Diel changes in vertical distribution and feeding activity of copepods in ice-covered Resolute Passage, Canadian Arctic, in spring 1992

1997 ◽  
Vol 11 (1-2) ◽  
pp. 205-219 ◽  
Author(s):  
Hiroshi Hattori ◽  
Hiroaki Saito
Keyword(s):  
Vertical Distribution ◽  
Feeding Activity ◽  
Canadian Arctic ◽  
Diel Changes

Diel changes in the vertical distribution of juvenile fish in the Zeeschelde Estuary

1999 ◽  
Vol 54 (6) ◽  
pp. 1329-1333 ◽  
Author(s):  
J. Maes ◽  
J. Pas ◽  
A. Taillieu ◽  
P. A. Van Damme ◽  
F. Ollevier
Keyword(s):  
Vertical Distribution ◽  
Juvenile Fish ◽  
Diel Changes ◽  
The Vertical Distribution

Diel Pelagic Foraging by a Pandalid Shrimp (Pandalus montagui) off Resolution Island (Eastern Hudson Strait)

1992 ◽  
Vol 49 (3) ◽  
pp. 565-576 ◽  
Author(s):  
C. Hudon ◽  
D. G. Parsons ◽  
R. Crawford
Keyword(s):  
Sex Ratio ◽  
Vertical Distribution ◽  
Feeding Activity ◽  
Bottom Trawl ◽  
Staple Food ◽  
Benthic Organisms ◽  
Size Frequency Distribution ◽  
Ratio Size ◽  
Plankton Sampler ◽  
The Vertical Distribution

The vertical distribution and diet of shrimp (Pandalus montagui) were investigated using a multistage plankton sampler (BIONESS) and were compared with those of shrimp captured on the bottom using a trawl. Massive nocturnal vertical migrations of shrimp were observed in association with intense pelagic feeding activity. The sex ratio, size frequency distribution, and diet of shrimp caught in the water column differed markedly from shrimp caught during their stay on the bottom. Pelagic migrants were mostly males (75%), extending their planktonic foray into morning hours, whereas ovigerous (12%) and nonovigerous (13%) females returned to the bottom at dawn. In the trawl, the representation of males (43%) and ovigerous females (45%) differed, but also fluctuated on a diel cycle. Stomachs of shrimp captured in the BIONESS were fuller and the contents were in better condition than found in shrimps captured in the bottom trawl. Pelagic shrimp fed opportunistically on a variety of zooplankters, using copepods as a staple food. Stomachs of shrimp from the bottom trawl contained chitinous debris, sand grains, and small amounts of benthic organisms. The occurrence of daily vertical feeding migrations results in the unavailability of a variable proportion of the total shrimp biomass to bottom trawls.

scholarly journals Diel changes in the vertical distribution of larval cutlassfish Trichiurus japonicus

2018 ◽  
Vol 99 (2) ◽  
pp. 517-523
Author(s):  
Daichi Uehara ◽  
Jun Shoji ◽  
Yuichiro Ochi ◽  
Shuhei Yamaguchi ◽  
Kazumitsu Nakaguchi ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Vertical Migration ◽  
Similar Pattern ◽  
Diel Vertical Migration ◽  
Seto Inland Sea ◽  
Upward Movement ◽  
Swim Bladder ◽  
Diel Changes ◽  
Trichiurus Japonicus ◽  
The Vertical Distribution

Diel vertical migration of the cutlassfish Trichiurus japonicus larvae were investigated by consecutive 24-h collections at 3-h intervals at a station in the central Seto Inland Sea, Japan in June and September. Only one larva was collected in June 2017, while 224 and 40 larvae were collected in September 2016 and 2017, respectively. Larvae were present only at depths of ≥ 11 m during the day, whereas they were present at depths of 1, 6, 11 and 16 m during the night. Migration was observed in larvae in which swim bladder formation was completed. A similar pattern, namely nocturnal occurrence at shallow depths only of the developed larvae, was observed in another 24-h survey, suggesting that the swim bladder regulates the upward movement of larvae at night.

scholarly journals Diel changes in food and feeding activity of sciaenid fishes from the South-western Atlantic, Brazil

2001 ◽  
Vol 61 (2) ◽  
pp. 197-216 ◽  
Author(s):  
L. S. H. SOARES ◽  
A. E. A. de M. VAZZOLER
Keyword(s):  
Food Habits ◽  
Feeding Activity ◽  
Fish Populations ◽  
Teleostean Fish ◽  
Night Time ◽  
Western Atlantic ◽  
Diel Changes ◽  
Eastern Brazil ◽  
Food And Feeding ◽  
Micropogonias Furnieri

Food habits and daily feeding activity of fish populations are important ecological variables for understanding their role in the ecosystem. Diel changes in feeding activity and dietary composition of juvenile whitemouth croaker Micropogonias furnieri, shortfin corvina Isopisthus parvipinnis, shorthead drum Larimus breviceps and of juvenile and adult banded croaker Paralonchurus brasiliensis were investigated from samples taken over a 24 hours period from 4 to 5 September 1987 on the continental shelf off South-eastern Brazil. Whitemouth croaker and banded croaker had a benthic diet based on polychaetes and some caridean shrimps and showed no diel feeding pattern. Shortfin corvina and shorthead drum fed on crustaceans and teleostean fish, the former species primarily on pelagic sergestid shrimps and benthic caridean shrimps, and the latter mainly on pelagic sergestid shrimps, mysidacean and benthic caridean shrimps. Shortfin corvina is primarily a diurnal feeder, but preyed on some items only at night. Shorthead drum is a night feeder, with minimum stomach fullness values between dawn and daytime, and maximum values between dusk and night time.

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