scholarly journals Diel variation in the vertical distribution of fish larvae forced by upwelling filaments off Punta Angamos (northern Chile)

2014 ◽  
Vol 42 (3) ◽  
pp. 401-417 ◽  
Author(s):  
Pablo M. Rojas
Keyword(s):  
Vertical Distribution ◽  
Fish Larvae ◽  
Diel Variation ◽  
Northern Chile ◽  
The Vertical Distribution ◽  
Distribution Of Fish

Diel vertical distribution of fish larvae during the winter-mixing period in the Northwestern Mediterranean

2004 ◽  
Vol 61 (8) ◽  
pp. 1243-1252 ◽  
Author(s):  
A. Sabatés
Keyword(s):  
Vertical Distribution ◽  
Water Column ◽  
Fish Species ◽  
Fish Larvae ◽  
Distribution Patterns ◽  
Diel Variation ◽  
Surface Layers ◽  
Light Levels ◽  
Vertical Distributions ◽  
The Vertical Distribution

Abstract The vertical distributions of the larvae of shelf and oceanic fish species that spawn during the winter-mixing period in the Mediterranean are described from 22 vertically stratified plankton tows. Diel differences in the vertical distribution patterns in relation to physical data and potential prey abundance throughout the water column were examined. Even in absence of stratification, the larvae of the various fish species showed different patterns of vertical distribution and diel changes. The larvae of shelf-dwelling species were found in the surface layers, mainly above 50-m depth, and with some exceptions, with very little diel variation in depth distribution. Therefore, the vertical distribution of the larvae of these species coincided with the maximum concentrations of their potential food, nauplii and copepodite stages of copepods. The larvae of mesopelagic fishes showed deeper distributions in the water column and most of these species were located closer to the surface during the day than at night. Given the homogeneity of the physical characteristics throughout the water column, except for light, this behaviour may be determined not only by the higher concentration of prey in the surface layers but also by adequate light levels for feeding.

scholarly journals ANALYSIS OF THE VERTICAL DISTRIBUTION OF THE ABUNDANCE OF SMALL PELAGIC FISH LARVAE IN THE GULF OF CALIFORNIA USING SUBMARINE VIDEOCAMERAS

2009 ◽  
Vol 24 (2) ◽  
pp. 153
Author(s):  
G. Aceves-Medina ◽  
C. J. Robinson ◽  
R. Palomares-García ◽  
J. Gómez-Gutierrez
Keyword(s):  
Vertical Distribution ◽  
Gulf Of California ◽  
Fish Larvae ◽  
Pelagic Fish ◽  
Small Pelagic Fish ◽  
Sardinops Sagax ◽  
Etrumeus Teres ◽  
Engraulis Mordax ◽  
The Vertical Distribution

Análisis de la distribucion vertical de la abundancia de larvas de peces pelágicos menores en el Golfo de California mediante videocámaras submarinas Se utilizaron dos tipos de videocámaras submarinas para estudiar la distribución y abundancia vertical de larvas de los peces pelágicos menores Engraulis mordax, Etrumeus teres y Sardinops sagax a 1 m de resolución, en una localidad en el norte del Golfo de California con condiciones de calma y alta densidad de sardinas adultas. La mayor abundancia promedio (900 larvas m -1 min -1 ) se encontró inmediatamente arriba de la termoclina (33 m) y la picnoclina (36 m), aparentemente no asociada al máximo de clorofila detectado en superficie, ni a la mayor densidad de peces adultos (10 -20 m). Las observaciones con video permitieron determinar la distribución vertical a una resolución imposible de obtener mediante muestreos con redes; sin embargo, esta es una técnica poco útil en zonas con elevada velocidad de las corrientes.

scholarly journals Vertical distribution of fish larvae in the Canaries-African coastal transition zone in summer

2006 ◽  
Vol 149 (4) ◽  
pp. 885-897 ◽  
Author(s):  
J.M. Rodríguez ◽  
S. Hernández-León ◽  
E.D. Barton
Keyword(s):  
Vertical Distribution ◽  
Transition Zone ◽  
Fish Larvae ◽  
Distribution Of Fish

scholarly journals Seasonal shifts in the vertical distribution of fish in a shallow coastal area

2016 ◽  
Vol 73 (9) ◽  
pp. 2278-2287 ◽  
Author(s):  
Noora Mustamäki ◽  
Henri Jokinen ◽  
Matias Scheinin ◽  
Erik Bonsdorff ◽  
Johanna Mattila
Keyword(s):  
Vertical Distribution ◽  
Sampling Design ◽  
Juvenile Fish ◽  
Trophic Levels ◽  
Strongly Correlated ◽  
High Connectivity ◽  
The Vertical Distribution ◽  
Spatial Resource Partitioning ◽  
Distribution Of Fish ◽  
Shallow Coastal Area

Abstract Depth structures aquatic habitats, creating substantial differences in the species composition of underwater communities even at small intervals. Those communities also undergo considerable cyclic variation annually. In this study, we surveyed variation in the vertical distribution of fish in a shallow (20 m) coastal basin in the northern Baltic Sea during the ice-free period from May to October. The waters were strongly mixed throughout the season and only transient signs of stratification were observed. As production shifted towards higher trophic levels over summer, with sequential biomass peaks in zooplankton and juvenile fish, the vertical distribution of the entire fish assemblage became increasingly even. The results suggest that spatial resource partitioning can be strongly correlated with seasonal productivity cycles even in physically uniform environments with high connectivity. Further, the results stress the importance of sampling design (seasonal and vertical coverage) of fish studies in shallow coastal areas.

Diel variation in the vertical distribution of deep-water scattering layers in the Gulf of Mexico

2016 ◽  
Vol 115 ◽  
pp. 91-102 ◽  
Author(s):  
Marta D'Elia ◽  
Joseph D. Warren ◽  
Ivan Rodriguez-Pinto ◽  
Tracey T. Sutton ◽  
April Cook ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Vertical Distribution ◽  
Deep Water ◽  
Diel Variation ◽  
The Vertical Distribution

Abundance and diurnal vertical distribution of fish larvae in early spring and summer in a fjord at South Georgia

1992 ◽  
Vol 4 (4) ◽  
pp. 405-412 ◽  
Author(s):  
A. W. North ◽  
A. W. A. Murray
Keyword(s):  
Vertical Distribution ◽  
Water Column ◽  
Fish Larvae ◽  
Abundant Species ◽  
Early Spring ◽  
Distinct Pattern ◽  
South Georgia ◽  
Gobionotothen Gibberifrons ◽  
Lepidonotothen Larseni ◽  
Distribution Of Fish

The diurnal vertical distribution and abundance of fish larvae was studied by net samples in the 265 m deep fjord of Cumberland East Bay, South Georgia. In early spring the six most abundant species of fish larvae in the upper 200 m of the water column were Champsocephalus gunnari, Lepidonotothen nudifrons, Pseudochaenichthys georgianus, Chaenocephalus aceratus, Parachaenichthys' georgianus and Electrona antarctica. In summer, the larvae of C. gunnari, Gobionotothen gibberifrons, Lepidonotothen larseni and Trematomus hansoni were most abundant, and the majority were found in the upper 140 m of the water column, with greatest densities in the top 2m. During both seasons most species showed some evidence of diurnal vertical migration. A distinct pattern was found for C. gunnari in summer; they were at 0–20 m during the day and 60–100 m at midnight. Net avoidance by the larvae of most species was greater before sunset in early spring, and during all periods of daylight in summer, than at other times of day.

scholarly journals Diel variation in the vertical distribution and schooling behaviour of sardine (Sardina pilchardus) off Portugal

2007 ◽  
Vol 64 (5) ◽  
pp. 963-972 ◽  
Author(s):  
Juan Zwolinski ◽  
Alexandre Morais ◽  
Vitor Marques ◽  
Yorgos Stratoudakis ◽  
Paul G. Fernandes
Keyword(s):  
Vertical Distribution ◽  
Small Schools ◽  
Pelagic Fish ◽  
Diel Variation ◽  
Sardina Pilchardus ◽  
Cross Sectional ◽  
Fish Schools ◽  
School Expansion ◽  
Schooling Behaviour ◽  
The Vertical Distribution

Abstract Zwolinski, J., Morais, A., Marques, V., Stratoudakis, Y., and Fernandes, P. G. 2007. Diel variation in the vertical distribution and schooling behaviour of sardine (Sardina pilchardus) off Portugal. – ICES Journal of Marine Science, 64: 963–972. Diel patterns in the schooling behaviour and vertical distribution of pelagic fish schools were studied by examining their echotraces from repeated acoustic survey transects at three inshore sites off the Portuguese coast. At two sites, sardine was the dominant pelagic species, and echotrace characteristics of fish schools were similar to those reported in the literature. At the third site, where there was a multispecies pelagic assemblage that included sardine, there was more variability in several of the school descriptors. At all sites, fish schools expanded after sunset, enlarging their cross-sectional area along the horizontal plane and reducing their mean internal acoustic density, while maintaining their overall mean abundance. Downward migration was rapid (within 1 h) after sunset and simultaneous with school expansion. School-like aggregations with total backscattering similar to daytime schools were present throughout the night, although the proportion of small schools and scattered fish appeared to increase at that time. At dawn, sardine rose back up the water column and rapidly reformed into the typical daytime schools. This pattern of diel vertical migration is opposite to that described for most clupeoids worldwide. The implications of this behaviour on abundance estimation by acoustic monitoring surveys for small pelagic fish are discussed.

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