Feeding intensity and diet composition of Indian shad Tenualosa ilisha (Hamilton, 1822) occurring in Hooghly estuary of West Bengal

2020 ◽  
Vol 52 (1) ◽  
pp. 052
Author(s):  
Sudipta Sarkar ◽  
Sudhir Kumar Das ◽  
Dibakar Bhakta
Keyword(s):  
Diet Composition ◽  
West Bengal ◽  
Feeding Intensity ◽  
Hooghly Estuary ◽  
Tenualosa Ilisha

scholarly journals Feeding ecology of Serrasalmus gouldingi (Characiformes: Serrasalmidae) in the lower Anapu River region, Eastern Amazon, Brazil

2016 ◽  
Vol 46 (3) ◽  
pp. 259-270 ◽  
Author(s):  
Bruno da S. PRUDENTE ◽  
Pedro CARNEIRO-MARINHO ◽  
Roberta de M. VALENTE ◽  
Luciano F. de A. MONTAG
Keyword(s):  
Feeding Ecology ◽  
Diet Composition ◽  
Niche Breadth ◽  
Life Stage ◽  
Flood Pulse ◽  
Feeding Intensity ◽  
High Tendency ◽  
Flood Season ◽  
River Region ◽  
The Relationship

Abstract Studies on feeding ecology of fishes are important to understand the relationship between species and environmental seasonal variations. In tropical rivers, these relationships are mainly modeled by hydrological patterns. Thereby, this study aimed to assess the influence of fluviometric variation and life stage (juveniles and adults) in the feeding ecology of Serrasalmus gouldingi in the lower Anapu River region, located in Eastern Amazon, Pará, Brazil. Specimens were collected bimonthly, considering four different hydrological periods. We assessed the diet composition, feeding intensity and niche breadth of the species. Thirty-two dietary items were identified and grouped into ten categories. A total of 279 stomachs were analyzed, showing a predominance of fish fragments, followed by fruits and seeds. The diet composition of S. gouldingi differed only between drought and flood season, although it did not differ between juveniles and adults. An increase in feeding intensity was recorded during the rise in the water level, with a lower feeding intensity observed during transitional season. Serrasalmus gouldingi showed lower niche breadth during flood season, attributed to the high consumption of fruits and seeds, presenting an omnivorous diet with high tendency towards piscivory. Although less evident than in other Amazon watersheds, the flood pulse in the lower Anapu River region is an important factor influencing the feeding ecology of the species.

Food habits and dietary overlap of perlid stoneflies (Plecoptera) in a tributary of Lake Ontario

1981 ◽  
Vol 59 (10) ◽  
pp. 2030-2037 ◽  
Author(s):  
James H. Johnson
Keyword(s):  
New York ◽  
Food Consumption ◽  
Food Habits ◽  
Diet Composition ◽  
Lake Ontario ◽  
Food Habit ◽  
Dietary Overlap ◽  
Feeding Intensity ◽  
Similar Formula

Food habit studies were conducted on the nymphs of three species of sympatric perlid stoneflies from May to September 1979 in Orwell Brook, New York. A total of 1106 specimens were examined, which included 744 Phasganophora capitata, 251 Paragnetina immarginata, and 111 Acroneuria abnormis. Chironomids, trichopterans, and ephemeropterans were generally the principal, prey of all three species. Using Horn's measure of overlap, the monthly diets of P. immarginata and P. capitata were most similar [Formula: see text] and the diets of A. abnormis and P. immarginata[Formula: see text] least similar. Diel trends in food consumption during July indicated that the feeding intensity of both P. immarginata and P. capitata was the greatest from 2100 to 0500 hours. Examination of the guts of P. immarginata and P. capitata at 4-h intervals over a 24-h period showed that there was considerable variation in the diel diet composition of these species.

Composition and variations in the abundance of zooplankton in the Hooghly estuary, West Bengal, India

1986 ◽  
Vol 95 (2) ◽  
pp. 125-134 ◽  
Author(s):  
S K Sarkar ◽  
B N Singh ◽  
A Choudhury
Keyword(s):  
West Bengal ◽  
Hooghly Estuary

scholarly journals Feeding ecology of Dash-dot Tetra Hemigrammus belottii(Steindachner 1882) (Characiformes: Characidae) in the streams of the Urucu River basin, central Amazonia, Brazil

2013 ◽  
Vol 13 (3) ◽  
pp. 141-147 ◽  
Author(s):  
Andrey Felipe Gomes Gonçalves ◽  
Bruno da Silveira Prudente ◽  
Fernando da Silva Carvalho Filho ◽  
Luciano Fogaça de Assis Montag
Keyword(s):  
Spatial Distribution ◽  
River Basin ◽  
Feeding Ecology ◽  
Standard Length ◽  
Diet Composition ◽  
Feeding Habits ◽  
Dry Season ◽  
Feeding Intensity ◽  
Central Amazonia

The present study describes aspects of feeding ecology of Dash-dot TetraHemigrammus belottii (Characiformes: Characidae) collected in the Urucu River basin in Coari, Amazonas (Brazil), aims to respond the following question: What is the influence of hydrological periods (dry and wet) and spatial distribution in the diet of H. belottii? The specimens were collected between 2006 and 2009 in seven streams in the Urucu basin using standard capture methods. Their stomachs were removed for diet composition analyses. The alimentary items were weighed and identified for subsequent analyzes related to feeding intensity by repletion index (RI%) and importance by alimentary index (AIi%). A total of 227 specimens were analyzed, with a mean standard length of 16.5±5.6 mm. The RI% values indicated that H. belottii fed more intensively during the dry season. The principal items in the diet were Formicidae (IAi% = 69.6), fragments of allochthonous exoskeleton (IAi% = 17.7), and Coleoptera (IAi% = 6.0). The composition of the diet did not vary significantly between seasons or among habitats, which may be related to the abundance of the items exploited by the species throughout the year. Hemigrammus belottii showed a generalist insectivore feeding habits which was mainly composed by allochthonous item.

scholarly journals The role of closed areas in rebuilding monkfish populations in the Gulf of Maine

2008 ◽  
Vol 65 (7) ◽  
pp. 1326-1333 ◽  
Author(s):  
Melissa D. Smith ◽  
Jonathan H. Grabowski ◽  
Philip O. Yund
Keyword(s):  
New England ◽  
Diet Composition ◽  
Gulf Of Maine ◽  
Fish Habitat ◽  
Juvenile Fish ◽  
Habitat Type ◽  
Management Tool ◽  
Feeding Intensity ◽  
Groundfish Fishery

Abstract Smith, M. D., Grabowski, J. H., and Yund, P. O. 2008. The role of closed areas in rebuilding monkfish populations in the Gulf of Maine. – ICES Journal of Marine Science, 65: 1326–1333. The use of fish closures as a management tool to protect juvenile fish habitat and adult spawning grounds has become increasingly popular, although knowledge of the direct effects of marine closures on juvenile fish populations is limited. Given that monkfish landings account for a considerable percentage of the monetary value derived from the groundfish fishery in new England, investigating the factors that influence monkfish population dynamics will assist managers in sustaining this important natural resource. We conducted bottom-trawl surveys to determine the effects of closure status [inside vs. outside the Western Gulf of Maine Closure Area (WGMCA)] and habitat type (mud bottom in isolation from gravel or cobble bottom vs. mud that is next to these more complex habitats) on the distribution, abundance, and diet composition of monkfish (Lophius americanus) in the Gulf of Maine. Surprisingly, the abundance of adult monkfish did not differ in vs. out of the closure, and juvenile monkfish were more abundant outside of the WGMCA, where they also exhibited higher feeding intensity and consumed more prey biomass. Monkfish diet and condition results implied that the boulder and ledge bottom is essential monkfish habitat and that these effects were independent of the WGMCA.

scholarly journals Food supply for nekton in the epipelagic layer of Pacific waters at Kuril Islands in the summer seasons of 2000s

2014 ◽  
Vol 176 (1) ◽  
pp. 240-260
Author(s):  
Svetlana V. Naydenko ◽  
Alexey A. Khoruzhiy
Keyword(s):  
Diet Composition ◽  
Kuril Islands ◽  
Feeding Intensity ◽  
Deep Waters ◽  
Pacific Waters ◽  
The Pacific ◽  
Food Needs ◽  
Total Stock ◽  
Deep Water Part ◽  
Epipelagic Layer

Data of 8 surveys conducted by Pacific Fish. Res. Center (TINRO) in the Pacific waters at Kuril Islands in 2004-2012 are summarized to consider forage base and food relationships of nekton and plankton and to estimate consumption of forage resourced by nekton. The total stock of zooplankton and micronekton in the epipelagic layer changed from 62 to 158 million tons over the shelf and slope of the surveyed area and from 41 to 75 million tons in its deep-water part. Mezopelagic fishes, squids, pacific salmons, and subtropical fishes were the main consumers of these forage resources in summer. The portion of zooplankton stock consumed annually by nekton was relatively low: 4.2-9.3 % for shelf and slope areas (data for 2004, 2007, and 2011) and 4.5-15.6 % for the deep-waters (data for 2004, 2007, 2009, and 2011), without significant year-to-year changes in the diet composition and feeding intensity of nekton. There is concluded that zooplankton and micronekton of the studied area serve successively the food needs of its consumers and carrying capacity of the epipelagic layer in the Pacific waters at Kuril Islands is quite substantial.

Variations in the feeding intensity and diet composition of red mullet (Mullus barbatus) during 24-h period in the summertime in Hisarönü Bay

2002 ◽  
Vol 82 (3) ◽  
pp. 527-528 ◽  
Author(s):  
A. Ünlüoğlu ◽  
B. Cihangir ◽  
M. Kaya ◽  
H.A. Benli ◽  
T. Katağan
Keyword(s):  
Diet Composition ◽  
Feeding Activity ◽  
Bottom Trawl ◽  
Relative Importance ◽  
Feeding Intensity ◽  
Early Evening ◽  
Maximum Value ◽  
Red Mullet ◽  
Diel Variations ◽  
Almost All

Diel feeding pattern of red mullet in the Hisarönü Bay was studied from samples collected by bottom trawl during a 24-h period in the summer of 1997. Feeding activity of red mullet commenced at dawn and reached its maximum value at noon. During the period between noon to early evening, feeding intensity slowed down and then showed a small increase towards sunset. After sunset, the feeding activity nearly stopped and fish with empty stomachs increased. At night almost all stomachs were empty. Polychaetes, decapods, bivalves and amphipods were the major prey groups in the diet of red mullet and no significant diel variations were observed in the relative importance of these groups.

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