technology evolution and advances in fisheries acoustics
... from different targets interfere with each other and produce a combined complex quantity (phase and amplitude), the estimated target location is similar to the geometric center of the insonified targets (i.e. the mean phase reflects the “center of mass”). However, in some cases, the inferred locatio ...
... from different targets interfere with each other and produce a combined complex quantity (phase and amplitude), the estimated target location is similar to the geometric center of the insonified targets (i.e. the mean phase reflects the “center of mass”). However, in some cases, the inferred locatio ...
14.2 Ocean Floor Features
... The mid-ocean ridge is found near the center of most ocean basins. It is an interconnected system of underwater mountains that have developed on newly formed ocean crust. This system is the longest topographic feature on Earth’s surface. It exceeds 70,000 kilometers in length. The mid-ocean ridge wi ...
... The mid-ocean ridge is found near the center of most ocean basins. It is an interconnected system of underwater mountains that have developed on newly formed ocean crust. This system is the longest topographic feature on Earth’s surface. It exceeds 70,000 kilometers in length. The mid-ocean ridge wi ...
info sheet - Mundus maris
... the primary production in the photic zone. That happens when the water is shallow, if deep mineral-rich water “wells up” along the western coasts of the continents or when whales feeding in deep waters in polar seas defaecate at the surface, thus fertilising surface waters and nurture a robust food ...
... the primary production in the photic zone. That happens when the water is shallow, if deep mineral-rich water “wells up” along the western coasts of the continents or when whales feeding in deep waters in polar seas defaecate at the surface, thus fertilising surface waters and nurture a robust food ...
Exploration Technologies for the Utilization of Ocean Floor Resources
... of cobalt-rich crust very high. In the adjacent waters within 200 nautical miles, manganese crust and hydrothermal ore deposits exist in a large quantity, but these deposits contain less cobalt and platinum. The area where such marine resources exist sprawls beyond limits of Japan’s EEZ as shown in ...
... of cobalt-rich crust very high. In the adjacent waters within 200 nautical miles, manganese crust and hydrothermal ore deposits exist in a large quantity, but these deposits contain less cobalt and platinum. The area where such marine resources exist sprawls beyond limits of Japan’s EEZ as shown in ...
Climate change and reduced ice cover significantly impact the
... Alaska’s Bering Sea fisheries provide nearly half of the seafood consumed in the U.S., forming a powerful economic engine for fishing communities and the core of an ocean-based subsistence lifestyle. Whales, seals, and seabirds travel from afar to feed and mate here. Fur seals breed on island rooker ...
... Alaska’s Bering Sea fisheries provide nearly half of the seafood consumed in the U.S., forming a powerful economic engine for fishing communities and the core of an ocean-based subsistence lifestyle. Whales, seals, and seabirds travel from afar to feed and mate here. Fur seals breed on island rooker ...
Summary and Conclusion
... or heavy mortality of zooplankton occurs when they are exposed to the bloom. Reduced zooplankton grazing pressure during massive red tide could be attributed to the dense population of HAB species, and also to the production of grazing inhibiting compounds or toxins which either deter grazers or let ...
... or heavy mortality of zooplankton occurs when they are exposed to the bloom. Reduced zooplankton grazing pressure during massive red tide could be attributed to the dense population of HAB species, and also to the production of grazing inhibiting compounds or toxins which either deter grazers or let ...
Copepod carcasses in the ocean. I. Over seamounts
... carcasses. The samples from the shallowest depths (sampled last) of both tows had the highest percentage of carcasses (Fig. 3). Similarly, the depth distribution of carcasses at Fieberling Guyot (Fig. 4) shows that the percentage of carcasses in the deepest samples (sampled first, thus in the cod en ...
... carcasses. The samples from the shallowest depths (sampled last) of both tows had the highest percentage of carcasses (Fig. 3). Similarly, the depth distribution of carcasses at Fieberling Guyot (Fig. 4) shows that the percentage of carcasses in the deepest samples (sampled first, thus in the cod en ...
The presence of the Harbour Porpoise (Phocoena
... The animals occasionally surface with a vigorous vertical motion, causing a splash. The small size of the animals and unobtrusive respiration sequence, makes it quite difficult to spot a Harbour porpoise. Also, the animals are known to be quite shy and avoid boats. [Cetacean Research and Rescue Unit ...
... The animals occasionally surface with a vigorous vertical motion, causing a splash. The small size of the animals and unobtrusive respiration sequence, makes it quite difficult to spot a Harbour porpoise. Also, the animals are known to be quite shy and avoid boats. [Cetacean Research and Rescue Unit ...
Benthic invertebrate communities
... particular, is more or less entirely controlled by the presence or absence of hypoxia/anoxia. Current evidence suggests that the spatial and temporal extent of oxygen deficiency has increased over the past decades. In the light of historical work, it is also likely that reference conditions defined ...
... particular, is more or less entirely controlled by the presence or absence of hypoxia/anoxia. Current evidence suggests that the spatial and temporal extent of oxygen deficiency has increased over the past decades. In the light of historical work, it is also likely that reference conditions defined ...
The Oceans - Academic Program Pages
... brunt of tsunamis—great waves generated by earthquakes. Traveling much faster than any of the Pacific’s normal currents (right), tsunamis cross the open ocean at the speed of a modern jet. Yet they cannot be seen or felt far from land: only when tsunamis reach the shallows do they build into monstro ...
... brunt of tsunamis—great waves generated by earthquakes. Traveling much faster than any of the Pacific’s normal currents (right), tsunamis cross the open ocean at the speed of a modern jet. Yet they cannot be seen or felt far from land: only when tsunamis reach the shallows do they build into monstro ...
Murugan and Durgekar - Fishing Down Marine Food Webs
... the mid-1990s, there had been an increase in the number of complaints from traditional fishermen regarding exploitation of fisheries by the trawlers. To address this conflict, the government had introduced the Tamil Nadu Marine Fisheries Act in 1983. The primary objective of this Act was to regulate ...
... the mid-1990s, there had been an increase in the number of complaints from traditional fishermen regarding exploitation of fisheries by the trawlers. To address this conflict, the government had introduced the Tamil Nadu Marine Fisheries Act in 1983. The primary objective of this Act was to regulate ...
Plankton 2015 - State of Australia`s oceans
... • Jellyfish are not increasing at the National Reference Stations. There were few major jellyfish sting events in tropical Australia in 2014/2015, but an unusually late Irukandji sting event at Ningaloo in June 2015 • The massive dust storm in 2009 caused a bloom of the fungus pathogen Aspergillus ...
... • Jellyfish are not increasing at the National Reference Stations. There were few major jellyfish sting events in tropical Australia in 2014/2015, but an unusually late Irukandji sting event at Ningaloo in June 2015 • The massive dust storm in 2009 caused a bloom of the fungus pathogen Aspergillus ...
The Marine Environment
... however, produces a relative drop in sea level. As a result of tectonic forces in the western United States, much of the West Coast is being pushed up much more quickly than the sea level is rising. Because much of the West Coast was formerly under water, it is called an emergent coast. Emergent coa ...
... however, produces a relative drop in sea level. As a result of tectonic forces in the western United States, much of the West Coast is being pushed up much more quickly than the sea level is rising. Because much of the West Coast was formerly under water, it is called an emergent coast. Emergent coa ...
Chapter 51. Biological Communities on Seamounts and Other
... Where flows are sufficiently vigorous, they provide a sufficient flow of organic matter to support suspension feeding organisms, such as corals and sponges. Such currents also winnow away the sediment, providing hard substrate necessary for most suspension feeders to settle and attach. Depending on ...
... Where flows are sufficiently vigorous, they provide a sufficient flow of organic matter to support suspension feeding organisms, such as corals and sponges. Such currents also winnow away the sediment, providing hard substrate necessary for most suspension feeders to settle and attach. Depending on ...
Seamounts, ridges, and reef habitats of American Samoa
... to sea level. It likely breached in the past and has since been eroded by wave action to produce a flat summit surface. South Bank has two perpendicular rifting zones trending nearly in line with the four cardinal directions (Figure 58.4). Though it is probably at least 1 million years old [1], its ...
... to sea level. It likely breached in the past and has since been eroded by wave action to produce a flat summit surface. South Bank has two perpendicular rifting zones trending nearly in line with the four cardinal directions (Figure 58.4). Though it is probably at least 1 million years old [1], its ...
2008, final Lecture 12 deep sea and hydro vents
... their harsh environment, they appear to have survived for many millions of years, and have apparently changed little in that time. Vent life appears to be more closely related to ancient ...
... their harsh environment, they appear to have survived for many millions of years, and have apparently changed little in that time. Vent life appears to be more closely related to ancient ...
The Biology, Ecology and Vulnerability of Seamount Communities
... terraces or summits of flat-topped seamounts (so-called guyots). Seamount sediments play host to a wide diversity of organisms that may burrow into sediments, live amongst sediment particles or on its surface. Animals living in the sands and muds of seamounts include various types of segmented and ...
... terraces or summits of flat-topped seamounts (so-called guyots). Seamount sediments play host to a wide diversity of organisms that may burrow into sediments, live amongst sediment particles or on its surface. Animals living in the sands and muds of seamounts include various types of segmented and ...
16_3eTIF
... inspiration, beauty and peace of mind which are mainstays of the tourism industry worldwide. Diff: 2 Objective: 16.3 Uses of marine resources ...
... inspiration, beauty and peace of mind which are mainstays of the tourism industry worldwide. Diff: 2 Objective: 16.3 Uses of marine resources ...
Plaice in the Celtic Sea, Beam trawl
... The mixed plaice and sole fishery in Divisions VIIf, g (Celtic Sea) is dominated by otter trawls (51% of the landings) and beam trawls (43%), with bycatch of both commercial and non-commercial species. The main fishery occurs in the spawning area off the north Cornish coast, at depths greater than 4 ...
... The mixed plaice and sole fishery in Divisions VIIf, g (Celtic Sea) is dominated by otter trawls (51% of the landings) and beam trawls (43%), with bycatch of both commercial and non-commercial species. The main fishery occurs in the spawning area off the north Cornish coast, at depths greater than 4 ...
16 - Glencoe
... global sea level was about 130 m lower than it is at present. Since that time, the melting of most of the ice-age glaciers has raised the ocean to its present level. In the last 100 years, the global sea level has risen 10 to 15 cm. It continues to rise slowly; estimates suggest a rise in sea level ...
... global sea level was about 130 m lower than it is at present. Since that time, the melting of most of the ice-age glaciers has raised the ocean to its present level. In the last 100 years, the global sea level has risen 10 to 15 cm. It continues to rise slowly; estimates suggest a rise in sea level ...
Mesoscale Eddies Are Oases for Higher Trophic Marine Life
... the surface scattering layer (15–100 m, red), intermediate depths (101–600 m, green), deep water (601–1000 m, blue), and the entire water column (black). Panel C shows the depth distribution of biomass (SV, dB) at 38 kHz over time along the indicated transect through the eddy centre. Water density c ...
... the surface scattering layer (15–100 m, red), intermediate depths (101–600 m, green), deep water (601–1000 m, blue), and the entire water column (black). Panel C shows the depth distribution of biomass (SV, dB) at 38 kHz over time along the indicated transect through the eddy centre. Water density c ...
Distribution and Feeding Ecology of Bathylagus euryops (Teleostei: Microstomatidae) Along the Northern Mid-Atlantic Ridge From Iceland to the Azores
... from 800 – 4500 m and extends over an area of 3.7 million km2. Recent evidence from MARECO, a Census of Marine Life field project, reported increased abundance and biomass of deeppelagic fishes below 1000 m on the MAR. Among the fishes sampled, Bathylagus euryops was found to be the biomass-dominant ...
... from 800 – 4500 m and extends over an area of 3.7 million km2. Recent evidence from MARECO, a Census of Marine Life field project, reported increased abundance and biomass of deeppelagic fishes below 1000 m on the MAR. Among the fishes sampled, Bathylagus euryops was found to be the biomass-dominant ...
Ecological Assessment of the HMCS Yukon Artificial Reef off
... The Yukon provides fish habitat that is a combination of deeper kelp-forest and canyonrim habitat in southern California. The fouling community on the Yukon is also still developing. There are presently abundant populations of the anenomes Metridium spp. and Corynactis californica over much of the s ...
... The Yukon provides fish habitat that is a combination of deeper kelp-forest and canyonrim habitat in southern California. The fouling community on the Yukon is also still developing. There are presently abundant populations of the anenomes Metridium spp. and Corynactis californica over much of the s ...
Ecological values of the 12 miles zone of Bonaire
... The hadalpelagic zone is the delineation for the deepest trenches in the ocean found from a depth of 6,000 meters to the bottom of the ocean. It is also known as the trench zone. This zone is characterized by low population and low diversity of marine life. ...
... The hadalpelagic zone is the delineation for the deepest trenches in the ocean found from a depth of 6,000 meters to the bottom of the ocean. It is also known as the trench zone. This zone is characterized by low population and low diversity of marine life. ...
Oceanic processes and the recruitment of tropical fish at Rottnest
... Rottnest Island each autumn are examined using historical current measurements in the Leeuwin Current near the Abrolhos Islands and along the continental shelf just north of Perth. Observations of two common damselfish between 1977 and 2002 (with enhanced detail of fish size categories from 1994) sh ...
... Rottnest Island each autumn are examined using historical current measurements in the Leeuwin Current near the Abrolhos Islands and along the continental shelf just north of Perth. Observations of two common damselfish between 1977 and 2002 (with enhanced detail of fish size categories from 1994) sh ...
Demersal fish
Demersal fish live and feed on or near the bottom of seas or lakes (the demersal zone). They occupy the sea floors and lake beds, which usually consist of mud, sand, gravel or rocks. In coastal waters they are found on or near the continental shelf, and in deep waters they are found on or near the continental slope or along the continental rise. They are not generally found in the deepest waters, such as abyssal depths or on the abyssal plain, but they can be found around seamounts and islands. The word demersal comes from the Latin demergere, which means to sink.Demersal fish are bottom feeders. They can be contrasted with pelagic fish which live and feed away from the bottom in the open water column. Demersal fish fillets contain little fish oil (one to four percent), whereas pelagic fish can contain up to 30 percent.