Academic literature on the topic 'Deep-sea fisheries – Southern hemisphere'
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Journal articles on the topic "Deep-sea fisheries – Southern hemisphere"
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Yen, Kuo-Wei, and Chia-Hsiang Chen. "Research Gap Analysis of Remote Sensing Application in Fisheries: Prospects for Achieving the Sustainable Development Goals." Remote Sensing 13, no. 5 (2021): 1013. http://dx.doi.org/10.3390/rs13051013.
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Remote sensing (RS) technology, which can facilitate the sustainable management and development of fisheries, is easily accessible and exhibits high performance. It only requires the collection of sufficient information, establishment of databases and input of human and capital resources for analysis. However, many countries are unable to effectively ensure the sustainable development of marine fisheries due to technological limitations. The main challenge is the gap in the conditions for sustainable development between developed and developing countries. Therefore, this study applied the Web of Science database and geographic information systems to analyze the gaps in fisheries science in various countries over the past 10 years. Most studies have been conducted in the offshore marine areas of the northeastern United States of America. In addition, all research hotspots were located in the Northern Hemisphere, indicating a lack of relevant studies from the Southern Hemisphere. This study also found that research hotspots of satellite RS applications in fisheries were mainly conducted in (1) the northeastern sea area in the United States, (2) the high seas area of the North Atlantic Ocean, (3) the surrounding sea areas of France, Spain and Portugal, (4) the surrounding areas of the Indian Ocean and (5) the East China Sea, Yellow Sea and Bohai Bay sea areas to the north of Taiwan. A comparison of publications examining the three major oceans indicated that the Atlantic Ocean was the most extensively studied in terms of RS applications in fisheries, followed by the Indian Ocean, while the Pacific Ocean was less studied than the aforementioned two regions. In addition, all research hotspots were located in the Northern Hemisphere, indicating a lack of relevant studies from the Southern Hemisphere. The Atlantic Ocean and the Indian Ocean have been the subjects of many local in-depth studies; in the Pacific Ocean, the coastal areas have been abundantly investigated, while offshore local areas have only been sporadically addressed. Collaboration and partnership constitute an efficient approach for transferring skills and technology across countries. For the achievement of the sustainable development goals (SDGs) by 2030, research networks can be expanded to mitigate the research gaps and improve the sustainability of marine fisheries resources.
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Jiménez, Sebastián, Andrés Domingo, Alejandro Brazeiro, et al. "Sexual size dimorphism, spatial segregation and sex-biased bycatch of southern and northern royal albatrosses in pelagic longline fisheries." Antarctic Science 29, no. 2 (2016): 147–54. http://dx.doi.org/10.1017/s0954102016000493.
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AbstractBycatch in longline fisheries is a major contributor to the global decline of albatrosses. Sexual segregation at sea often leads to unequal overlap with different fisheries, resulting in sex-biased bycatch, exacerbating the impact on a population level. In great albatrosses (Diomedea spp.), males (the larger sex) tend to spend more time at higher latitudes than females, attributed to competitive exclusion or differences in flight performance mediated by the pronounced sexual size dimorphism (SSD). Consequently, larger numbers of females are bycaught in pelagic longline fisheries in subtropical and temperate areas. Although this has been shown for Diomedea exulans, it has not been confirmed for all great albatross species. Here we examined the degree of SSD and developed discriminant functions to determine species and sex in D. epomophora and D. sanfordi; species that are often killed in several fisheries in the Southern Hemisphere. Based on a large sample of albatrosses bycaught off Uruguay, both species showed substantial SSD. Discriminant functions assigned species and sex to otherwise indeterminate individuals with 90–100% accuracy. Based on all birds identified (n=128), bycatch in the pelagic longline fishery was female-biased, indicating sexual segregation at sea. The discriminant functions presented enable species and sex to be identified, providing critical data for future bycatch assessments.
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Lehodey, P., J. Alheit, M. Barange, et al. "Climate Variability, Fish, and Fisheries." Journal of Climate 19, no. 20 (2006): 5009–30. http://dx.doi.org/10.1175/jcli3898.1.
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Abstract Fish population variability and fisheries activities are closely linked to weather and climate dynamics. While weather at sea directly affects fishing, environmental variability determines the distribution, migration, and abundance of fish. Fishery science grew up during the last century by integrating knowledge from oceanography, fish biology, marine ecology, and fish population dynamics, largely focused on the great Northern Hemisphere fisheries. During this period, understanding and explaining interannual fish recruitment variability became a major focus for fisheries oceanographers. Yet, the close link between climate and fisheries is best illustrated by the effect of “unexpected” events—that is, nonseasonal, and sometimes catastrophic—on fish exploitation, such as those associated with the El Niño–Southern Oscillation (ENSO). The observation that fish populations fluctuate at decadal time scales and show patterns of synchrony while being geographically separated drew attention to oceanographic processes driven by low-frequency signals, as reflected by indices tracking large-scale climate patterns such as the Pacific decadal oscillation (PDO) and the North Atlantic Oscillation (NAO). This low-frequency variability was first observed in catch fluctuations of small pelagic fish (anchovies and sardines), but similar effects soon emerged for larger fish such as salmon, various groundfish species, and some tuna species. Today, the availability of long time series of observations combined with major scientific advances in sampling and modeling the oceans’ ecosystems allows fisheries science to investigate processes generating variability in abundance, distribution, and dynamics of fish species at daily, decadal, and even centennial scales. These studies are central to the research program of Global Ocean Ecosystems Dynamics (GLOBEC). This review presents examples of relationships between climate variability and fisheries at these different time scales for species covering various marine ecosystems ranging from equatorial to subarctic regions. Some of the known mechanisms linking climate variability and exploited fish populations are described, as well as some leading hypotheses, and their implications for their management and for the modeling of their dynamics. It is concluded with recommendations for collaborative work between climatologists, oceanographers, and fisheries scientists to resolve some of the outstanding problems in the development of sustainable fisheries.
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Meynecke, Jan-Olaf, Mark Grubert, and Jonathan Gillson. "Giant mud crab (Scylla serrata) catches and climate drivers in Australia - a large scale comparison." Marine and Freshwater Research 63, no. 1 (2012): 84. http://dx.doi.org/10.1071/mf11149.
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Patterns in the Southern Oscillation Index (SOI) affect the life history of many aquatic organisms in the southern hemisphere. We examined the effect of this phenomenon and other factors (i.e. rainfall, river flow and sea surface temperature, SST) on the commercial harvest of the giant mud crab (Scylla serrata) in Australia, given the large inter-annual variations in the catch of this species over the last 15 years, particularly in the north. Regression models were applied to concurrent environmental and catch data for giant mud crab caught from 29 catchments that provided a combined harvest of >20 000 tonnes. Non-metric multidimensional scaling (nMDS) was also used to explore potential regional differences in catch trends. A combination of SOI, SST and rainfall/river flow explained 30–70% of the variability in commercial catches, with mean summer temperature being most influential at higher latitudes. The nMDS revealed distinct groupings of river systems that coincided with biogeographic regions. This work highlights the importance of climatic events on the harvest of giant mud crabs and reinforces the need to adopt a bioregional approach when assessing the performance of fisheries targeting this species.
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Wakefield, Corey B., Stephen J. Newman, and Brett W. Molony. "Age-based demography and reproduction of hapuku, Polyprion oxygeneios, from the south coast of Western Australia: implications for management." ICES Journal of Marine Science 67, no. 6 (2010): 1164–74. http://dx.doi.org/10.1093/icesjms/fsq021.
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Abstract Wakefield, C. B., Newman, S. J., and Molony, B. W. 2010. Age-based demography and reproduction of hapuku, Polyprion oxygeneios, from the south coast of Western Australia: implications for management. – ICES Journal of Marine Science, 67: 1164–1174. The hapuku, Polyprion oxygeneios, inhabits deep (>100 m) continental slope waters of Western Australia. In all, 1352 P. oxygeneios were collected from the waters along the south coast of Western Australia (ca. 35°S) from 2004 to 2008. The species is gonochoristic, and spawns during the austral winter (May–September). Ages were estimated from counts of opaque zones from thin-sectioned sagittal otoliths. Classification analysis of the outer margin of sectioned otoliths indicated that a single opaque zone is deposited annually. Female P. oxygeneios (n = 630; 535–1114 mm total length, TL) ranged in age from 2 to 35 years and males (n = 691; 521–1004 mm TL) from 2 to 52 years. von Bertalanffy growth models for male and female P. oxygeneios were statistically, but not biologically, different (<5% difference in mean and estimated lengths-at-age). Estimates of the lengths and ages at which 50% of the females and males in the population reached sexual maturity were 760 and 702 mm TL and 7.1 and 6.8 years. The instantaneous rate of natural mortality (M) was estimated to be 0.09. Estimates of the instantaneous rate of fishing mortality (F) were low (0.01–0.05). Harvest rates in 2005 and 2006 were close to estimated sustainable levels. Monitoring of any future increases in catch and effort in continental slope waters in both State- and Commonwealth-managed fisheries is required in order to assess impacts to stock sustainability. Sustainable management would also benefit from improved understanding of possible pan-oceanic recruitment of the species among southern hemisphere populations.
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Cheon, Woo Geun, Chang-Bong Cho, Arnold L. Gordon, Young Ho Kim, and Young-Gyu Park. "The Role of Oscillating Southern Hemisphere Westerly Winds: Southern Ocean Coastal and Open-Ocean Polynyas." Journal of Climate 31, no. 3 (2018): 1053–73. http://dx.doi.org/10.1175/jcli-d-17-0237.1.
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Abstract An oscillation in intensity of the Southern Hemisphere westerly winds is a major characteristic of the southern annular mode. Its impact upon the sea ice–ocean interactions in the Weddell and Ross Seas is investigated by a sea ice–ocean general circulation model coupled to an energy balance model for three temporal scales and two amplitudes of intensity. It is found that the oscillating wind forcing over the Southern Ocean plays a significant role both in regulating coastal polynyas along the Antarctic margins and in triggering open-ocean polynyas. The formation of coastal polynya in the western Weddell and Ross Seas is enhanced with the intensifying winds, resulting in an increase in the salt flux into the ocean via sea ice formation. Under intensifying winds, an instantaneous spinup within the Weddell and Ross Sea cyclonic gyres causes the warm deep water to upwell, triggering open-ocean polynyas with accompanying deep ocean convection. In contrast to coastal polynyas, open-ocean polynyas in the Weddell and Ross Seas respond differently to the wind forcing and are dependent on its period. That is, the Weddell Sea open-ocean polynya occurs earlier and more frequently than the Ross Sea open-ocean polynya and, more importantly, does not occur when the period of oscillation is sufficiently short. The strong stratification of the Ross Sea and the contraction of the Ross gyre due to the southward shift of Antarctic Circumpolar Current fronts provide unfavorable conditions for the Ross Sea open-ocean polynya. The recovery time of deep ocean heat controls the occurrence frequency of the Weddell Sea open-ocean polynya.
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Bruce, AJ. "Thaumastochelopsis wardi, gen. et. sp. nov., a new blind deep-sea lobster from the coral sea (Crustacea : Decapoda : Nephropidea)." Invertebrate Systematics 2, no. 7 (1988): 903. http://dx.doi.org/10.1071/it9880903.
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The nephropid lobster family Thaumastochelidae has so far only been recorded from the Northern Hemisphere in the central Atlantic Ocean and in Japanese waters, where two species of Thaumastocheles, the only genus of the family, are known. The discovery of a new genus and species in the Coral Sea is the first occurrence in the Southern Hemisphere and provides additional knowledge of this littleknown family. A modification of the diagnosis of the family is made to include the new genus, which has reduced but mobile eyes instead of obsolete fused eyestalks as in Thaumastocheles. The new lobster, Thaumastochelopsis wardi, gen. et sp. nov., was obtained from a depth of 452 m.
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Rhein, Monika, Dagmar Kieke, and Reiner Steinfeldt. "Advection of North Atlantic Deep Water from the Labrador Sea to the southern hemisphere." Journal of Geophysical Research: Oceans 120, no. 4 (2015): 2471–87. http://dx.doi.org/10.1002/2014jc010605.
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Stott, L., A. Timmermann, and R. Thunell. "Southern Hemisphere and Deep-Sea Warming Led Deglacial Atmospheric CO2 Rise and Tropical Warming." Science 318, no. 5849 (2007): 435–38. http://dx.doi.org/10.1126/science.1143791.
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Cheon, Woo Geun, and Jong-Seong Kug. "The Role of Oscillating Southern Hemisphere Westerly Winds: Global Ocean Circulation." Journal of Climate 33, no. 6 (2020): 2111–30. http://dx.doi.org/10.1175/jcli-d-19-0364.1.
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AbstractIn the framework of a sea ice–ocean general circulation model coupled to an energy balance atmospheric model, an intensity oscillation of Southern Hemisphere (SH) westerly winds affects the global ocean circulation via not only the buoyancy-driven teleconnection (BDT) mode but also the Ekman-driven teleconnection (EDT) mode. The BDT mode is activated by the SH air–sea ice–ocean interactions such as polynyas and oceanic convection. The ensuing variation in the Antarctic meridional overturning circulation (MOC) that is indicative of the Antarctic Bottom Water (AABW) formation exerts a significant influence on the abyssal circulation of the globe, particularly the Pacific. This controls the bipolar seesaw balance between deep and bottom waters at the equator. The EDT mode controlled by northward Ekman transport under the oscillating SH westerly winds generates a signal that propagates northward along the upper ocean and passes through the equator. The variation in the western boundary current (WBC) is much stronger in the North Atlantic than in the North Pacific, which appears to be associated with the relatively strong and persistent Mindanao Current (i.e., the southward flowing WBC of the North Pacific tropical gyre). The North Atlantic Deep Water (NADW) formation is controlled by salt advected northward by the North Atlantic WBC.
Dissertations / Theses on the topic "Deep-sea fisheries – Southern hemisphere"
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Andrews, Allen Hia. "Lead-radium dating of two deep-water fishes from the southern hemisphere, Patagonian toothfish (Dissostichus eleginoides) and Orange Roughy (Hoplostethus atlanticus)." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1005140.
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Patagonian toothfish (Dissostichus eleginoides) or "Chilean sea bass" support a valuable and controversial fishery, but the life history is little known and longevity estimates range from ~20 to more than 40 or 50 yr. In this study, lead-radium dating provided validated age estimates from juveniles to older adults, supporting the use of otoliths as accurate indicators of age. The oldest age groups were near 30 yr, which provided support for age estimates exceeding 40 or 50 yr from grow zone counts in otolith sections. Hence, scale reading, which rarely exceeds 20 years, has the potential for age underestimation. Lead-radium dating revealed what may be minor differences in age interpretation between two facilities and findings may provide an age-validated opportunity for the CCAMLR Otolith Network to reassess otolith interpretations. Orange roughy (Hoplostethus atlanticus) support a major deep-sea fishery and stock assessments often depend on age analyses, but lifespan estimates range from ~20 to over 100 yr and validation of growth zone counts remained unresolved. An early application of lead-radium dating supported centenarian ages, but the findings were met with disbelief and some studies have attempted to discredit the technique and the long lifespan. In this study, an improved lead-radium dating technique used smaller samples than previously possible and circumvented assumptions that were previously necessary. Lead-radium dating of otolith cores, the first few years of growth, provided ratios that correlated well with the ingrowth curve. This provided robust support for age estimates from otolith thin sections. Use of radiometric ages as independent age estimates indicated the fish in the oldest group were at least 93 yr. Lead-radium dating has validated a centenarian lifespan for orange roughy. To date, radium-226 has been measured in otoliths of 39 fish species ranging from the northern Pacific and Atlantic Oceans to the Southern Ocean. In total, 367 reliable radium-226 measurements were made in 36 studies since the first lead-radium dating study on fish in 1982. The activity of radium-226 measurements ranged over 3 orders of magnitude (<0.001 to >1.0 dpm.g⁻¹). An analysis revealed ontogenetic differences in radium-226 uptake that may be attributed to changes in habitat or diet. Radiometric age from otolith core studies was used to describe a radium-226 uptake time-series for some species, which revealed interesting patterns over long periods. This synopsis provides information on the uptake of radium-226 to otoliths from an environmental perspective, which can be used as a basis for future studies.
Books on the topic "Deep-sea fisheries – Southern hemisphere"
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Food and Agriculture Organization of the United Nations. Ad Hoc Meeting on Management of Deepwater Fisheries Resources of the Southern Indian Ocean. Report of the Ad Hoc Meeting on Management of Deepwater Fisheries Resources of the Southern Indian Ocean: Swakopmund, Namibia, 30 May-1 June 2001. Agriculture Organization of the United Nations, 2001.
Find full textBook chapters on the topic "Deep-sea fisheries – Southern hemisphere"
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"Grenadiers of the World Oceans: Biology, Stock Assessment, and Fisheries." In Grenadiers of the World Oceans: Biology, Stock Assessment, and Fisheries, edited by N. J. King and I. G. Priede. American Fisheries Society, 2008. http://dx.doi.org/10.47886/9781934874004.ch11.
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<em>Abstract.</em>—The abyssal grenadier <em>Coryphaenoides armatus </em>(Hector 1875), family Macrouridae, is a benthopelagic deep-sea species with a depth range of 282–5,180 m, with most observations and captures at depths of 2,500 m and deeper. It is one of the most abundant grenadier species in the world’s oceans but is absent from the Mediterranean Sea, Arctic Ocean, Indian Ocean north of 45°S, and has not yet been recorded from the Southern Ocean south of the Antarctic Polar Front. Typical total lengths range from 20 to 80 cm and the maximum recorded is 102 cm. Dietary items include mesopelagic fishes and cephalopods, and benthic items such as crustaceans and bivalves. The abyssal grenadier is well documented as an opportunistic scavenger and this propensity has been used to attract individuals to bait within view of submersibles and underwater camera systems to make <em>in situ </em>observations of behavior. Baited cameras have been in use to observe deep-sea scavengers since the late 1960s, with the first confirmed observation of the abyssal grenadier in 1971. More recently, baited photographic autonomous landers have been used to gain data on respiration rates, size frequency, and swimming velocity. In addition, models have been developed and refined to estimate local densities and to quantify the number of fish present at a food fall and their staying time at bait. This ultimately means that baited-camera-derived abundance estimates can be produced, and that the numbers of scavenging grenadiers and how long they remain at a small food fall can be linked to the productivity of the overlying surface waters.
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"Grenadiers of the World Oceans: Biology, Stock Assessment, and Fisheries." In Grenadiers of the World Oceans: Biology, Stock Assessment, and Fisheries, edited by N. J. King and I. G. Priede. American Fisheries Society, 2008. http://dx.doi.org/10.47886/9781934874004.ch11.
Full textAbstract:
<em>Abstract.</em>—The abyssal grenadier <em>Coryphaenoides armatus </em>(Hector 1875), family Macrouridae, is a benthopelagic deep-sea species with a depth range of 282–5,180 m, with most observations and captures at depths of 2,500 m and deeper. It is one of the most abundant grenadier species in the world’s oceans but is absent from the Mediterranean Sea, Arctic Ocean, Indian Ocean north of 45°S, and has not yet been recorded from the Southern Ocean south of the Antarctic Polar Front. Typical total lengths range from 20 to 80 cm and the maximum recorded is 102 cm. Dietary items include mesopelagic fishes and cephalopods, and benthic items such as crustaceans and bivalves. The abyssal grenadier is well documented as an opportunistic scavenger and this propensity has been used to attract individuals to bait within view of submersibles and underwater camera systems to make <em>in situ </em>observations of behavior. Baited cameras have been in use to observe deep-sea scavengers since the late 1960s, with the first confirmed observation of the abyssal grenadier in 1971. More recently, baited photographic autonomous landers have been used to gain data on respiration rates, size frequency, and swimming velocity. In addition, models have been developed and refined to estimate local densities and to quantify the number of fish present at a food fall and their staying time at bait. This ultimately means that baited-camera-derived abundance estimates can be produced, and that the numbers of scavenging grenadiers and how long they remain at a small food fall can be linked to the productivity of the overlying surface waters.