scholarly journals A Study on the Characteristics of Fishery Resources Distribution in Coastal Waters of Yeongil Bay Using Acoustic Survey

2021 ◽  
Vol 11 (14) ◽  
pp. 6627
Author(s):  
Yoo-Won Lee ◽  
Woo-Seok Oh ◽  
Dong-Soo Kim ◽  
Doo-Jin Hwang ◽  
Kyoung-Hoon Lee
Keyword(s):  
Fish Species ◽  
Coastal Waters ◽  
East Sea ◽  
Common Squid ◽  
Dominant Fish ◽  
Target Fish ◽  
Resources Distribution ◽  
The Common ◽  
Db Difference ◽  
Water Depths

In this study, the identification of dominant fish species in the East Sea was conducted using the dB-difference method. The survey was conducted using the two frequencies of 38 and 120 kHz in transect 6 of the southern part of the East Sea. Information on fish species was identified using fishing gear and e-DNA, and the dominant target fish species were selected and analyzed as cod, anchovy, common squid, and herring. The dB-difference range for each fish species was set to −0.86 dB < ∆MVBS 38–120 kHz < 0.82 dB for cod and to the range of 2.66 dB < ∆MVBS 38–120 kHz < 2.84 dB for anchovy. The dB-difference of the common squid was set to −0.36 dB < ∆MVBS 38–120 kHz < 1.25 dB and to the range of 0.88 dB < ∆MVBS 38–120 kHz < 2.28 dB for herring; the fish species were then identified in the echograms. When comparing the results of swimming depths by fish species and previous studies, cod was detected mainly at the bottom of the sea, and anchovy and common squid were detected mainly at a depth of 50 m. Herring was detected to be mainly distributed in water depths from 50 to 150 m.

A Survey and Morphological Study of Plerocercoidal Nybelinia surmenicola (Cestoda: Tentaculariidae) in the Common Squid from the Korean Coastal Waters

2015 ◽  
Vol 32 (3) ◽  
pp. 239
Author(s):  
Hyeon-Cheol Kim ◽  
Jinho Park ◽  
Do-Hyeon Yu ◽  
Joon-Seok Chae ◽  
Jae-Gyu Yoo ◽  
...  
Keyword(s):  
Coastal Waters ◽  
Morphological Study ◽  
Common Squid ◽  
The Common

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.

Depth-dependent Variability of Fish Fauna in the Coastal Waters off Hupo, East Sea

2018 ◽  
Vol 30 (1) ◽  
pp. 36-45
Author(s):  
Chung Il Lee ◽  
Hea Kun Jung ◽  
Soon Man Kwon ◽  
Moon Hee Han ◽  
Kang Su Seol ◽  
...  
Keyword(s):  
Coastal Waters ◽  
Fish Fauna ◽  
East Sea

Temporo-spatial heterogeneity of dominant fish species in the Jiaozhou Bay community

2017 ◽  
Vol 24 (5) ◽  
pp. 1091
Author(s):  
Jia WO ◽  
Binduo XU ◽  
Ying XUE ◽  
Yiping REN ◽  
Chongliang ZHANG
Keyword(s):  
Spatial Heterogeneity ◽  
Fish Species ◽  
Jiaozhou Bay ◽  
Dominant Fish

Marine Quality Standards: Their Derivation and Application in the United Kingdom

1985 ◽  
Vol 17 (6-7) ◽  
pp. 1187-1198 ◽  
Author(s):  
G. Mance ◽  
A. R. O'Donnell
Keyword(s):  
Coastal Waters ◽  
Sublethal Effects ◽  
Quality Standards ◽  
Toxicity Data ◽  
Marine Life ◽  
Nickel Zinc ◽  
The United Kingdom ◽  
The Common ◽  
Lead Nickel ◽  
The Impact

This paper discusses the derivation of environmental quality standards for coastal waters and the difficulties of using such standards for controlling industrial discharges. Attention is focused on the common List II substances, copper, chromium, lead, nickel, zinc and arsenic - and their effects on marine life. The adequacy of existing toxicity data is discussed and it is concluded that long exposure tests are required to provide information on sublethal effects. Such data are currently limited. It is also important that consideration be given to the effects that reducing salinities and increasing temperatures have in increasing the toxicity of these substances. The complexity of interpreting the results of laboratory toxicity data to coastal waters is discussed with reference to a study of the impact of an industrial discharge.

scholarly journals Evaluation of Trace Metal Levels in Tissues of Two Commercial Fish Species in Kapar and Mersing Coastal Waters, Peninsular Malaysia

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Fathi Alhashmi Bashir ◽  
Mohammad Shuhaimi-Othman ◽  
A. G. Mazlan
Keyword(s):  
Trace Metal ◽  
Fish Species ◽  
Coastal Waters ◽  
Positive Association ◽  
Peninsular Malaysia ◽  
International Standards ◽  
Metal Concentrations ◽  
Commercial Fish ◽  
Metal Levels ◽  
The Relationship

This study is focused on evaluating the trace metal levels in water and tissues of two commercial fish species Arius thalassinus and Pennahia anea that were collected from Kapar and Mersing coastal waters. The concentrations of Fe, Zn, Al, As, Cd and Pb in these coastal waters and muscle, liver and gills tissues of the fishes were quantified. The relationship among the metal concentrations and the height and weight of the two species were also examined. Generally, the iron has the highest concentrations in both water and the fish species. However, Cd in both coastal waters showed high levels exceeding the international standards. The metal level concentration in the sample fishes are in the descending order livers > gills > muscles. A positive association between the trace metal concentrations and weight and length of the sample fishes was investigated. Fortunately the level of these metal concentrations in fish has not exceeded the permitted level of Malaysian and international standards.

scholarly journals Preventing crop raiding by the Vulnerable common hippopotamus Hippopotamus amphibius in Guinea-Bissau

Oryx ◽  
2016 ◽  
Vol 51 (2) ◽  
pp. 222-229 ◽  
Author(s):  
Luis M. González ◽  
Francisco G. D. Montoto ◽  
Tome Mereck ◽  
Junior Alves ◽  
José Pereira ◽  
...  
Keyword(s):  
Coastal Waters ◽  
Rice Fields ◽  
Crop Damage ◽  
Running Water ◽  
Rice Farmers ◽  
Guinea Bissau ◽  
Hippopotamus Amphibius ◽  
Electric Fencing ◽  
Effective Deterrent ◽  
The Common

AbstractGuinea-Bissau is host to the westernmost subpopulation of the common hippopotamus Hippopotamus amphibius, which is one of only two known populations inhabiting coastal waters. The presence of hippopotamuses causes conflict with rice farmers as a result of crop damage and the absence of effective measures to protect crops. To develop an effective method for protecting rice fields, we studied the patterns of access to flooded and rain-fed rice fields by hippopotamuses and assessed the effect of the installation of electric fences. Hippopotamuses were detected in 54% of the flooded fields (n = 100) and in 31.9% of the rain-fed fields (n = 91). They were detected more frequently in fields on offshore islands than on the mainland, in unfenced than in fenced fields, and in fields closer to running water. Hippopotamuses entered fenced flooded fields less frequently than unfenced, and were detected most frequently at the end of the rainy season and the start of the dry season, and in the period of vegetative stem growth. Electric fences were an effective deterrent and facilitated increased rice production. The maintenance and cost of the electric fencing were acceptable to farmers, and therefore the use of such fencing is recommended to resolve the conflict between hippopotamuses and farmers in Guinea-Bissau and in other areas with similar conditions.

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