Spatiotemporal distribution of anchovy early life stages in the eastern part of the Adriatic Sea in relation to some oceanographic features

2018 ◽  
Vol 99 (5) ◽  
pp. 1205-1211 ◽  
Author(s):  
B. Zorica ◽  
V. Čikeš Keč ◽  
A. Pešić ◽  
S. Gvozdenović ◽  
J. Kolitari ◽  
...  
Keyword(s):  
Early Life ◽  
Adriatic Sea ◽  
Geometric Mean ◽  
Temporal Distribution ◽  
Significant Negative Correlation ◽  
Spatial And Temporal Distribution ◽  
Life Stages ◽  
Early Life Stages ◽  
Eggs And Larvae ◽  
Egg Abundance

AbstractDuring the summer of 2013 two scientific surveys (northern, at the beginning of July and southern, at the end of July) were carried out along the eastern Adriatic Sea. In these surveys, ichthyoplankton samples of anchovy (Engraulis encrasicolus, Linnaeus 1758) eggs and larvae were collected. In the whole investigated area, egg and larvae abundance varied from 2.61 to 1040.24 eggs m−2 (geometric mean ± CL: 25.43 ± 1.48 eggs m−2) and 2.73 larvae m−2 to 611.14 larvae m−2 (geometric mean ± CL: 17.07 ± 1.41 larvae m−2), respectively. Higher abundance of anchovy early life stages was noted in the northern part of the investigated area. The length of the collected specimens lay within the range of 2.39–3.68 mm and those individuals were less than 12 h old. Analysis of spatial and temporal distribution of collected anchovy early life stages indicated their higher abundance in areas of upwelling (four areas were distinguished on the eastern Adriatic side). Larger and older specimens were collected at the beginning of July in the northern part of Adriatic indicating that the anchovy population in the Adriatic tends to shift among its spawning centres in this area. In general, anchovy eggs were accompanied by its larvae (r = 0.453, P < 0.05), while statistically significant negative correlation was obtained between egg abundance and temperature (r = −0.380, P < 0.05) as well as sea depth (r = −0.321, P < 0.05).

Transport, Distribution, and Abundance of Larval and Juvenile Walleye Pollock (Theragra chalcogramma) in the Western Gulf of Alaska

1991 ◽  
Vol 48 (1) ◽  
pp. 91-98 ◽  
Author(s):  
Sarah Hinckley ◽  
Kevin M. Bailey ◽  
Susan J. Picquelle ◽  
James D. Schumacher ◽  
Phyllis J. Stabeno
Keyword(s):  
Early Life ◽  
Gulf Of Alaska ◽  
Walleye Pollock ◽  
Theragra Chalcogramma ◽  
Life Stages ◽  
Early Life Stages ◽  
Early Juvenile ◽  
Walleye Pollock Theragra Chalcogramma ◽  
Eggs And Larvae ◽  
Egg Abundance

The spawning distribution of walleye pollock (Theragra chalcogramma) and subsequent southwesterly drift of eggs, larvae, and juveniles were investigated in Shelikof Strait, March–September 1987. In mid-March, a hydroacoustics survey found that spawning adults were concentrated in the deeper parts of Shelikof Strait, as were eggs collected in this area during an ichthyoplankton survey about 1 mo later. In May, a concentration of young larvae was found 100–150 km to the southwest of the spawning area. In late June and early July, the center of distribution of late larval and early juvenile walleye pollock was further to the southwest, between the Shumagin and Semidi Islands. By August and September, juveniles were mostly distributed downstream of the Shumagin Islands. The rate of drift of eggs and larvae through June was estimated at 4–6 cm/s. The trajectories of satellite-tracked buoys deployed in the region of greatest egg abundance revealed similar patterns to those of the early life stages of walleye pollock. These observations demonstrate that transport is an important factor determining the distribution of pollock larvae in downstream coastal nursery areas.

scholarly journals Influence of turbulence and in-stream structures on the transport and survival of grass carp eggs and larvae at various developmental stages

2019 ◽  
Vol 82 (1) ◽  
Author(s):  
Andres F. Prada ◽  
Amy E. George ◽  
Benjamin H. Stahlschmidt ◽  
Patrick Ryan Jackson ◽  
Duane C. Chapman ◽  
...  
Keyword(s):  
Grass Carp ◽  
Early Life ◽  
Developmental Stages ◽  
Shear Stresses ◽  
Life Stages ◽  
Early Life Stages ◽  
Field Collection ◽  
Hydrodynamic Experiments ◽  
Active Swimming ◽  
Eggs And Larvae

AbstractUnderstanding the response of grass carp to flow and turbulence regimes during early life stages is fundamental to monitoring and controlling their spread. A comprehensive set of hydrodynamic experiments was conducted with live grass carp eggs and larvae, to better understand their drifting and swimming patterns with 3 different in-stream obstructions: (1) a gravel bump, (2) a single cylinder, and (3) submerged vegetation. The hydrodynamic behavior of eggs and larvae with each obstruction was continuously monitored for about 85 consecutive hours. Transient spatial distributions of the locations of eggs and larvae throughout the water column were generated for each flow scenario. Results show that the active swimming capabilities of larvae allow them to seek areas of low turbulence and low shear stresses, and that eggs are susceptible to damage by high levels of turbulence, which was further corroborated with tests in an oscillating grid-stirred turbulence tank. Our study seeks to better inform field collection of grass carp during early life stages, and to guide the design of alternative approaches to control the dispersal of this invasive species in North America.

scholarly journals Dimethoate 40% organosphosphorous pesticide toxicity in Prochilodus lineatus (Prochilodontidae, Characiformes) eggs and larvae

2006 ◽  
Vol 66 (2b) ◽  
pp. 633-640 ◽  
Author(s):  
A. F. Campagna ◽  
M. N. Eler ◽  
E. L. G. Espíndola ◽  
J. A. Senhorini ◽  
R. F. do Rêgo ◽  
...  
Keyword(s):  
Early Life ◽  
Toxicity Tests ◽  
Ache Inhibitor ◽  
South American ◽  
Life Stages ◽  
Early Life Stages ◽  
Organophosphate Insecticide ◽  
Prochilodus Lineatus ◽  
Acetylcholinesterase Enzyme ◽  
Eggs And Larvae

Toxicity tests using early life stages of fish are of great importance in assessing risks to growth, reproduction and survival in polluted environments and are important tools for good environmental monitoring. However, a small number of standard bioassays of this type have been developed in Brazil. Curimbatá (Prochilodus lineatus) is an abundant South American characid fish of great commercial interest. It was chosen for testing different concentrations of 40% dimethoate, an organophosphate insecticide and acetylcholinesterase enzyme (AChE) inhibitor used widely in Brazil. The 48-h LC50 for eggs is higher than 16.0 µg.L-1, whereas for recently hatched larvae it was found to be significantly lower (11.81 µg.L-1, ranging between 10.23 µg.L-1 - 13.65 µg.L-1) and also significantl y lower than that for eggs by a Student t-test for independent samples (p = 0.03). The 96-h LC50 for 3-day old larvae was 10.44 µg.L-1 (8.03 µg.L-1 - 13.57 µg.L-1), similar to that of recently-hatched larvae (p = 0.76). Larval mobility was also found to be reduced by this insecticide.

Early life stages of Calanus pacificus are neither exposed nor sensitive to low pH waters

2019 ◽  
Vol 41 (6) ◽  
pp. 893-896
Author(s):  
Anna K McLaskey ◽  
Paul McElhany ◽  
D Shallin Busch ◽  
Michael Maher ◽  
Amanda K Winans ◽  
...  
Keyword(s):  
Early Life ◽  
Puget Sound ◽  
Individual Variability ◽  
Ph Effects ◽  
Life Stages ◽  
Early Life Stages ◽  
Calanus Pacificus ◽  
Small Decline ◽  
The Vertical Distribution ◽  
Eggs And Larvae

Abstract We characterized the vertical distribution of Calanus pacificus eggs and larvae and the carbonate chemistry that they are exposed to in Puget Sound, WA. We found that, under stratified conditions, more than 90% of eggs and nauplii stages 1–4 were distributed above the pycnocline, in seawater with pH higher than 7.7. In addition, eggs and larvae from 101 females were reared for 5 days under a range of pH conditions (7.2–8.0) to investigate how pH sensitivity varies among individuals. We observed a slight increase in naupliar survival at pH 7.3 in Individual Brood experiments, while in Mixed Brood experiments, exposure to pH 7.3 led to a small decline in hatching success. In a Split Brood experiment, inter-individual variability among different females’ broods masked pH effects. These results indicate that C. pacificus early life stages are generally tolerant to short-term direct effects of ocean acidification.

Spatio-temporal distribution of polar cod (Boreogadus saida) and saffron cod (Eleginus gracilis) early life stages in the Pacific Arctic

Polar Biology ◽  
2019 ◽  
Vol 42 (5) ◽  
pp. 969-990 ◽  
Author(s):  
Cathleen D. Vestfals ◽  
Franz J. Mueter ◽  
Janet T. Duffy-Anderson ◽  
Morgan S. Busby ◽  
Alex De Robertis
Keyword(s):  
Early Life ◽  
Temporal Distribution ◽  
Polar Cod ◽  
Life Stages ◽  
Boreogadus Saida ◽  
Early Life Stages ◽  
The Pacific ◽  
Polar Cod Boreogadus Saida ◽  
Saffron Cod ◽  
Spatio Temporal

scholarly journals Spatial distribution of sardine and anchovy early life stages along the eastern Adriatic Sea

2015 ◽  
Vol 2 ◽  
Author(s):  
Zorica Barbara ◽  
Cikes Kec Vanja ◽  
Brzulja Goran ◽  
Kraljević Viktor
Keyword(s):  
Spatial Distribution ◽  
Early Life ◽  
Adriatic Sea ◽  
Life Stages ◽  
Early Life Stages
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