Alteration of the feeding behavior of an omnivorous fish, Scardinius acarnanicus (Actinopterygii: Cypriniformes: Cyprinidae), in the presence of fishing lights

Fishing with light is an old and common practice yielding a substantial catch volume globally. Despite the popularity of the method and the efforts to improve it, there is a lack of field studies on the effects of light on the feeding preferences of the attracted fishes. A previous report suggested that purse seine fishing lights can differentiate the feeding preferences of the approaching fishes, such as Atherina boyeri Risso, 1810 in Lake Trichonis (Greece). The presently reported study aims to verify these findings by investigating the diet of the endemic Scardinius acarnanicus Economidis, 1991. The feeding behavior of S. acarnanicus was studied from 2016 to 2019 through gut content analysis, in specimens from Lake Trichonis that came from purse seining with light and specimens caught without light. The same investigation was carried out comparatively in specimens taken by gillnets from two nearby lakes (lakes Ozeros and Amvrakia), where S. acarnanicus is present, but no fishing with light is exercised. The stomach content analysis conducted on 699 S. acarnanicus specimens revealed the intense effect of light on its diet resulting in the alteration of its feeding habits towards fish predation and especially Atherina boyeri. On the contrary, the specimens taken with the use of gillnets, from the three lakes, showed a typical omnivorous feeding behavior. The findings of the presently reported study support the assumption that the elevated concentration of fish close to fishing lights alters the feeding behavior of certain species making them predators. Considering that fishing with light is practiced worldwide, this could be of great ecological significance to the ichthyofauna not only of inland waters but also of marine areas, affecting perhaps several commercial species.

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Alteration of the feeding behavior of an omnivorous fish, Scardinius acarnanicus (Actinopterygii: Cypriniformes: Cyprinidae), in the presence of fishing lights

Acta Ichthyologica Et Piscatoria ◽

10.3897/aiep.51.e63299 ◽

2021 ◽

Vol 51 (2) ◽

pp. 131-138

Author(s):

Lambros Tsounis ◽

George Kehayias

Keyword(s):

Content Analysis ◽

Feeding Behavior ◽

Feeding Habits ◽

Fish Predation ◽

Field Studies ◽

Stomach Content Analysis ◽

Elevated Concentration ◽

Feeding Preferences ◽

Reported Study ◽

Commercial Species

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Feeding habits of the Cichlid Chromidotilapia guntheri (Sauvage, 1882) in some hydrosystems of Ivory Coast

Aquatic Science and Technology ◽

10.5296/ast.v6i1.12511 ◽

2018 ◽

Vol 6 (1) ◽

pp. 18

Author(s):

Charles Koffi BOUSSOU ◽

Gustave N’guessan ALIKO ◽

Mexmin Koffi KONAN ◽

Felix Koffi KONAN

Keyword(s):

Content Analysis ◽

Stomach Content ◽

Ivory Coast ◽

Feeding Habits ◽

Feeding Strategy ◽

Stomach Content Analysis ◽

Trophic Niche ◽

Feeding Habit ◽

Ontogenetic Shift ◽

It Practices

The feeding habit of Chromidotilapia guntheri was investigated in seven hydrosystems of Ivory Coast. The contents of 156 non-empty stomachs were examined from specimens caught in the rivers Soumié, Eholié, Noé, Ehania and Banco, the Bea rill and the Kpoda lake. Diets composition, feeding strategy and trophic niche width were analyzed among hydrosystems. Stomach content analysis indicated that C. guntheri feeds preferentially on plants and insects debris and secondarily, it consumed insects’ larvae, nymphs and adults in all habitats. This species would be an omnivorous with a detritivorous tendency. As feeding strategy, it practices a generalist strategy even if some individuals displayed specialization intentions on insects at different stages of metamorphosis. Investigations on ontogenetic shift revealed that juveniles and adults of C. guntheri consume substantially the same types of prey with varying amounts depending on the size of the fish. However there is a significant decrease in the proportions of gastropods and oligochaetes ingested when growing.

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STOMACH CONTENT ANALYSIS OF SOME SELECTED FISH SPECIES FROM GILIMA RIVER, TAURA LOCAL GOVERNMENT, JIGAWA STATE, NIGERIA.

JOURNAL OF ADVANCES IN AGRICULTURE ◽

10.24297/jaa.v4i3.4277 ◽

2015 ◽

Vol 4 (3) ◽

pp. 455-459

Author(s):

Auwalu Haruna

Keyword(s):

Content Analysis ◽

Stomach Content ◽

Oreochromis Niloticus ◽

Feeding Habits ◽

Stomach Content Analysis ◽

Frequency Of Occurrence ◽

Plant Materials ◽

Dietary Preference ◽

Lates Niloticus ◽

Food And Feeding

Four hundred (400) samples comprising eighty (80) samples each from five different species of Oreochromis niloticus, Bagrus bayad, Lates niloticus, Hydrocynus brevis and Synodontis vermiculatus were collected in batches using gill nets from 24th March -16th September, 2014; food and feeding habits were then assessed by analyzing the stomach content. The samples ranged in size from 525cm total length and 4.745g in weight. The stomach content analysis using frequency of occurrence method revealed that Oreochromis niloticus were herbivorous with dietary preference for plants and plant materials (47.27%), detritus (23.21%) and unidentifiable materials (6.06%), Bagrus bayad as carnivorous with dietary preference for fishes (52.17%), insects (23.57%), detritus (7.50%), Lates niloticus were also carnivorous with fishes (62.00%), fish parts (31.30%), insects (4.6%), Hydrocynus brevis proved carnivorous with dietary preference for fishes (42.16%), fish parts (17.83%), and Synodontis vermiculatus as an omnivore with dietary preference of plant materials (18.71%), fishes (12.69%), insect (12.19%) and detritus (17.48%).

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Feeding habits and behaviour of Bagre bagre and Genidens barbus, two ariid catfishes (Pisces: Siluriformes) from southeastern Brazil

Journal of Threatened Taxa ◽

10.11609/jott.3758.9.10.10771-10775 ◽

2017 ◽

Vol 9 (10) ◽

pp. 10771 ◽

Cited By ~ 4

Author(s):

Maria Thereza Manhães Tavares ◽

Ana Paula Madeira Di Beneditto

Keyword(s):

Content Analysis ◽

Stomach Content ◽

Prey Species ◽

Feeding Habits ◽

Stomach Content Analysis ◽

Southeastern Brazil ◽

Commercial Fisheries ◽

Main Prey ◽

Trichiurus Lepturus ◽

Xiphopenaeus Kroyeri

The feeding habits and behaviour of adult specimens of Bagre bagre (Linnaeus, 1766) and Genidens barbus (Lacepède, 1803), both targets of commercial fisheries in coastal southeastern Brazil, were evaluated through stomach content analysis. These catfish are generalistic benthophagous feeders and daytime consumers, and the analysis points to fish and crustaceans as their primary prey. The fish Trichiurus lepturus and the shrimp Xiphopenaeus kroyeri were the main prey species, indicating that both catfish species prey upon the most abundant resources available in the study area.

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Observations on the diet and feeding habits of the epaulette shark, Hemiscyllium ocellatum (Bonnaterre), on Heron Island Reef, Great Barrier Reef, Australia

Marine and Freshwater Research ◽

10.1071/mf97026 ◽

1998 ◽

Vol 49 (7) ◽

pp. 753 ◽

Cited By ~ 28

Author(s):

M. R. Heupel ◽

M. B. Bennett

Keyword(s):

Content Analysis ◽

Reef Flat ◽

Prey Capture ◽

Feeding Habits ◽

Stomach Content Analysis ◽

Relative Importance ◽

Barrier Reef ◽

Epaulette Shark ◽

Index Of Relative Importance ◽

Prey Items

The diet and feeding habits of the epaulette shark, Hemiscyllium ocellatum, were investigated through stomach content analysis. Five groups of prey items were found. The index of relative importance showed worms and crabs to be of greatest value at 51.3% and 40.1% respectively. The three minor prey groups were shrimps (7.7%), small fishes (0.7%) and amphipods (0.3%). Epaulette sharks tend to be crepuscular, although feeding bouts may occur at any time. They appear to be opportunistic predators, using olfaction and electroreception in prey capture. This species appears to be an important benthic predator in the reef flat environment on Heron Island Reef.

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Diet of two Antarctic dragonfish (Pisces: Bathydraconidae) from the Indian sector of the Southern Ocean

Antarctic Science ◽

10.1017/s095410209800008x ◽

1998 ◽

Vol 10 (1) ◽

pp. 55-61 ◽

Cited By ~ 6

Author(s):

Evgeny A. Pakhomov

Keyword(s):

Content Analysis ◽

Feeding Habits ◽

Euphausia Superba ◽

Stomach Content Analysis ◽

Mesopelagic Fish ◽

Depth Range ◽

The Family ◽

Competition For Food ◽

Cosmonaut Sea ◽

Indian Sector

The diet of Cygnodraco mawsoni Waite 1916 and Gymnodraco acuticeps Boulenger 1902 (Pisces: Bathydraconidae) was studied in the Cooperation and Cosmonaut seas in the depth range 200–400 m during the summer 1988. Stomach content analysis showed that both species are piscivorous predators but with different feeding habits. Cygnodraco mawsoni fed mostly on young notothenioid fish, regularly complementing these with pelagic, Euphausia superba, and benthic crustaceans, such as amphipod gammarids and mysids. In contrast, G. acuticeps relied mostly on mesopelagic fish of the family Myctophidae. Although C. mawsoni and G. acuticeps occupy similar depths in the Cosmonaut Sea, different feeding habits appear to limit the probability of interspecific competition for food.

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Diet of Leptobotia elongata revealed by stomach content analysis and inferred from stable isotope signatures

Environmental Biology of Fishes ◽

10.1007/s10641-015-0414-4 ◽

2015 ◽

Vol 98 (8) ◽

pp. 1965-1978 ◽

Cited By ~ 4

Author(s):

L. Li ◽

Q. Wei Wei ◽

J. Ming Wu ◽

H. Zhang ◽

Y. Liu ◽

...

Keyword(s):

Content Analysis ◽

Stable Isotope ◽

Stomach Content ◽

Stomach Content Analysis ◽

Stable Isotope Signatures

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Functional morphology of the mouthparts and proventriculus of the rock crab Nectocarcinus tuberculosus (Decapoda: Portunidae)

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315403007859h ◽

2003 ◽

Vol 83 (4) ◽

pp. 821-834 ◽

Cited By ~ 14

Author(s):

Indra Raymond Salindeho ◽

Danielle Jane Johnston

Keyword(s):

Content Analysis ◽

Stomach Content ◽

Stomach Content Analysis ◽

Distal Region ◽

Proximal Region ◽

Rocky Shores ◽

Brachyuran Crab ◽

Cardiac Stomach ◽

Dietary Preferences ◽

Sea Grass

Mouthpart and proventriculus structure of the brachyuran crab Nectocarcinus tuberculosus was described by scanning electron microscopy and histology and characteristics indicative of dietary preferences were identified. A qualitative stomach content analysis was conducted to verify structural interpretations with respect to diet. The mouthparts and proventriculus of N. tuberculosus have features that are typical of macrophagous crabs and are consistent with a carnivorous diet of hard items. However, the mandibular arrangement indicates that N. tuberculosus is also adapted to ingest soft plant material and fleshy items, revealing that this crab is omnivorous which is consistent with its habitat of rocky shores and sea grass beds. Carnivorous features of the feeding apparatus include large crista dentata on the third maxillipeds that grip food items during ingestion and cuspidate setae on the second maxillipeds and first maxillae. Nectocarcinus tuberculosus has a complex arrangement of proventricular ossicles, 5-denticulated accessory teeth, and a spiny cardio-pyloric valve with rough, calcified protuberances. It has a robust, strongly calcified gastric mill with a prominent anterior cusp and 11 roughly surfaced vertical ridges on each lateral tooth specialized for crushing and grinding. In contrast to true carnivorous crabs, the mandibles in this species are symmetrically arranged, with two sharp cutting edges and no teeth, an arrangement adapted to cut softer plant-like materials and flesh. Structural interpretations with respect to diet were confirmed by stomach content analysis where items identified included gastropods, bivalves and the sea grass Posidonia australis. Functionally, the filtering system in the proventriculus of N. tuberculosus is complex. The cardiac stomach has a well developed ventral filtration system or ‘cardiac filter’ which comprises coarse and fine filters. Different modifications of setation between the distal and proximal regions of the inner valve of the pyloric filter are unique to this crab species, with an intersetule width 600 nm in the distal region and 80–100 nm in the proximal region. This suggests that some differentiation in filtration occurs between regions within the pyloric filter.

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FEEDING HABITS AND HELMINTH PARASITES OF SARDINE (S. PILCHARDUS) AND ANCHOVY (E. ENCRASICOLUS) IN THE ADRIATIC SEA

Mediterranean Marine Science ◽

10.12681/mms.1467 ◽

2015 ◽

Vol 17 (1) ◽

pp. 216 ◽

Cited By ~ 3

Author(s):

B. ZORICA ◽

V. ČIKES KEČ ◽

O. VIDJAK ◽

I. MLADINEO ◽

D. EZGETA BALIČ

Keyword(s):

Diet Composition ◽

Feeding Habits ◽

Stomach Contents ◽

Stomach Content Analysis ◽

Helminth Parasites ◽

Significant Difference ◽

Prey Composition ◽

One Year ◽

Paratenic Hosts ◽

Hysterothylacium Aduncum

We examined the stomach contents of two of the most economically and ecologically important small pelagic fish species, the sardine, Sardina pilchardus and the anchovy, Engraulis encrasicolus, obtained monthly from commercial purse-seine catches operating on Croatian fishing grounds during a one-year period (January–December, 2011). Both species generally showed a similar diet, with copepod and decapod larvae as dominant prey groups. The composition of anchovy and sardine stomach contents was not size- or sex-related, but throughout the year, a significant difference in diet composition was observed for each species as well as between species. Two gastrointerstinal helminths; the digenean Parahemiurus merus and nematode Hysterothylacium aduncum, were recorded during the stomach content analysis. Differences in population dynamics between the two parasites are congruent with differences in the prey composition of sardine and anchovy, reflecting fine-tuned interactions in the trophic web between parasites and intermediate or paratenic hosts included in the sardine and anchovy diet.

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ANALISIS ISI LAMBUNG IKAN CAKALANG (Katsuwonus pelamis) DAN IKAN MADIDIHANG (Thunnus albacares) YANG DIDARATKAN DI BITUNG, SULAWESI UTARA

Jurnal Penelitian Perikanan Indonesia ◽

10.15578/jppi.14.2.2008.227-235 ◽

2017 ◽

Vol 14 (2) ◽

pp. 227

Author(s):

Siti Mardlijah

Keyword(s):

Content Analysis ◽

Stomach Content ◽

Sampling Site ◽

Stomach Content Analysis ◽

Small Scale ◽

Thunnus Albacares ◽

Dietary Composition ◽

Skipjack Tuna ◽

Katsuwonus Pelamis ◽

North Sulawesi

Penelitian ini telah dilakukan terhadap isi lambung ikan cakalang (Katsuwonus pelamis) hasil tangkapan pole and line dan ikan madidihang (Thunnus albacares) hasil tangkapan hand line yang didaratkan di Bitung, Sulawesi Utara pada bulan Mei, Juli, dan September 2005. Penelitian ini bertujuan untuk mengetahui komposisi jenis makanan ikan cakalang (Katsuwonus pelamis) dan ikan madidihang (Thunnus albacares). Contoh ikan cakalang (Katsuwonus pelamis) berjumlah 69 ekor dan contoh ikan madidihang (Thunnus albacares) berjumlah 63 ekor. Pengambilan contoh dilakukan di perusahaan perikanan dan tempat pengasapan atau fufu cakalang. Pengamatan dilakukan secara visual dan gravimetrik kemudian dianalisis dengan metode indeks of preponderance. Hasil penelitian menunjukkan bahwa komposisi makanan ke-2 jenis ikan pelagis besar tersebut berubah-ubah dan memiliki kemiripan terhadap 1 jenis makanan yaitu ikan malalugis (Decapterus macarellus), yang merupakan makanan utama ikan cakalang (Katsuwonus pelamis) dan ikan madidihang (Thunnus albacares). Stomach content analysis of skipjack tuna (Katsuwonus pelamis) which was caught by pole and line and yellow fin tuna (Thunnus albacares) caught by hand line, landed in Bitung, North Sulawesi i May, July, and September 2005 were conducted. The objective of the experiment is to know dietary composition of skipjack tuna (Katsuwonus pelamis) and yellow fin tuna (Thunnus albacares). The number of specimen observed 69 of skipjack tunas (Katsuwonus pelamis) and 63 of yellow fin tunas (Thunnus albacares). Sampling site were located in fishery company and at a small scale fish smoked industry. Stomach content analysis of the two fishes were observed visually measured and gravimetrically. The stomach content analysis was analysed based on indeks of preponderance) method. Result shows, the stomach content of skipjack tuna (Katsuwonus pelamis) and yellow fin tuna (Thunnus albacares) related changes and similar among one species are scad mackerel fishes (Decapterus macarellus). Therefore, scad mackerel fishes (Decapterus macarellus) is the dominant food for both skipjack tuna (Katsuwonus pelamis) and yellow fin tuna (Thunnus albacares).

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