Feeding habits of John Dory, Zeus faber, off the Portuguese continental coast

1999 ◽  
Vol 79 (2) ◽  
pp. 333-340 ◽  
Author(s):  
Alexandra Silva
Keyword(s):  
Prey Species ◽  
Feeding Habits ◽  
Parallel Evolution ◽  
Stomach Contents ◽  
Abundant Species ◽  
Temporal Variations ◽  
Food Composition ◽  
Diet Shift ◽  
Feeding Intensity ◽  
Zeus Faber

The feeding habits of John Dory (Zeus faber) were studied, based on the analysis of stomach contents from fish sampled in five groundfish surveys. These surveys were carried out off the Portuguese coast during different seasons between 1990 and 1992. The main aspects of feeding biology analysed in this paper are: ontogenetic diet changes, temporal variations in food composition and feeding intensity. Multivariate methods were used to investigate ontogenetic diet shifts. Two main length groups were identified: 8.0–24.9 cm fish, feeding mainly on dragonets and silvery pout, and 25.0–55.9 cm fish whose diet was mainly composed of blue whiting and snipefish. A transitional phase (24.0–30.9 cm fish) with a mixed food composition was observed. This ontogenetic diet shift does not seem to correspond to any important change in body morphology but it does coincide with the onset of sexual maturity in the species.John Dory switched from a diet of small prey species with more pronounced benthic behaviour to a diet of larger schooling pelagic species. This suggests parallel evolution to more pelagic foraging behaviour. However, John Dory feeding habits appear to be largely controlled by the availability and accessibility of prey species: (i) the diet of adult John Dory is dominated by very abundant species; (ii) shifts in the main prey items between different times of the year and between different areas seem to be related both with their absolute and relative abundance in the environment and with the overlap between the depth distribution of predator and prey.

Intrapopulation variation in the diet of franciscana dolphin (Pontoporia blainvillei) off southern Brazil

2021 ◽  
pp. 1-17
Author(s):  
Manuela Bassoi ◽  
Eduardo R. Secchi ◽  
Daniel Danilewicz ◽  
Ignacio B. Moreno ◽  
Roberta A. Santos ◽  
...  
Keyword(s):  
Sexual Maturity ◽  
Linear Models ◽  
Prey Species ◽  
Prey Availability ◽  
Prey Selection ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Brazilian Coast ◽  
Pontoporia Blainvillei ◽  
Franciscana Dolphin

Abstract The franciscana dolphin (Pontoporia blainvillei) is a coastal dolphin endemic to the western South Atlantic Ocean. The dolphin is listed as vulnerable in the IUCN Red List, with incidental catches in gillnet fisheries the greatest conservation concern for this species. Insights into the feeding habits of this dolphin are essential to understand its distribution, movements and use of habitat, which are fundamental for effective management of the species. The feeding habits of franciscana dolphins were investigated from analyses of stomach contents of animals incidentally caught by two fishing operations from southern and northern regions of the southern Brazilian coast. In this study we investigate the existence of intrapopulation (sexual maturity and sex-related) variation in the diet of the franciscana dolphin, evaluating the spatial (northern and southern geographic areas) and seasonal influences. The analyses were based on Linear and Generalized Linear Models (LM and GLM). The majority of identified prey species were bottom-dwelling teleosts and the squid Doryteuthis sanpaulensis. The most important prey differed spatially and seasonally between northern and southern regions of the study area, and our results revealed significant differences between sexes and sexual maturity stages, mainly related to prey species sizes. This variation might indicate differences in prey selection, availability or habitat use patterns among these groups. In any case, these dietary differences are likely to minimize intraspecific competition for food resources, and/or indicate spatio-temporal variation in prey availability.

scholarly journals Finless porpoises (Neophocaena asiaeorientalis) in the East China Sea: insights into feeding habits using morphological, molecular, and stable isotopic techniques

2017 ◽  
Vol 74 (10) ◽  
pp. 1628-1645 ◽  
Author(s):  
Bingyao Chen ◽  
Lin Wang ◽  
Hui Wang ◽  
Shanshan Li ◽  
Thomas A. Jefferson ◽  
...  
Keyword(s):  
East China Sea ◽  
Prey Species ◽  
Trophic Position ◽  
Feeding Habits ◽  
Stomach Contents ◽  
East China ◽  
The East China Sea ◽  
Stable Isotopic ◽  
Short And Long Term

Describing feeding habits of cetaceans is crucial to understanding their feeding strategies and conservation status. Here, both morphological and molecular techniques were employed to identify the stomach contents of 122 finless porpoises (Neophocaena spp.) in the East China Sea for insight into their short-term feeding habits, and stable isotopes of δ13C and δ15N were used to analyze prey resource use and trophic position as a manifestation of their long-term feeding habits. In total, 33 prey species consisting of 19 teleosts, seven crustaceans, five cephalopods, and two gastropods were identified. In both short- and long-term analyses, teleosts represented primary prey, cephalopods and crustaceans were secondary prey, and gastropods were occasional prey; but the primary prey species composition differs between the short- and long-term diets. The composition of stomach contents showed sexual and age-related variation. This finding is supported by stable isotopic analyses, which indicated the separation of trophic position of adult males, adult females, and young males. In general, finless porpoises prey on species that are primarily caught by fisheries.

scholarly journals On the feeding habit of the Guiana Dolphin Sotalia guianensis (van Bénedèn, 1864) (Mammalia: Cetartiodactyla: Delphinidae) in southeastern Brazil (~220S): has there been any change in more than two decades?

2017 ◽  
Vol 9 (2) ◽  
pp. 9840 ◽  
Author(s):  
Ana Paula Madeira Di Beneditto ◽  
Clara Da Cruz Vidart Badia ◽  
Salvatore Siciliano
Keyword(s):  
Prey Species ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Southeastern Brazil ◽  
Feeding Preferences ◽  
Sotalia Guianensis ◽  
The North ◽  
Trichiurus Lepturus ◽  
Janeiro State ◽  
Guiana Dolphin

Along the north and central coast of Rio de Janeiro State (22025’S–23000’S), southeastern Brazil, the Guiana Dolphin Sotalia guianensis forages on neritic prey, mainly fish.  From the analysis of the dolphin’s stomach contents and the identification of partially digested prey, it was verified that the most frequent prey species were young specimens of Trichiurus lepturus.  Comparing our results with previous studies on the feeding habits of Guiana Dolphin in the same region, we noticed the maintenance of its feeding preferences during more than two decades, indicating little or no change in the use of prey by this top predator. 

Observations on feeding habits of the common dolphinfish, Coryphaena hippurus (Linnaeus 1758) from the western Bay of Bengal

2021 ◽  
Vol 34 ◽  
pp. 24
Author(s):  
Shubhadeep Ghosh ◽  
Satishkumar Mamidi ◽  
Manas Hoshalli Munivenkatappa ◽  
Prathibha Rohit ◽  
Abdussamad Eruppakkottil Median ◽  
...  
Keyword(s):  
Bay Of Bengal ◽  
Prey Species ◽  
Niche Breadth ◽  
Feeding Habits ◽  
Weight Ratio ◽  
Primary Study ◽  
Feeding Intensity ◽  
Coryphaena Hippurus ◽  
Dietary Niche ◽  
Western Bay Of Bengal

Coryphaena hippurus is a large pelagic species and constitutes an important by-catch in drift gillnet, trolling and long-line fishing gears operated along the Bay of Bengal, northeastern Indian Ocean. The present study, first from the region, is aimed at deciphering the feeding dynamics from 1150 individuals collected from 2017 to 2019. 32.17% of the fishes had empty stomachs or was with food traces, 45.57% had partially-full stomachs and 22.26% had full stomachs. The feeding intensity was inferred through stomach filling and predator-prey weight ratio, which was higher in May and lower in January, and increasing as increase in the fish size. Coryphaena hippurus is considered a piscivorous pelagic predator as pelagic teleosts contribute more than half of the prey species. Major prey species were big-eye scad (27.3%), squid (10.3%), crabs (9.3%), Indian mackerel (7.2%), Indian scad (5.9%), whitebaits (5.7%) and sardines (5.4%). Scads and crabs were abundantly preyed during summer and winter, while clupeids and engraulids in monsoon; however, no significant variations were observed in prey composition between sizes. Trophic Level was 4.22 ± 0.15 and Levins Standardized Niche Breadth Index was 0.30. Dietary niche breadth was higher during summer (0.48) and monsoon (0.33) and in fishes measuring 60.0–74.9 cm (0.51) and below 45.0 cm (0.48) indicating generalised feeding. This primary study from Bay of Bengal is the first comprehensive report on trophodynamics for the species and would contribute to its management using trophic interactions.

Feeding and distribution of the bigeye flounder Hippoglossina macrops off Northern Chile

2001 ◽  
Vol 52 (6) ◽  
pp. 833 ◽  
Author(s):  
J. C. Villarroel ◽  
E. H. Acuña ◽  
M. J. Andrade
Keyword(s):  
Feeding Habits ◽  
Stomach Contents ◽  
Fishing Ground ◽  
Intake Rate ◽  
Distributional Pattern ◽  
Age Classes ◽  
Feeding Intensity ◽  
Cephalothorax Length ◽  
A Minor ◽  
Squat Lobsters

Bathymetric distribution and stomach contents of the bigeye flounder captured during November 1995 were analysed. Bathymetric distributional pattern differed among age classes, with younger fish inhabiting shallower waters while older fish occupied all depths sampled. For each sex, the densities were greatest at shallower depths and decreased constantly with depth. Differences in feeding habits with fishing ground, depth and age classes were found. Feeding is characterized by consumption of juvenile squat lobsters Pleuroncodes monodon and Cervimunida johni of 3 mm mean cephalothorax length at 150–300 m depth, and primarily of shrimp Heterocarpus reedi below this range. Young flounders (≤3 years) mainly fed on small prey such as juvenile squat lobsters, whereas flounders >3 years old fed mainly on macrocrustaceans such as H. reedi and to a minor extent on P. monodon and C. johni. Feeding intensity increased with age for each sex, with older females showing a larger food intake rate that was consistent with their higher growth rate in comparison with males.

scholarly journals Reproduction and feeding habits of the River Catfish Eutropiichthys vacha (Hamilton, 1822) (Siluriformes, Schilbidae) in an impacted habitat: Kotri hydrodam, River Indus, Pakistan

Our Nature ◽  
2013 ◽  
Vol 10 (1) ◽  
pp. 269-280 ◽  
Author(s):  
Anila Naz Soomro ◽  
Wazir Ali Baloch ◽  
Sayed Iftikhar Hussain Jafri ◽  
Ghulam Hussain Burdi ◽  
Bernerd Fulanda
Keyword(s):  
Feeding Habits ◽  
Gonadal Development ◽  
Temporal Variations ◽  
Cold Season ◽  
Male Dominance ◽  
Minimum Size ◽  
Gut Contents ◽  
Feeding Intensity ◽  
Dietary Shift ◽  
River Indus

Reproduction and feeding habits of Eutropiichthys vacha were studied in Kotri hydrodam, a man-made and human impacted stretch of the Indus River, Pakistan during 2005-2006. A total 303 specimens were sampled and analyzed for maturity stages and gonadal development and food and feeding habits assessed from gut contents. Results showed male dominance over females: sex ratio 1.16:1.0. Minimum size at sexual maturity was 13.9 cm total length (TL). Mean fecundity ranged 1.38x104 to 2.17 x 105. Gonado-somatic index (GSI) was 0.1-2.5 and 0.3-6.5 for males and females, respectively. Highest GSIs were recorded in April. We observe an ontogenic dietary shift in E. vacha: young are omnivorous with insects dominating diet while adults are omni-piscivores with Puntius ticto accounting for 35.4% of species. Other species were Colisa spp., juveniles of Channa spp. and some cyprinids. Feeding intensities were lowest in April at peak of spawning. The intensities increase rapidly after spawning indicating voracious feeding in E. vacha. Feeding intensities in adults are low during the cold season. These results provide for assessment of spatial-temporal variations in feeding intensity in E. vacha while GaSI and diet composition reveal information on environmental shifts and ecosystem fluctuations in the impacted habitats of the River Indus for sound fisheries management.DOI: http://dx.doi.org/10.3126/on.v10i1.7795

Feeding habits of Urotrygon microphthalmum (Myliobatiformes: Urotrygonidae) caught off northeastern Brazil

2021 ◽  
Vol 19 (4) ◽  
Author(s):  
Jones Santander-Neto ◽  
Dante J. V. Freitas ◽  
Hugo Bornatowski ◽  
Rosângela Lessa
Keyword(s):  
Trophic Level ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Critically Endangered ◽  
Northeastern Brazil ◽  
Diet Shift ◽  
Ontogenetic Diet Shift ◽  
Food Items ◽  
Males And Females ◽  
Stomach Contents Analysis

Abstract The feeding habits of Urotrygon microphthalmum, a Critically Endangered (CR) species, were investigated through stomach contents analysis from specimens caught on bottom double rigged otter trawls in Pernambuco state, Brazil, between March of 2010 and March of 2012. A total of 338 stomachs were analyzed, and 31 food items were identified in the diet of U. microphthalmum. The species ingests mainly shrimps. The diets between males and females were not different, and an ontogenetic diet shift was not observed. The estimated species’ trophic level is 3.5, classifying it as a secondary order consumer.

Food composition and feeding habits of little tunny (Euthynnus alletteratus) in continental shelf waters of Côte d'Ivoire (West Africa)

2007 ◽  
Vol 64 (5) ◽  
pp. 1044-1052 ◽  
Author(s):  
Laurent Bahou ◽  
Tidiani Koné ◽  
Valentin N'Douba ◽  
Kouassi J. N'Guessan ◽  
Essetchi P. Kouamélan ◽  
...  
Keyword(s):  
West Africa ◽  
Continental Shelf ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Feeding Habits ◽  
Fork Length ◽  
Stomach Contents ◽  
Food Composition ◽  
Cote D’Ivoire ◽  
Côte D'ivoire

Abstract Bahou, L., Koné, T., N'Douba, V., N'Guessan, K. J., Kouamélan, E. P., and Gouli, G. B. 2007. Food composition and feeding habits of little tunny (Euthynnus alletteratus) in continental shelf waters of Côte d'Ivoire (West Africa). – ICES Journal of Marine Science, 64: 1044–1052. The stomach contents of 170 little tunny, Euthynnus alletteratus, sampled between June 2003 and December 2004 were examined. Fish size ranged from 27 to 81 cm fork length, and all fish were caught in gillnets deployed over the continental shelf off Côte d'Ivoire (West Africa). The type and quantity of prey ingested changed seasonally. Outside the major upwelling period the diet was more varied. Overall, fish were the dominant prey of all sizes of little tunny, far exceeding crustaceans, of which shrimps and prawns were commonest but were not found in the stomachs of juveniles (<42 cm FL) or larger adults (≥53 cm FL). Little tunny are carnivorous fish that feed opportunistically. A relationship was found between the size of the prey and the size of the predator.

scholarly journals FEEDING HABITS OF Lutjanus synagris (TELEOSTEI: LUTJANIDAE) IN THE AMAZON COAST OF THE NORTHEAST REGION OF BRAZIL

2021 ◽  
Vol 46 (4) ◽  
Author(s):  
Jackellynne Fernanda Farias FERNANDES ◽  
Jailza FREITAS ◽  
Yago Bruno Silveira NUNES ◽  
Rafael Santos LOBATO ◽  
Marina Bezerra FIGUEIREDO
Keyword(s):  
Feeding Habits ◽  
Stomach Contents ◽  
Food Composition ◽  
Relative Importance ◽  
Abiotic Conditions ◽  
Ecological Index ◽  
Food Items ◽  
Synthetic Materials ◽  
Spatial Differences ◽  
The Relationship

The feeding habit of lane snapper Lutjanus synagris was analyzed qualitatively and quantitatively, related to seasonality, its ontogenetic development, and the relationship between food and biotic and abiotic conditions on the Amazon Coast of Maranhão, between June 2018 and May 2019. Numerical, gravimetric, and ecological index methods were used to show the relative importance or preference of a category or food item in the diet. The food composition was studied related to the sex, size of the predator and seasonality. Of 359 stomachs sampled, 54 were empty due to regurgitation and presented a vacuity coefficient (Cv%) of 15.04%. In the analysis of diets between the sexes, it was possible to identify a greater participation of fish (30.43%) and Crabs (26.10%) for females, Shrimp (36.23%) and Organic Matter Not Identified (OMNI) (18.84%) in males. The diet showed spatial differences in length distributions. The analysis of stomach contents showed the presence synthetic materials (mesoplastics ranging from 5.0 mm to 2.5 cm) in 5.52% of the samples. The main food items found were from the Brachyura and Caridea species. The results clearly demonstrate that lane snapper prefers benthic prey, presenting a carnivorous and generalist-opportunistic habit. Its diet is also composed of demersal-pelagic species, such as Cephalopods and Teleost fish.

Sign in / Sign up

Export Citation Format

Share Document