scholarly journals Vertical distribution of eggs and larvae of Maurolicus japonicus (Sternoptychidae, Pisces) in Tosa Bay, Japan

2019 ◽  
Vol 14 (2) ◽  
pp. 80-85
Author(s):  
Liezel C. Paraboles ◽  
Donna M. Guarte ◽  
Izumi Kinoshita
Keyword(s):  
Vertical Distribution ◽  
Tosa Bay ◽  
Eggs And Larvae

Vertical distribution of pilchard (Sardinops sagax) eggs and larvae off Southern Australia

1999 ◽  
Vol 50 (2) ◽  
pp. 117 ◽  
Author(s):  
W. J. Fletcher
Keyword(s):  
Vertical Distribution ◽  
Accurate Estimation ◽  
Relative Depth ◽  
Sardinops Sagax ◽  
Bottom Depth ◽  
Shelf Region ◽  
Opening And Closing ◽  
Egg Stages ◽  
Eggs And Larvae ◽  
Egg Abundance

Plankton samples were obtained from four to six discrete depths at 33 stations in July 1994 by using the ‘EZ’ multiple opening and closing net during a cruise along the shelf region from Adelaide to Albany, southern Australia. At the 19 stations (88 tows) where pilchard eggs were common, recently spawned eggs were most abundant at depths of 40–60 m, or 60% of total bottom depth. Most older egg stages were found closer to, or at, the surface. During day-time, most pilchard larvae were caught at the surface. At night, pilchard larvae appeared to spread out, with lower overall rates of capture but a bigger proportion caught below the surface. The effects of these changes in relative depth with age are discussed in relation to the accurate estimation pilchard egg abundance for biomass calculations.

scholarly journals Buoyancy and vertical distribution of Norwegian coastal cod (Gadus morhua) eggs from different areas along the coast

2008 ◽  
Vol 65 (7) ◽  
pp. 1198-1202 ◽  
Author(s):  
Erling Kåre Stenevik ◽  
Svein Sundby ◽  
Ann Lisbeth Agnalt
Keyword(s):  
Vertical Distribution ◽  
Density Gradient ◽  
Surface Waters ◽  
Gadus Morhua ◽  
Genetic Differences ◽  
Marine Science ◽  
Norwegian Coast ◽  
Spawning Areas ◽  
Subsurface Waters ◽  
Eggs And Larvae

Abstract Stenevik, E. K., Sundby, S., and Agnalt, A. L. 2008. Buoyancy and vertical distribution of Norwegian coastal cod (Gadus morhua) eggs from different areas along the coast. – ICES Journal of Marine Science, 65: 1198–1202. There are significant genetic differences in coastal cod (Gadus morhua) along the Norwegian coast, and in order to maintain these differences, there must be mechanisms that ensure local retention of eggs and larvae in the spawning areas. The buoyancy of eggs from four different areas along the Norwegian coast was measured using a density gradient column, and the results from modelling experiments showed that in three of the groups (Tysfjord, Helgeland, and Øygarden), the buoyancy in combination with local hydrography would place the eggs in subsurface waters where retention is greater than in surface waters.

Vertical distribution of cod and haddock eggs and larvae, feeding and condition in stratified and mixed waters on southern Georges Bank, May 1992

1996 ◽  
Vol 43 (7-8) ◽  
pp. 1875-1904 ◽  
Author(s):  
R.Gregory Lough ◽  
Elaine M. Caldarone ◽  
Teresa K. Rotunno ◽  
Elisabeth A. Broughton ◽  
Bruce R. Burns ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Georges Bank ◽  
Eggs And Larvae

scholarly journals Community structure and vertical distribution of oncaeid copepods in Tosa Bay, southern Japan

2009 ◽  
Vol 89 (3) ◽  
pp. 491-498 ◽  
Author(s):  
Yuichiro Nishibe ◽  
Yuuichi Hirota ◽  
Hiroshi Ueda
Keyword(s):  
Community Structure ◽  
Vertical Distribution ◽  
Water Column ◽  
Distribution Patterns ◽  
Depth Range ◽  
Tosa Bay ◽  
Southern Japan ◽  
Hydrographic Conditions ◽  
Epipelagic Zone ◽  
The Vertical Distribution

Community structure and vertical distribution of oncaeid copepods were investigated at an offshore site in Tosa Bay, southern Japan. Samples were collected with a 0.063 mm closing type net from eight discrete layers between the surface and 500 m depth in August and November 2005. A total of 45 species and three form variants belonging to the genera Triconia, Oncaea, Spinoncaea, Conaea and Epicalymma were identified. The greatest number of species was consistently found in the lower epipelagic zone, at 50–100 m. The vertical distribution patterns of oncaeid copepods were similar between August and November, with the highest abundances in the upper epipelagic zone above the thermocline. The oncaeid maxima corresponded with the depth where appendicularians occurred in high numbers. Dominant species in the water column (0–500 m) were O. venusta small form, O. media, O. scottodicarloi, O. waldemari, O. zernovi, O. tregoubovi, S. ivlevi, S. tenuis and T. conifera. The vertical succession of species composition was almost the same between August and November, although several species showed a downward shift of their depth-range to some extent in November. The oncaeid copepod community could be differentiated into three distinct groups according to the depth layers, each corresponding to different hydrographic conditions in the water column.

Observations on the Vertical Distribution of Eggs and Larvae of Mackerel and other Teleosts in the Celtic Sea and on the Sampling Performance of Different Nets in Relation to Stock Evaluation

1980 ◽  
Vol 60 (2) ◽  
pp. 295-311 ◽  
Author(s):  
A. J. Southward ◽  
B. McK. BARY
Keyword(s):  
Vertical Distribution ◽  
Geographical Pattern ◽  
Spawning Grounds ◽  
The Past ◽  
South West ◽  
Complete Survey ◽  
Celtic Sea ◽  
The Vertical Distribution ◽  
Eggs And Larvae ◽  
Made In

There is some controversy about the strength of the stock of mackerel in the Celtic Sea and off the coasts of Cornwall and Ireland, and it is difficult to find out if the numbers of mackerel in this area have fluctuated in the past (Johnson, 1977; Lockwood & Johnson, 1976; Lockwood, 1978; Coombs, Pipe & Mitchell, 1977,1979, 1980). The earliest complete survey of the south-west spawning grounds was made in 1937–9 (Steven & Corbin, 1939; Corbin, 1947) and was principally designed to show the seasonal and geographical pattern, not provide a basis for stock evaluation. Nevertheless, this survey is the only information we have about the breeding of mackerel in the days before the war when fishing was performed with drift-nets and lines, a period when we can assume exploitation was very much less intense than today when trawls and purse-seines are used. Attempts to use the 1937–9 data for estimation of the pre-war stock have been regarded as giving unsatisfactory results (Walsh, 1976). The data from the 1937–9 surveys were defective because we did not know the influence of the depth of fishing of the nets in relation to the vertical distribution of the eggs, nor the efficiency and catching capacity of the nets for sampling eggs and post-larvae.

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