tr><th>Oesoph. cup – width</th><td>36</td><td>30–36</td><td>39–45</td><td>36</td><td>33</td><td>30</td></tr><tr><th>Musc. oesoph. – length</th><td>1550</td><td>721–1047</td><td>1333–1850</td><td>816–979</td><td>911</td><td>1469</td></tr><tr><th>Musc. oesoph. – width</th><td>136</td><td>90</td><td>123–177</td><td>122–136</td><td>163</td><td>122</td></tr><tr><th>Gland. oesoph. – length</th><td>1333</td><td>653–911</td><td>1156–1659</td><td>775–925</td><td>993</td><td>1156</td></tr><tr><th>Gland. oesoph. – width</th><td>136</td><td>96–99</td><td>114–190</td><td>122–163</td><td>163</td><td>136</td></tr><tr><th>Musc./gland. oesoph.</th><td>1:0.86</td><td>1:0.87–0.91</td><td>1:0.87–0.98</td><td>1:0.94–0.95</td><td>1:1.09</td><td>1:0.79</td></tr><tr><th>length ratio</th></tr><tr><th>% of buc. c. and oesoph.</th><td>21</td><td>22–40</td><td>18–25</td><td>17–19</td><td>14</td><td>26</td></tr><tr><th>of body</th></tr><tr><th>Excretory pore</th><td>1401</td><td>707–911</td><td>1591</td><td>?</td><td>?</td><td>1224</td></tr><tr><th>Vulva from ant. end (in</th><td>7.51</td><td>2.56–3.93</td><td>7.13–8.80</td><td>4.92</td><td>7.00</td><td>5.74</td></tr><tr><th>mm)</th></tr><tr><th>% of vulva of body</th><td>50</td><td>54–56</td><td>49–55</td><td>48</td><td>47</td><td>52</td></tr><tr><th>Tail</th><td>272</td><td>90–136</td><td>225</td><td>144–147</td><td>177</td><td>190</td></tr></tbody></table>

Table 1 in New species and new records of camallanid nematodes (Nematoda, Camallanidae) from marine fishes and sea snakes in New Caledonia

Table 1. Comparison of measurements of Camallanus carangis males from marine fishes in New Caledonia.<table><tbody><tr><th>Host</th><th>Atule mate</th><th>Carangoides fulvoguttatus</th><th>Cephalopholis sonnerati</th><th>Epinephelus retouti</th></tr></tbody><tbody><tr><th>No. of specimens</th><td>2</td><td>1</td><td>3</td><td>1</td></tr><tr><th>Body length (in mm)</th><td>12.17–13.67</td><td>6.90</td><td>9.93–11.32</td><td>frag. 5.40</td></tr><tr><th>Body width</th><td>299–354</td><td>218</td><td>258–326</td><td>258</td></tr><tr><th>Buccal capsule – length</th><td>165–189</td><td>162</td><td>183–186</td><td>159</td></tr><tr><th>Buccal capsule – width</th><td>159–189</td><td>156</td><td>156–183</td><td>165</td></tr><tr><th>No. of ridges</th><td>33–35</td><td>38</td><td>34–35</td><td>40</td></tr><tr><th>Basal ring – length</th><td>21–24</td><td>27</td><td>27–33</td><td>27</td></tr><tr><th>Basal ring – width</th><td>90–105</td><td>90</td><td>96–102</td><td>93</td></tr><tr><th>Length of tridents</th><td>150</td><td>150</td><td>171–219</td><td>153</td></tr><tr><th>Oesoph. cup – length</th><td>21–30</td><td>30</td><td>30–36</td><td>36</td></tr><tr><th>Oesoph. cup – width</th><td>24–33</td><td>39</td><td>36–39</td><td>30</td></tr><tr><th>Musc. oesoph. – length</th><td>1183–1414</td><td>1020</td><td>1333–1170</td><td>1102</td></tr><tr><th>Musc. oesoph. – width</th><td>122–136</td><td>81</td><td>122–136</td><td>84</td></tr><tr><th>Gland. oesoph. – length</th><td>1156–1333</td><td>857</td><td>1034–1238</td><td>1673</td></tr><tr><th>Gland. oesoph. – width</th><td>136</td><td>96</td><td>122–136</td><td>90</td></tr><tr><th>Musc./gland. oesoph. length ratio</th><td>1:0.94–0.98</td><td>1:084</td><td>1:0.88–0.93</td><td>1:0.79</td></tr><tr><th>% of buc. c. and oesoph. of body</th><td>21</td><td>30</td><td>23–24</td><td>–</td></tr><tr><th>Excretory pore</th><td>1047–1387</td><td>?</td><td>1115–1251</td><td>?</td></tr><tr><th>Right spicule</th><td>306–309</td><td>300</td><td>294–312</td><td>–</td></tr><tr><th>Tail</th><td>75–81</td><td>102</td><td>84–117</td><td>–</td></tr></tbody></table>

opencc-zeroMar 2020View details →

It's a wormy world: Meta-analysis reveals several decades of change in the global abundance of the parasitic nematodes Anisakis spp. and Pseudoterranova spp. in marine fishes and invertebrates

The Anthropocene has brought substantial change to ocean ecosystems, but whether this age will bring more or less marine disease is unknown. In recent years, the accelerating tempo of epizootic and zoonotic disease events has made it seem as if disease is on the rise. Is this apparent increase in disease due to increased observation and sampling effort, or to an actual rise in the abundance of parasites and pathogens? We examined the literature to track long-term change in the abundance of two parasitic nematode genera with zoonotic potential: Anisakis spp. and Pseudoterranova spp. These anisakid nematodes cause the disease anisakidosis and are transmitted to humans in undercooked and raw marine seafood. A total of 123 papers published between 1967 and 2017 met our criteria for inclusion, from which we extracted 755 host–parasite–location–year combinations. Of these, 69.7% concerned Anisakis spp. and 30.3% focused on Pseudoterranova spp. Meta-regression revealed an increase in Anisakis spp. abundance (average number of worms/ fish) over a 53 year period from 1962 to 2015 and no significant change in Pseudoterranova spp. abundance over a 37 year period from 1978 to 2015. Standardizing changes to the period of 1978–2015, so that results are comparable between genera, we detected a significant 283-fold increase in Anisakis spp. abundance and no change in the abundance of Pseudoterranova spp. This increase in Anisakis spp. abundance may have implications for human health, marine mammal health, and fisheries profitability.

opencc-zeroNov 2019View details →

A Paleocene (Danian) marine osteoglossid (Teleostei, Osteoglossomorpha) from the Nuussuaq Basin of Greenland, with a brief review of Palaeogene marine bonytongue fishes

The early Palaeogene represents a key interval in the evolution of modern marine fish faunas. Together with the first appearances of many familiar fish lineages characteristic of contemporary marine environments, early Palaeogene marine deposits worldwide feature the occurrence of osteoglossid bonytongues. Their presence in marine rocks is surprising, as these fishes are strictly associated with freshwater environments in modern settings and other parts of the fossil record. Despite its possible relevance to faunal recovery after the K–Pg extinction, this marine osteoglossid radiation is relatively understudied. Here we describe an osteoglossid specimen from marine Danian deposits of western Greenland (Eqalulik Formation, northern Nuussuaq Peninsula). It consists of disarticulated cranial, pectoral and vertebral material belonging to a relatively large-bodied predator, similar to the widespread †Brychaetus but with some distinctive features. This specimen expands the geographic range of extinct osteoglossids to the Arctic and represents one of the earliest records of this group in marine deposits. We review other fossil occurrences of marine osteoglossids, highlighting temporal and biogeographic patterns that characterize their rise, diversification and sudden disappearance in the middle Eocene. It is likely that the transition from freshwater to marine environments occurred around the K–Pg boundary, possibly related to ecological replacement of predatory fish lineages that went extinct at the end of the Cretaceous. Further study of the Eqalulik Formation fauna could yield additional insight into the consequences of the end-Cretaceous extinction on marine fish evolution and on the assembly of modern marine faunas.

opencc-by-4.0Apr 2009View details →

Figure 1 in Cryptic speciation at organic-rich marine habitats: a new bacteriovore annelid from whale-fall and fish farms in the North-East Atlantic

Figure 1. Map showing collection sites in Sweden and Norway for the new species.

opencc-zeroAug 2022View details →

Ecological and behavioural drivers of offspring size in marine teleost fishes

Aim: Our aim was to evaluate the role of ecological and life-history factors in shaping global variation in offspring size in a marine clade with a diverse range of parental care behaviours. Location: Global. Time period: Data sourced from literature published from 1953 until 2019. Major taxa studied: Marine teleost fishes. Methods: We compiled a species-level dataset of egg and hatchling size for 1,639 species of marine fish across 45 orders. We used Bayesian phylogenetic mixed models to evaluate the relationship between offspring size and environmental factors (i.e., mean temperature, chlorophyll-a and dissolved oxygen content together with their annual variation), as well as latitude, reproductive strategy, parental body size and fecundity. We also tested long-standing hypotheses about the co-evolution of offspring size and the presence of parental care in BayesTraits. Results: After controlling for parental body size and phylogenetic history, we find that increased egg size is associated with colder and oxygen-rich waters, while hatch size further depends on food supply and the reproductive strategy exhibited by the species. Irrespective of the initial investment in egg size, species with parental care or demersal egg development yield larger hatchlings compared to pelagic spawners. We also demonstrate that hatch size has co-evolved with advanced forms of care in association with parental body but fail to find a relationship with other types of care. Main conclusions: Our study shows that parental care behaviours, together with environmental context, influence the evolution of classic life-history trade-offs on a global scale. While the initial investment in eggs is driven primarily by temperature and oxygen content, hatchling size also reflects the impact of care an offspring has received throughout development. In support of the 'offspring-first' hypothesis, we find that an increase in hatch size drives the evolution of advanced care provision.

opencc-zeroDec 2022View details →

C and N stable isotope ratios in fishes from marine protected areas and areas open to fishing

Here, we assess whether fishery exploitation affects the trophic structure of carnivorous fishes. We censused fishes and analysed the stable isotope ratios of C and N of species targeted by fishermen in areas open to fishing and marine protected areas in the Mediterranean Sea and the north-eastern Atlantic Ocean. Results demonstrated a major impact of fishing on the biomass and the size structure of nektobenthic carnivorous fishes. However, those changes did not modify the diversity of the trophic resources used by the assemblage, the pattern of resource partitioning between species or the degree of trophic redundancy. These results add to recent evidence suggesting that marine protected areas implemented in fished seascapes may fail to restore the original structure of the food webs that once existed in pre-fished ecosystems, because regional decimation and extinction of highly mobile predators prevents recovering the original diversity of predators at local scales, even at no-take areas. If so, more strict local fishing regulations are unlikely to restore the original diversity of high trophic level carnivores and restoration goals should be reframed in terms of an objective that is less unrealistic than restoring the pre-fished condition while still recovering aspects of the historical trophic structure.

opencc-zeroFeb 2023View details →

Data for: Seasonal variability in resilience of a coral reef fish to marine heatwaves and hypoxia

Climate change projections indicate more frequent and severe tropical marine heatwaves (MHWs) and accompanying hypoxia year-round. However, most studies have focused on peak summer peak conditions under the assumption that annual maximum temperatures will induce the greatest physiological consequences. This study challenges this idea by characterizing seasonal MHWs (i.e., mean, maximum, and cumulative intensities, durations, heating rates, and mean annual occurrence) and comparing metabolic traits (i.e., standard metabolic rate (SMR), Q10 of SMR, maximum metabolic rate (MMR), aerobic scope, and critical oxygen tension (Pcrit)) of winter- and summer-acclimatized convict tang (Acanthurus triostegus) to the combined effects of MHWs and hypoxia. Fish were exposed to one of six MHW treatments with seasonally varying maximum intensities (winter: 24.5, 26.5, 28.5°C; summer: 28.5, 30.5, 32.5°C), representing past and future MHWs under IPCC projections (i.e., +0, +2, +4°C). Surprisingly, MHW characteristics did not significantly differ between seasons, yet SMR was more sensitive to winter MHWs (mean Q10 = 2.92) than summer MHWs (mean Q10 = 1.81), despite higher absolute summer temperatures. Concurrently, MMR increased similarly among winter +2°C and +4°C treatments (i.e., 26.5, 28.5°C) and all summer MHW treatments, suggesting a ceiling for maximal MMR increase. Aerobic scope did not significantly differ between seasons nor among MHW treatments. While mean Pcrit did not significantly vary between seasons, warming of +4°C during winter (i.e., 28.5°C) significantly increased Pcrit relative to the winter control group. Contrary to the idea of increased sensitivity to MHWs during the warmest time of year, our results reveal heightened sensitivity to the deleterious effects of winter MHWs, and that seasonal acclimatization to warmer summer conditions may bolster metabolic resilience to warming and hypoxia. Consequently, physiological sensitivity to MHWs and hypoxia may extend across larger parts of the year than previously expected, emphasizing the importance of evaluating climate change impacts during cooler seasons when essential fitness-related traits such as reproduction occur in many species.

opencc-by-4.0Dec 2007View details →

Fig. 3 in A new genus and species of marine fish leech (Annelida: Hirudinea: Piscicolidae) from South Africa

Fig. 3. Male gonopores, transverse section in clitellum region. Abbreviation: Mp – male gonopore.

opencc-zeroMar 2023View details →

Data for: Is the hyoid a constraint on innovation? A study in convergence driving feeding in fish-shaped marine tetrapods

The hyoid apparatus is essential for underwater feeding in marine tetrapods, but it is unclear whether this complex has evolved as convergently as other traits, such as dentition or locomotion. Here we compare the ossified hyoid elements in ophthalmosaurid ichthyosaurs and odontocete cetaceans, two groups with an overall similar body shape, to understand whether the hyoid elements show any signs of convergence in the context of feeding. We examined three types of data (size, morphology, and internal bone microstructure) in ophthalmosaurid and odontocete taxa in which these elements are preserved. Our data show that ichthyosaurs never experienced a shift in feeding mode, which might indicate that their hyoid apparatus never adapted to suction feeding. Also, the internal microstructure of the two animal groups differs, where the odontocetes have an overall less compact structure, ophthalmosaurid ichthyosaurs have cancellous inner cones in an outer, more compact sheath. These differences are likely explained as biomechanical adaptations to different feeding modes. Thus, the hyoid changed less, and acted more as a constraint for feeding innovation in ichthyosaurs compared to cetaceans, and through a much longer time span (over 150 million years).

opencc-zeroMar 2023View details →

Data from: Monitoring temporal and spatial trends of illegal and legal fishing in Canada's marine conservation areas using vessel tracking datasets

Expansion of marine conservation areas (CA) necessitates resource-efficient and achievable strategies for monitoring and evaluation of ongoing fishing activity at national levels. To demonstrate and explore such a strategy, we conducted the first extensive analysis of fishing activity within Canada's static, geographically defined marine CAs with fishing regulations (n = 264 areas). We used eight years of Automatic Identification System data to estimate fishing effort across three oceans and conducted temporal and spatial comparisons specific to each CA's regulations and enactment date. We addressed questions on CA effectiveness, fishing displacement, fishing the line behavior, and relationships between fishing activity and spatial CA attributes. We estimated 22,000 hours of fishing activity within CAs after enactments, 22% of which was identified as illegal. CA effectiveness appeared to be lowest for Atlantic CAs based on illegal fishing effort density within CAs. Fishing displacement and fishing the line was generally not apparent as buffer areas around CAs tended to already have higher fishing effort prior to enactments. CA effectiveness and responses to CAs varied considerably, as was visualized using timeseries plots and maps developed for each CA. Our evaluation of a nation's full suite of CAs provides managers with a foundation and approach for continued monitoring and reporting.

opencc-zeroDec 2022View details →

Data from: Internal injuries in marine fishes caught in beam trawls using electrical versus mechanical stimulations

To improve the ecological and economic sustainability in the Dutch beam trawl fishery, tickler chains were replaced by electrical pulse stimulation to drive sole (Solea solea) out of the seabed. Because electrical stimulation may cause internal injuries, we quantified this risk by sampling fish species from commercial beam trawlers and recording spinal injuries and haemorrhages from X-radiographs and autopsy. To distinguish mechanically and electrical-pulse-induced injuries, we compared injuries in ten species sampled from pulse (PUL) and tickler-chain (TCK) trawlers and four species sampled from PUL trawlers with the stimulus switched on or off. Co-occurrence of a major spinal injury and major haemorrhage at the same location was only observed in PUL samples, and were frequently (40%) observed in cod (Gadus morhua) and in low numbers (0–2%) in whiting (Merlangius merlangus), grey gurnard (Eutrigla gurnardus), and greater sandeel (Hyperoplus lanceolatus), but not in flatfishes and other species. In cod, injury occurrence correlated with fish length, with lower probabilities for small fish. Major spinal injury or major haemorrhage occurrence in PUL (range: <1–16%) was lower than in TCK (range: <1–42%) in eight of the ten species studied. Population-level consequences of pulse-induced injuries are considered negligible.