Influence of ice concentration and thickness on under-ice ambient noise levels in shallow coastal waters of Liaodong Bay, China

2021 ◽  
pp. 107706
Author(s):  
Liangliang Yang ◽  
Xiaomei Xu ◽  
Per Berggren
Keyword(s):  
Coastal Waters ◽  
Ambient Noise ◽  
Liaodong Bay ◽  
Noise Levels ◽  
Ice Concentration ◽  
Shallow Coastal Waters

THE NUMBER AND QUALITATIVE CHARACTERISTICS OF FRY FISH IN SHALLOW COASTAL WATERS OF THE VOLGA IN THE SUMMER-AUTUMN PERIOD OF 2012

2017 ◽  
pp. 65-73
Author(s):  
Edward Vladimirovich Nikitin
Keyword(s):  
Fish Species ◽  
Coastal Waters ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Volga River ◽  
Commercial Fish ◽  
Autumn Period ◽  
Fish Juveniles ◽  
Qualitative Characteristics ◽  
Shallow Coastal Waters

Shallow coastal waters of the Volga river is a flooded feeding area for fish juveniles of nonmigratory fish species. There takes place annual downstream migration of fluvial anadromous fish species from spawning grounds of the Volga river to the Northern Caspian Sea. The most important factors determining the number and qualitative characteristics of fry fishes are the level of the Caspian Sea (currently having a tendency to the lowering), hydrological and thermal regimes of the Volga river. Researches were carried out in definite periods of time. In the summer-autumn period of 2012 fry fishes were presented by 19 species (13 of them were commercial species), which belonged to 9 families. The article gives data on all the commercial fish species. In the first decade of July the maximum number of fry fish was registered in the western part of the Volga outfall offshore - in box 247 (19.86 mln specimens/km2), in the eastern part - in box 142 (20.4 mln specimens/km2). The most populous were roach, red-eye, silver bream and bream; size-weight characteristics were better in the areas remoted from the Volga delta. In the third decade of July the quantitative indicators of fry fish on these areas decreased, size-weight characteristics greatly increased. In the second decade of October in the western part of the seaside there were registered increased pre-wintering concentrations of fish juveniles, their qualitative indicators increased, which is evidence to favorable feeding conditions in 2012.

scholarly journals A new species of sea urchin associating clingfish of the genus Dellichthys from New Zealand (Teleostei, Gobiesocidae)

ZooKeys ◽  
2018 ◽  
Vol 740 ◽  
pp. 77-95 ◽  
Author(s):  
Kevin W. Conway ◽  
Andrew L. Stewart ◽  
Adam P. Summers
Keyword(s):  
New Species ◽  
New Zealand ◽  
Sexual Dimorphism ◽  
Sea Urchin ◽  
Coastal Waters ◽  
Sensory System ◽  
A New Species ◽  
Shallow Coastal Waters

A new species of clingfish, Dellichthystrnskii sp. n. is described on the basis of 27 specimens, 11.9–46.0 mm SL, collected from intertidal and shallow coastal waters of New Zealand. It is distinguished from its only congener, D.morelandi Briggs, 1955 by characters of the cephalic sensory system and oral jaws, snout shape, and colouration in life. A rediagnosis is provided for D.morelandi, which is shown to exhibit sexual dimorphism in snout shape.

Extensive CO2 emissions from shallow coastal waters during passage of Hurricane Irene (August 2011) over the Mid-Atlantic Coast of the U.S.A

2014 ◽  
Vol 59 (5) ◽  
pp. 1651-1665 ◽  
Author(s):  
Joseph R. Crosswell ◽  
Michael S. Wetz ◽  
Burke Hales ◽  
Hans W. Paerl
Keyword(s):  
Co2 Emissions ◽  
Coastal Waters ◽  
Atlantic Coast ◽  
Hurricane Irene ◽  
Shallow Coastal Waters

Influence of Wind-produced Noise on Orientation in the Sole (Solea solea)

1994 ◽  
Vol 51 (6) ◽  
pp. 1258-1264 ◽  
Author(s):  
J. P. Lagardère ◽  
M. L. Bégout ◽  
J. Y. Lafaye ◽  
J. P. Villotte
Keyword(s):  
Spatial Distribution ◽  
Ambient Noise ◽  
Sound Intensity ◽  
Weather Conditions ◽  
Fish Populations ◽  
Positioning System ◽  
Noise Levels ◽  
Orientation Behaviour ◽  
Solea Solea ◽  
Swimming Trajectories

Sole (Solea solea), telemetered in an enclosure using an acoustic positioning system, changed their swimming trajectories and orientation behaviour as a function of wind strength and direction. Monitoring of the spatial variation in both wind-generated currents and noise spectra in the enclosure indicates that these behavioural changes correspond to patterns in the spatial distribution of noise and to sound intensity. Thus, our observations indicate that sole perceives and reacts to horizontal variability in ambient noise levels. Such behaviour may be important in determining movements of fish populations at sea during poor weather conditions.

S254 – Bone Conduction Noise Exposure via Ventilators in the NICU

2008 ◽  
Vol 139 (2_suppl) ◽  
pp. P160-P160
Author(s):  
Angela P Black ◽  
James D Sidman
Keyword(s):  
Ambient Noise ◽  
Noise Exposure ◽  
Bone Conduction ◽  
Sound Level ◽  
Noise Levels ◽  
High Noise ◽  
Endotracheal Tubes ◽  
Level Meter ◽  
Hearing Damage ◽  
Air Conduction

Objectives To demonstrate that neonatal ventilators produce high noise levels through bone conduction (BC) via endotracheal tubes, as well as air conduction (AC) from ambient noise. Methods A sound level meter was used to measure the noise levels 4 feet from the ventilator and in direct contact at the end of a balloon attached to the ETT to simulate the noise presented to the infant. 3 commonly used neonatal ventilators (Sensormedics 3100A, VIP Bird and Bunnell Jet) were examined. Results Noise levels were significantly higher (6 – 14 dB) at the end of the ETT than 4 ft from the ventilator for all ventilators studied. Conclusions Previous studies have shown high ambient noise levels in NICUs, but have failed to address the actual noise presented to the infant. ETT transmission of noise as a direct bone stimulus through the skull has been overlooked. This study has shown that high noise intensities are being presented not only as AC, but as BC to the infants though the ETT. This study demonstrates, therefore, that ear protection alone will not save these at-risk infants from hearing damage. More must be done to decrease noise exposure and develop quieter machines.

Studies of sound transmission fluctuations in shallow coastal waters

1969 ◽  
Vol 265 (1169) ◽  
pp. 567-606 ◽  
Keyword(s):  
Interference Pattern ◽  
Coastal Waters ◽  
Water Structure ◽  
Acoustic Measurements ◽  
Phase Fluctuations ◽  
Wave Effects ◽  
Tidal Changes ◽  
Streaming Velocity ◽  
The Mean ◽  
Shallow Coastal Waters

The propagation and fluctuation of sound have been studied in shallow coastal waters off the British Isles. The environment and the special environmental measurements are described. Acoustic measurements were made for various ranges between about 2 and 137 km, with bottom-laid transducers. Frequencies used were mainly 1, 2 and 3 kHz, most often transmitted continuously but sometimes pulsed. The investigations have extended over several years, and amplitude and phase fluctuations have been found with periods ranging from a year to less than a second. The nine fluctuation mechanisms which have been identified may be summarized as: ( a ) seasonal in amplitude, (seasonal in phase, ( c ) attenuation due to fish which sometimes causes a greatly reduced amplitude at night when the shoals break up, ( d ) storm effects, (e) tidal changes in depth which sweep an interference pattern past the receiver, ( f ) tidal changes in the shear flow or the water structure which also affect the interference pattern, ( g ) phase effects due to tidal changes in the mean streaming velocity, ( h ) fluctuations of a minutes period, some due to fish, ( i ) surface wave effects, which depend critically on the position in the tidal interference cycle. The above nine effects are really all subjects in their own right, and here large advances are described for seven of them. Most of the effects are both new and important, to be measured in many tens of decibels and in hundreds of phase cycles, but perhaps special attention should be drawn to the significance of the work on fish.

scholarly journals New Records of Seagrass Flora in Air Bangis West Sumatera

2012 ◽  
Vol 13 (1) ◽  
pp. 77
Author(s):  
Eni Kamal ◽  
Japar Sidik Bujang ◽  
Muta Hara Zakaria
Keyword(s):  
Coral Reefs ◽  
West Coast ◽  
Coastal Waters ◽  
New Record ◽  
New Records ◽  
Thalassia Hemprichii ◽  
Habitat Characteristic ◽  
Halodule Uninervis ◽  
Width Measurements ◽  
Shallow Coastal Waters

Seagrasses in the Air Bangis Archipelago, west coast of Sumatra were found growing in sandy muddy substratesof the shallow coastal waters at depth of 0.3-2.5 m, dominated by degraded coral reefs around the off-shoreislands. Two species; Enhalus acoroides (L.f) Royle and Thalassia hemprichii (Ehrenb) Aschers were observed atPulau Unggas, Pulau Pasir Panjang and Teluk Tapang. Halodule uninervis (Forssk) Aschers was observed in twolocations; Pasir Panjang and Teluk Tapang. The occurrence of this species is unknown previously and therefore itis a new flora record for Sumatra. With this new record, Sumatra has six species of seagrasses, contributing tohalf of total number of seagrasses occurring in Indonesia. According to leaf width measurements, two morphologicalvariants (narrow and wide leaved) can be distinguished for Halodule uninervis. In addition, descriptions of thespecies and their habitat characteristic are provided.

Assemblage characteristics and diet of fish in the shallow coastal waters of James Ross Island, Antarctica

Polar Biology ◽  
2016 ◽  
Vol 39 (12) ◽  
pp. 2299-2309 ◽  
Author(s):  
P. Jurajda ◽  
K. Roche ◽  
I. Sedláček ◽  
L. Všetičková
Keyword(s):  
Coastal Waters ◽  
James Ross Island ◽  
Shallow Coastal Waters

Incidental capture of sea-snakes (Hydrophiidae) by prawn trawlers in the Gulf of Carpentaria, Australia

1994 ◽  
Vol 45 (3) ◽  
pp. 429 ◽  
Author(s):  
TJ Wassenberg ◽  
JP Salini ◽  
H Heatwole ◽  
JD Kerr
Keyword(s):  
Survival Rate ◽  
Coastal Waters ◽  
Significant Interaction ◽  
Catch Per Unit Effort ◽  
Sea Snake ◽  
Incidental Capture ◽  
Seasonal Movement ◽  
Sea Snakes ◽  
Breeding Cycles ◽  
Shallow Coastal Waters

Sea-snakes were collected from research trawlers and commercial prawn trawlers in the Gulf of Carpentaria during the period from April 1976 to December 1991. The data were analysed on the basis of CPUE (catch per unit effort) for depth, latitude and season. The research trawlers, operating in the eastern Gulf of Carpentaria, and the commercial prawn trawlers, operating in the south-western Gulf of Carpentaria, caught sea-snakes at a rate of 0.028 and 0.026 sea-snakes per metre of headrope length per hour, respectively. Lapemis hardwickii was the sea-snake most commonly caught by the research trawlers-53% of all snakes-and Hydrophis elegans was the sea-snake most commonly caught by commercial trawlers-25% of all snakes. Depth was the most significant factor affecting CPUE, with more than 70% of all sea-snakes being caught in waters less than 15 m deep. When catches of all species were combined, a significant interaction (P<0.05) existed between depth and season. L. hardwickii specimens were caught more frequently in shallow coastal waters (< 15 m deep) in spring but in deeper water further offshore in autumn. A significant interaction between latitude and depth was found for Astrotia stokesii; specimens were caught more frequently in deeper water at 14% Enhydrina schistosa is generally coastal, with 8800 of specimens being caught in water less than 10 m deep. Seasonal movement of sea-snakes between inshore and offshore waters may be linked to their breeding cycles. The estimated number of sea-snakes captured in the Gulf of Carpentaria for the 1991 prawning season ranged from 73 583 to 165 559, with a mean of 119 571. The survival rate of sea-snakes from commercial prawn trawls was about 60% and hence between 29 801 and 67 051 sea-snakes are estimated to have died.

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