Feeding habit and diet composition of Glossogobius aureus Akihito & Meguro, 1975 in the Vietnamese Mekong Delta

Background:Schizothorax plagiostomus is widely distributed in river Indus and is most important food fish in Pakistan. The feeding habit of fish is directly related to the size of fish, its metabolic rate and environmental temperature. The accurate description of fish diet and feeding habit is a very important aspect in fisheries management for the purpose of species conservation, breeding and culture. The present work was aimed to investigate the specie abundance, the diet composition and seasonal variations in the feeding habit of Snow barbell Schizothorax plagiostomus.Materials, Methods & Results: A total of 1799 fish specimens were caught at the confluence of six tributaries along river Indus at Indus Kohistan, northeastern Pakistan. The fish were collected by 5-panels of gill net during first week of each month. The site specific Catch Per Unit Effort (CPUE) and season specific CPUE of fish fauna were assessed. For the gut content analysis 240 samples (99 male and 141 females) of S. plagiostomus were selected on monthly basis. Frequency of occurrence method and volumetric method were applied to record the different food items in the gut of S. plagiostomus. The physico-chemical parameters, NO3 concentration and dissolved Co2 of water from different localities of river Indus were recorded month wise by Hach sensION 156 meter, Horiba LAQUA Nitrate Meter and EA80 meter respectively. Significant difference was observed in water temperature during the four seasons. Except alkalinity no other water parameter showed significant variation across different localities. The results showed that highest Mean CPUE was observed for Darel Stream (0.55) and lowest for Jalkot stream (0.26). Peak abundance of fish was recorded in the month of November with a mean catch of 44.50, mean CPUE of 0.74 and mean Kruskal-Wallis rank value of 63.25. Spirogyra and Ulothrix occurred as maximum food items in the gut of S. plagiostomus during summer while their minimum amount occurred during autumn. According to the ranking index spirogyra and ulothrix ranked higher with significant difference in comparison to other food items. The results showed that S. plagiostomus is phytophagous in its feeding habit, which consumed mainly algae attached to stones and pebbles during the whole year. However, the presence of some secondary items such as animal matter, detritus, sand and mud might be due to the distinct availabilities of food along the seasons. The highest feeding activity of S. plagiostomus was recorded during summer while the lowest one occurred during autumn, spring and winter. Discussion: Catch per unit effort (CPUE) is an indirect measure of the abundance of a target species. It is used as an index of stock abundance in fisheries and conservation biology. During the study low fish fauna was found in River Indus as reported previously. Majority of the fish occurred in snow fed river tributaries in the study area as these tributaries are comparatively less turbulent. Previous studies have also recorded that Schizothoracine generally prefer clean waters. The present findings of gut contents analysis showed clearly that S. plagiostomus is a phytophagous fish which scrap and consumed spirogyra and ulothrix attached to stones and pebbles. Earlier it was reported that mouth of S. plagiostomusis is inferior, wide, with deep lower jaw having keratinized cutting edge and the lower lip is folded and expanded with numerous papillae making it best suited for scrapping algae attached to stones and pebbles. The highest feeding activity was observed during warmer months as compared to cold months. S. plagiostomus spawn twice in a year in autumn and in spring. The highest feeding activity of S. plagiostomus seems to be link with a reflex of recovery strategy due to physiological process of gonadal development.

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Food and feeding habits of the exotic fish Oreochromis mossambicus (Peters, 1852) from a tropical reservoir of Chalakudy River, Kerala

Indian Journal of Fisheries ◽

10.21077/ijf.2016.63.4.56096-21 ◽

2016 ◽

Vol 63 (4) ◽

Author(s):

K. Roshni ◽

C. R. Renjithkumar ◽

B. Madhusoodana Kurup

Keyword(s):

Diet Composition ◽

Feeding Habits ◽

Oreochromis Mossambicus ◽

Feeding Habit ◽

Gut Content Analysis ◽

Gut Content ◽

Tropical Reservoir ◽

Exotic Fish ◽

Plant Matter ◽

Food And Feeding

The diet composition of the exotic fish, Oreochromis mossambicus (Peters, 1852) was studied in Poringalkuthu Reservoir, Kerala from June 2011 to May 2012. O. mossambicus (2.52 t) forms a regular fishery which indicate that the fish has been established successfully in the reservoir. Gut content analysis revealed detritus to be the dominant food item followed by chlorophyceae, cyanophyceae, bacillariophyceae, zooplankton, plant matter, sand particles, fish parts, insects and miscellaneous items. The present study shows that the species is an omnivore, with a euryphagous feeding habit.

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Makanan ikan seriding, Ambassis nalua (Hamilton, 1822) di Teluk Pabean, Jawa Barat [Diet of scalloped perchlet, Ambassis nalua (Hamilton, 1822) in Pabean Bay, West Java]

Jurnal Iktiologi Indonesia ◽

10.32491/jii.v17i1.303 ◽

2017 ◽

Vol 17 (1) ◽

pp. 45 ◽

Cited By ~ 1

Author(s):

Eda Putri Santi ◽

M. F. Rahardjo ◽

NFN Sulistiono

Keyword(s):

Stomach Content ◽

Diet Composition ◽

Feeding Habit ◽

Estuarine Fish ◽

Fish Length ◽

West Java ◽

Fish Samples

The objective of the present study was to describes the diet of scalloped perchlet (Ambassis nalua) based on the time and fish length. This study was conducted from July to December 2015 in Pabean Bay, Indramayu. The fish were collected monthly in three zones i.e. at the mouth of river, midle and out of estuarine. Fish samples were collected using trammelnet and trapnet. The index of preponderance was used to analysis the diet composition of the fish. The stomach content of a total of 407 fish samples of 283 females, 118 males, and 6 juveniles were analyzed. The analysis showed the scalloped perchlet fed on crustaceans, juvenile of fish, isopod, and amphipod, indicate a carnivorous feeding habit. The crustaceans was the main for item of scalloped perchlet AbstrakPenelitian ini bertujuan untuk menganalisis jenis makanan ikan seriding (Ambassis nalua) menurut waktu dan ukuran panjang ikan. Penelitian dilaksanakan di perairan Teluk Pabean, Indramayu dari bulan Juli hingga Desember 2015. Penangkapan ikan dilakukan pada tiga zona, yaitu bagian dalam yang berupa muara sungai, bagian tengah, dan bagian luar estuari dengan interval satu bulan. Alat tangkap yang digunakan adalah sero dan jaring. Analisis makanan menggunakan Indeks Bagian Terbesar. Jumlah ikan seriding yang diamati saluran pencernaannya adalah 407 ekor dengan komposisi betina 283 ekor, jantan 118 ekor, dan yuwana 6 ekor. Ikan seriding merupakan ikan karnivora dengan menu makanan terdiri atas empat kelompok organisme yaitu krustase, yuwana ikan, amfipoda, dan isopoda. Ikan seriding menunjukkan menu makanan utama yang sama yaitu krustase baik berdasarkan waktu maupun ukuran ikan.

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Diet composition of Plagioscion squamosissimus (Heckel, 1840), a fish introduced into the Tietê River system

Brazilian Journal of Biology ◽

10.1590/s1519-69842009000400007 ◽

2009 ◽

Vol 69 (3) ◽

pp. 805-812 ◽

Cited By ~ 6

Author(s):

PM. Stefani ◽

O. Rocha

Keyword(s):

Aquatic Insects ◽

Amazon Basin ◽

Diet Composition ◽

Feeding Habits ◽

River System ◽

Similarity Coefficient ◽

Feeding Habit ◽

Ontogenetic Changes ◽

Taxonomic Level ◽

Tietê River

Plagioscion squamosissimus is a species from the Amazon basin that was introduced into the Tietê River system. The present study aimed to analyse the feeding habits of this species in Bariri Reservoir and to verify the possible occurrence of ontogenetic changes in its diet composition. The samples were gathered in four periods of the year: February, June, September and November 2003. The fish were gathered with different fishing net meshes in three different reservoir portions. The alimentary items found in the stomachs were identified to the lowest possible taxonomic level and had abundance, occurrence frequency, volume and biomass determined. The Alimentary Index (IAi) was calculated for each alimentary item consumed by "corvina" for each studied period. Comparisons among the diet of different size classes of P. squamosissimus were done using the similarity coefficient of Jaccard and the Cluster Analysis (UPGMA). The Friedman proof was performed to verify if there is a significant ontogenetic variation in the species diet and changes in the consumption of different alimentary categories by P. squamosissimus among the sampled periods. P. squamosissimus presented a piscivorous feeding habit, although other items were also consumed. The biggest values of IAi were obtained for the alimentary item fish in the months of June (0.47) and November (0.39). The item Ephemeroptera (Campsurinae) was the most representative in February (0.30) and June (0.45). Despite the fact that P. squamosissimus consumed an ample spectrum of alimentary items, the ontogenetic changes were evident through the exploration of aquatic insects by the younger classes and by a diet mainly composed of fish in adult individuals. The alimentary plasticity of P. squamosissimus evidenced in this study might have contributed to the success of this species in Bariri Reservoir.

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Foraging ecology of the amphibious mudskipper Periophthalmus chrysospilos (Gobiiformes: Gobiidae)

PeerJ ◽

10.7717/peerj.12582 ◽

2021 ◽

Vol 9 ◽

pp. e12582

Author(s):

Quang Minh Dinh ◽

Ton Huu Duc Nguyen ◽

Tran Thi Huyen Lam ◽

Tien Thi Kieu Nguyen ◽

Giang Van Tran ◽

...

Keyword(s):

Digestive Tract ◽

Intertidal Zone ◽

Diet Composition ◽

Foraging Ecology ◽

Feeding Strategy ◽

Mekong Delta ◽

Food Composition ◽

Food Items ◽

Marine Connectivity ◽

Dietary Component

The food composition and feeding ecology of fishes living in the intertidal zone play an essential role in understanding the energetic connectivity between terrestrial and aquatic systems. Periophthalmus chrysospilos is an amphibious fish species occurring in the intertidal zone, but data on its diet and foraging ecology is still poorly known. This study on Ps. chrysospilos was carried out from April 2020 to March 2021 at four sites within the Mekong Delta estuary to define the influence of spatio-temporal factors on the diet of this species. The diet composition and relative gut lengths (RGLs) of Ps. chrysospilos were analysed in relation to four parameters—sex, size, site, and season. A total of 1,031 individuals were collected, and their digestive tract lengths were used to calculate the RGL. The digestive tracts of only 546 individuals were with food items (approximately 1:1 of empty vs full digestive tract) and were subsequently used for further analyses. The ranges in total length and weight in both adult and juvenile individuals were 3.4–10.6 cm and 0.38–14.13 g, respectively. The RGL values varied with season, fish size and site, but was always lower than 1, indicating a predominantly carnivorous diet. The variability of food items found within the digestive tracts demonstrated its adaptability in pursuing prey items within the limits of the littoral zone, and its importance as a conduit of terrestrial-marine connectivity. This species is characterised as an opportunistic mesopredator feeding primarily on Acetes spp., Uca spp., Dolichoderus sp., and rarely on Polychaeta and Actinopterygii. Other items found within the digestive tract are Mollusca, and detritus. The diet composition of Ps. chrysospilos did not vary with season and size, but changed with sex and site parameters. Uca spp. contributed to the sexual variation in dietary component, whereas Mollusca, Uca spp., Dolichoderus sp. and detritus, were drivers for spatial variation in the dietary component. The research provides fundamental information on diet composition and feeding strategy, as well as contributes towards knowledge on foraging ecology and resource use by intertidal animal communities.

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Variation in diet composition of the mudskipper, Periophthalmodon septemradiatus, from Hau River, Vietnam

Bulletin of Marine Science ◽

10.5343/bms.2018.0067 ◽

2020 ◽

Vol 96 (3) ◽

pp. 487-500 ◽

Cited By ~ 2

Author(s):

Quang Minh Dinh ◽

Lam Thanh Tran ◽

Tuyet Thi Minh Tran ◽

Diem Kieu To ◽

Tien Thi Kieu Nguyen ◽

...

Keyword(s):

Data Analysis ◽

Diet Composition ◽

Food Item ◽

Mekong Delta ◽

Food Composition ◽

Carnivorous Fish ◽

Fish Size ◽

Fish Samples ◽

Males And Females ◽

Main Food Item

Periophthalmodon septemradiatus (Hamilton, 1822) is a mudskipper of the Mekong Delta that can be found along estuaries and lower reaches of rivers. In the present study, we determined diet and feeding ecology of this species by analyzing the contents within the stomachs of 1360 fish samples collected from August 2017 to July 2018. Data analysis suggested that P. septemradiatus is a carnivorous fish. We found six main food item categories: small fishes, prawns (Acetes spp.), crabs (Uca spp.), molluscs, ants (Dolichoderus sp.), and detritus. Both males and females at different sizes, seasons, and habitats ingest primarily Dolichoderus sp., secondarily detritus, and rarely other prey. Diet composition was similar between sexes but varied according to fish size, season, and habitat. Dolichoderus sp. and detritus regulate the spatial variation of food composition. Our findings contribute to future artificial cultivation for conservation.

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Sex differences on the feeding of the gobiid fish Bathygobius soporator in tide pools of Maiandeua Island, Pará, Brazil

Iheringia Série Zoologia ◽

10.1590/1678-4766e2016008 ◽

2016 ◽

Vol 106 (0) ◽

Cited By ~ 1

Author(s):

Bruno E. Soares ◽

Cleonice M. C. Lobato ◽

Danielly T. H. Freitas ◽

Roberta D. Oliveira-Raiol ◽

Luciano F. A. Montag

Keyword(s):

Sex Differences ◽

Diet Composition ◽

Multivariate Analyses ◽

Feeding Habit ◽

Occurrence Frequency ◽

Frequency Of Occurrence ◽

Gobiid Fish ◽

Males And Females

Abstract Bathygobius soporator (Valenciennes, 1837) is one of the most common fishes in tide pools in the estuary of Pará state, and has an omnivorous feeding habit. This study examined the diet of the species in Maiandeua Island, and aimed to: (i) describe the diet of B. soporator through indexes based on the occurrence and weight of consumed items; and (ii) evaluate if there is variation in diet composition between males and females. Frequency of Occurrence, frequency of weight and Alimentary Index were calculated for each item, and differences in the diet composition of males and females were observed through multivariate analyses (ANOSIM, NMDS and SIMPER). Bathygobius soporator presented carnivorous feeding habit, eating mainly crustaceans, and differences among males and females were observed, males consuming smaller amounts of crustaceans and including algae in their diet.

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Astyanax paranae Eigenmann, 1914 (Characiformes: Characidae) in the Alagados Reservoir, Paraná, Brazil: diet composition and variation

Neotropical Ichthyology ◽

10.1590/s1679-62252006000300006 ◽

2006 ◽

Vol 4 (3) ◽

pp. 349-356 ◽

Cited By ~ 18

Author(s):

Milza Celi Fedatto Abelha ◽

Erivelto Goulart ◽

Elaine Antoniassi Luiz Kashiwaqui ◽

Marlene Rodrigues da Silva

Keyword(s):

Diet Composition ◽

Feeding Habit ◽

Data Matrix ◽

Test Diet ◽

Terrestrial Invertebrates ◽

Food Items ◽

Plant Matter ◽

Time Space ◽

Feeding Spectrum ◽

One Way Anova

Aspects of the feeding ecology of a small characin, Astyanax paranae, were studied during 1996/1997 and 1998/1999 in the Alagados Reservoir, Paraná, Brazil (25º01'50.0'' S; 050º03'41.9'' W). Fishes were quarterly captured from the reservoir's riverine and lacustrine zones and stomachs contents of 711 adult individuals were analyzed by volumetric method. Species' feeding spectrum and spatial, temporal and sexual variations on diet were evaluated. Data matrix was summarized by detrented correspondence analysis (DCA) and the axes scores from DCA were used as variables in one-way ANOVA of null models to test diet variations. Astyanax paranae fed on detritus/sediment, plant matter, algae and aquatic and terrestrial invertebrates. The time-space prevalence of detritus/sediment and plant matter on diet characterized the feeding habit as detritivorous tending to herbivory. Significant differences on food items proportions occurred between the sampling months and sampling sites and were related to resources availability, characterizing the species trophic opportunism.

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Diet and histological features of digestive tube from four discarded fish species by trawl bycatch in Northeastern Brazil

Biota Neotropica ◽

10.1590/1676-0611-bn-2020-0951 ◽

2020 ◽

Vol 20 (3) ◽

Author(s):

Aline da Costa Bomfim ◽

Daniel Solon Dias Farias ◽

Hamilton Barroso Mourão-Junior ◽

Iara Cecília da Costa Morais ◽

Silmara Rossi ◽

...

Keyword(s):

Fish Species ◽

Diet Composition ◽

Feeding Activity ◽

Gonadosomatic Index ◽

Paraffin Section ◽

Feeding Habit ◽

Northeastern Brazil ◽

Biometric Data ◽

Gastric Glands ◽

Digestive Tube

Abstract: Fish feeding habit associated to the morphology of their digestive tube can provide useful biological and ecological information. Between January and December 2012, we examined 16 fish species discarded by trawl in the Potiguar basin, northeastern Brazil, and classified them into four groups according to Alimentary Index - IAi. Our aims were to: (1) provide information on diet composition of one species represented by each group (Opisthonema oglinum, Conodon nobilis, Larimus breviceps and Sphoeroides testudineus), (2) examine the morphology of their digestive tube, and (3) associate ingested food items with the morphological features. Stomach contents were collected and classified according to IAi: main, accessory and secondary categories; fragments of esophagus, stomach, and small intestine were examined using paraffin section technique. Biometric data (total length-TL, standard length-SL and total weight-TW), stomach weight-SW, and gonadal weight-GW were recorded and applied in two indices: (1) the stomach Repletion Index - SRI (SRI = SW/TW × 100) and (2) the gonadosomatic index - GSI (GSI = GW/TW × 100) for the analyses of feeding and reproductive activities, respectively. The main food categories were (1) Teleostei for C. nobilis, (2) Crustacea for L. breviceps and O. oglinum, and (3) Mollusca for S. testudineus. The feeding activity was higher during the dry season, while the GSI was higher in the rainy season. The morphological analysis revealed a regular structure of the tissues analyzed. We highlight the presence of tubular gastric glands and strong muscular walls in the stomach (O. oglinum; L. breviceps); well-developed pyloric caecum in the intestine (O. oglinum; C. nobilis; L. breviceps); and presence of pseudo-stomach (S. testudineus). Our study confirms that the digestive tube of the examined species has morphological adequacy for carnivorous feeding habit, providing useful information on tissue structures associated to diet composition.

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