scholarly journals Feeding habit of Eigenmannia trilineata Lopez & Castello, 1966 (Teleostei: Sternopygidae) of Parque Estadual de Itapuã, RS, Brazil

2005 ◽  
Vol 3 (2) ◽  
pp. 291-298 ◽  
Author(s):  
Júlia Giora ◽  
Clarice B. Fialho ◽  
Ana Paula S. Dufech
Keyword(s):  
Electric Fish ◽  
Condition Factor ◽  
Feeding Habits ◽  
Abiotic Factors ◽  
Feeding Activity ◽  
Reproductive Period ◽  
Weakly Electric Fish ◽  
Frequency Variation ◽  
Dietary Analysis ◽  
Food Items

This study aims to describe the feeding habits of a population of the weakly electric fish Eigenmannia trilineata from Southern Brazil through the monthly frequency variation of replection (RI) and hepatosomatic (HSI) indexes, condition factor (CF) and dietary analysis of the species, besides the comparison of the results with abiotic factors. We collected 428 specimens from June/2002 to May/2003 with a dip net and electric fish detector. Stomach contents were analyzed using three measurements: frequency of occurrence of food items, percentage composition per prey type and feeding importance index. Microcrustacea and autochthonous insects were the dominant food items in the stomachs of E. trilineata. The adults (males larger than 63.5 mm and females larger than 80.5 mm) exhibited little alteration in their diet during the reproductive period and ingested more variety of food items. The RI of males, but not females, showed peaks before and after the reproductive period, having significant correlation with the HSI. Condition factor was more influenced by stomach weight in males and by the gonad weight in females. No correlation between abiotic factors and feeding activity was identified.

scholarly journals Reproductive biology of weakly electric fish Eigenmannia trilineata López and Castello, 1966 (Teleostei, Sternopygidae)

2009 ◽  
Vol 52 (3) ◽  
pp. 617-628 ◽  
Author(s):  
Júlia Giora ◽  
Clarice Bernhardt Fialho
Keyword(s):  
Sexual Dimorphism ◽  
Reproductive Biology ◽  
Electric Fish ◽  
Abiotic Factors ◽  
Reproductive Period ◽  
Weakly Electric Fish ◽  
Southern Brazil ◽  
Water Conductivity ◽  
Total Length ◽  
Weakly Electric

This study described the reproductive biology of a population of the weakly electric fish Eigenmannia trilineata from southern Brazil, providing the information on the estimation of reproductive period, fecundity, spawning type, first maturation size, and analysis of gonadal morphology and histology of the species, relating these data to alimentary and abiotic characters. The species showed a relatively long reproductive period, a relative fecundity of 0.27 oocytes per mg of total weight and a parcelled spawning type. First maturation size estimated for the females was 80.5 mm and for the males 63.5 mm of total length. Sex ratio did not differ from 1:1 under a X²test (α= 0.01) during all the sampled months. Sexual dimorphism was related to total length, and males had larger total length than females. The abiotic factors photoperiod and water conductivity presented significant correlations with female GSI, while male GSI presented a significant correlation only with photoperiod.

scholarly journals Feeding Ecology Of Chironomus Larvae (Insecta: Diptera) Collected From Different Habitat of Dhaka, Bangladesh

2012 ◽  
Vol 40 (1) ◽  
pp. 129-133 ◽  
Author(s):  
M Niamul Naser ◽  
Dulon Roy
Keyword(s):  
Feeding Habits ◽  
Feeding Activity ◽  
Food Selection ◽  
Single Species ◽  
Gut Content Analysis ◽  
Gut Content ◽  
Feeding Intensity ◽  
Chironomid Larvae ◽  
Food Items ◽  
Low Degree

Chironomid larvae are frequently available in the muddy habitats of Curzon Hall campus of University of Dhaka. The larvae of single species of  Chironomus (Insecta: Diptera) were collected from the drains and pond of the campus. Algae, fungi, diatoms, protozoan’s, rotifers, animal parts (crustacean appendages, ostracodan shell, insect appendages), and detritus were found as the  main food items of the larvae. Gut content analysis showed a change in their  feeding habits with seasons. The feeding intensity was maximum in spring just after winter. The feeding activity was lowest in winter. The variation in the diet  may suggest that these groups showed a low degree of selectivity, having more  generalist food selection habit. DOI: http://dx.doi.org/10.3329/bjz.v40i1.12902 Bangladesh J. Zool. 40(1): 129-133, 2012

scholarly journals Biological aspects of Schizodon nasutus Kner, 1858 (Characiformes, Anostomidae) in the low Sorocaba river basin, São Paulo state, Brazil

2011 ◽  
Vol 71 (3) ◽  
pp. 763-770 ◽  
Author(s):  
GA. Villares Junior ◽  
LM. Gomiero ◽  
R. Goitein
Keyword(s):  
River Basin ◽  
Condition Factor ◽  
Feeding Activity ◽  
Gonadosomatic Index ◽  
Sao Paulo ◽  
Reproductive Period ◽  
Fish Diet ◽  
São Paulo ◽  
Summer Period ◽  
Biological Aspects

Four biological aspects of Schizodon nasutus in the low Sorocaba river basin, São Paulo, Brazil were analysed. These were accomplished during the year seasons. The fish diet and the feeding activity were investigated by studying the repletion index, which showed no significant differences between seasons. The food items analysed by frequency of occurrence and dominance showed a predominance of vegetable items in the diet. The reproduction, analysed by using the gonadosomatic index, indicated that the reproductive period occurs during the summer period when temperatures are higher and rainfalls are more intense. The amount of accumulated fat and condition factor varied according to reproduction, especially for females.

scholarly journals Feeding Habits of the Non-Native Mayan Cichlid, Mayaheros urophthalmus, in Estuarine Tributaries of Southwest Florida

2021 ◽  
Vol 32 ◽  
pp. 57-66
Author(s):  
Copley Smoak ◽  
Jeffrey Schmid
Keyword(s):  
Benthic Invertebrates ◽  
Feeding Habits ◽  
Habitat Characteristics ◽  
Wet Season ◽  
Dietary Analysis ◽  
Southwest Florida ◽  
Food Items ◽  
Importance Index ◽  
Opportunistic Predator ◽  
Mayan Cichlid

Foraging habits of the non—native Mayan Cichlid (Mayaheros urophthalmus) were investigated in the tidal tributaries to the Estero Bay and Wiggins Pass estuaries in southwest Florida (USA) during 2011—2013. Dietary analysis was conducted by identifying contents in the digestive tracts of 747 fish and volumetrically measuring the food items. Detritus was the predominant food item by frequency (97–100%), volume (34–48%), and alimentary importance index (47–64%). Bivalves, gastropods, decapod and cirriped crustaceans, coleopterans, serpulid polychaetes, and fish scales frequently (>50%) occurred in samples but volume and importance differed among tributaries. Results indicate that the Mayan Cichlid in southwest Florida tidal tributaries is an opportunistic predator of hard—shelled invertebrates. Although there was considerable overlap in dietary composition, percent volume of food items was significantly different among tributaries during dry seasons. In each tributary, detritus was consumed in greater percentage during the dry season and benthic invertebrates were consumed in greater percentages during the wet season. Consumption of detritus, algae, and plant material may be incidental to predation on benthic invertebrates but more information is needed on digestion and assimilation of food items. Variability in diet among the tributaries in the current study and among other studies was presumably a function of habitat characteristics and the corresponding availability of prey types.

scholarly journals Length-weight Relationship, Condition Factor and Feeding Habits of Synodontis clarias (Linnaeus, 1758) in the Lower River Benue at Makurdi, Nigeria

2015 ◽  
Vol 6 ◽  
pp. 59-67
Author(s):  
P M Akombo ◽  
E T Akange ◽  
B O Amali ◽  
J N Shima
Keyword(s):  
Growth Pattern ◽  
Condition Factor ◽  
Size Range ◽  
Regression Coefficient ◽  
Feeding Habits ◽  
Allometric Growth ◽  
Food Items ◽  
Weight Relationship ◽  
Wide Range ◽  
The Mean

The Length-Weight Relationship (LWR), Condition factor (K) and feeding habits of Synodontis clarias (Linnaeus, 1758) were investigated over a 24 month period from January, 2009 - December, 2010. A total number of 163 specimens comprising of 74 females and 89 males with the size range of 7.60 – 20.00cm and the mean of 12.72± 0.258cm were investigated. The weight ranged from 13.12 – 607.30g with the mean of 65.83± 0.897g. The LWRs for the females, males and combined sexes had the r values of 0. 8415, 0.9463 and 0.8703 respectively. The mean condition factor K was 3.3667, 2.6868 and 2.9954 for the females, males and combined sexes respectively. The regression coefficient b was 1.9408, 1.8799 and 2.1359 for the females, males and combined sexes respectively indicating negative allometric growth pattern for the species. Out of the 163 stomachs examined for food items, 88 (53.99%) were empty while 75 (46.01%) contained a wide range and varying quantities of food items indicating that S.clarias in River Benue is omnivorous.

scholarly journals Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil

2009 ◽  
Vol 7 (4) ◽  
pp. 737-744 ◽  
Author(s):  
Andrea B. Schaan ◽  
Júlia Giora ◽  
Clarice B. Fialho
Keyword(s):  
Sexual Dimorphism ◽  
Sex Ratio ◽  
Reproductive Biology ◽  
Water Depth ◽  
Electric Fish ◽  
Gonadosomatic Index ◽  
Reproductive Period ◽  
Weakly Electric Fish ◽  
Hepatosomatic Index ◽  
Southern Brazil

The reproductive biology of a population of the weakly electric fish Brachyhypopomus draco from southern Brazil is described. Information is provided on the establishment of the reproductive period in this species and its relations with environmental and feeding factors, as well as on the absolute and relative fecundities, spawning type, sex ratio and sexual dimorphism. The species exhibits a relatively long reproductive period, a relative fecundity of 0.173 oocytes per mg of female total weight, and fractional spawning. The sex ratio did not differ from 1:1 during all sampled months. Sexual dimorphism related to hypertrophy of the male's distal portion of caudal filament was observed and males grew to greater lengths than females. Male gonadosomatic index (GSI) was significantly related to water depth, oxygen saturation and temperature. Female GSI was significantly related to water depth and hepatosomatic index.

scholarly journals Length-Weight Relationship, Condition Factor and Feeding Habit of Fishes from Mangrove of Santubong Estuary, Sarawak, Malaysia

2021 ◽  
Vol 11 (2) ◽  
pp. 10-18
Author(s):  
Farah Akmal Idrus ◽  
Fazimah Aziz ◽  
Adriana Christopher Lee
Keyword(s):  
Condition Factor ◽  
Feeding Habits ◽  
Monsoon Season ◽  
B Value ◽  
Feeding Habit ◽  
Food Items ◽  
Weight Relationship ◽  
Significant Difference ◽  
Fish Samples ◽  
Study Species

Length-weight relationship (LWR), condition factor (K) and feeding habits of Coilia dussumieri, Nemapteryx nenga and Nibea soldado from Santubong Estuary, Sarawak, Malaysia were reported in the present study. The sampling was conducted during the non-monsoon season and monsoon season from April to November 2017 at Buntal, Penambir and Demak rivers using three-layered gillnets. A total of 182 fish samples were caught and measured for the total length and body weight. Then, the data were analysed by the equations for LWR and K. The feeding behaviour analysis was carried out using Relative Gut Index (RGI) and Frequency of Food Occurrence method. The log-transformed regression showed that most of the fishes exhibited negative allometric. K showed a significant difference between seasons. The RGI values of the fishes showed that they were carnivorous. The highest frequency of food occurrence in both seasons was gastropods (94-95 %) and the food items were found to be more variable during monsoon season (gastropods insect, worms, fish, asteroidea, phytoplankton and bivalve). The b value is an exponent to measure the growth pattern of fish and in this study, the b values were in the expected range of 2.5-3.5 and not affected by seasonal variation. The K values suggesting that most of the species were surviving well in the river and was influenced by seasonal change. The RGI and frequency of food occurrence showed that all fish in this study species were carnivorous with more variability in food was observed during the monsoon season. The data of this study are important for a sustainable fisheries management in this area.

scholarly journals Seasonal analysis of food items and feeding habits of endangered riverine catfish Rita rita (Hamilton, 1822)

2022 ◽  
Vol 82 ◽  
Author(s):  
M. A. Haque ◽  
S. Paul ◽  
M. A. S. Jewel ◽  
U. Atique ◽  
A. K. Paul ◽  
...  
Keyword(s):  
Feeding Habits ◽  
Close Association ◽  
Feeding Activity ◽  
Stomach Contents ◽  
Food Items ◽  
Significant Difference ◽  
Mouth Size ◽  
Size Groups ◽  
Food And Feeding ◽  
Seasonal Analysis

Abstract This investigation presents the food and feeding activity of and endangered riverine catfish Rita rita, during February 2017-January 2018. A total of 225 fish individuals was analyzed for stomach contents by characterizing the dominant food items and morphometric features. The results divulged ten major food items consumed, preferably fish scales and eggs, teleost fishes, copepods, cladocerans, rotifers, and mollusks. Total length and body weight of fish varied between 9-34 cm (20.53 ± 6.90 cm) and 10-400 g (9125.94 ± 102.07 g), respectively. The index of relative importance (IRI%) showed the importance of rotifers over the other food items. Morisita’s index of diet overlap indicated seasonal variations in catfish diets with summer and monsoon displaying the least overlap, while maximum overlap during monsoon and winter seasons. The non-metric multidimensional scaling (nMDS) indicated the close association between the food items available during summer and winter seasons with a significant difference among the seasons (ANOSIM, R = 0.638, P = 0.013). Levin’s niche breadth index arranged in the order of 0.88>0.81>0.78>0.63>0.43 for the size classes of V, IV, III, II and I, respectively. The PCA explained 95.39% of the total variance among the food items and fish size groups. Small-sized fish individuals displayed a greater correlation with food items suitable for their mouth size. In conclusion, the variety and frequency of food items recorded indicated considerable feeding plasticity and opportunistic feeding behavior with a shift from carnivorous to omnivorous feeding nature. This study could render useful information on the food and feeding habits of R. rita and provide background for preparing its diet for future aquaculture practices.

scholarly journals Feeding dynamics of Cichla kelberi Kullander & Ferreira, 2006 introduced into an artificial lake in southeastern Brazil

2010 ◽  
Vol 8 (4) ◽  
pp. 819-824 ◽  
Author(s):  
Gilberto Aparecido Villares Junior ◽  
Leandro Muller Gomiero
Keyword(s):  
Food Item ◽  
Feeding Activity ◽  
Reproductive Period ◽  
High Rate ◽  
Southeastern Brazil ◽  
High Concentration ◽  
Artificial Lake ◽  
Food Items ◽  
Gonadal Maturity ◽  
Early Fall

The objective of this study was to characterize the seasonally of the diet of Cichla kelberi in an artificial lake in Leme-SP, determining the food items and their relation to the sex and gonadal maturity of the fish sampled. The diet of C. kelberi presents a dynamic in three different periods: winter months were characterized by low feeding activity and a high concentration of undetermined fish; increase in feeding activity occurred in the spring, with Tilapia sp. being the dominant food item; and a high rate of cannibalism was observed in the summer and early fall. The plasticity in the composition of the diet was marked by quantity of prey available during the different periods of the year, and the reproductive period.

Food and Feeding Habits of Luidia Ciliaris Echinodermata: Asteroidea

1972 ◽  
Vol 52 (1) ◽  
pp. 225-236 ◽  
Author(s):  
Einar Brun
Keyword(s):  
Feeding Habits ◽  
Feeding Activity ◽  
Irish Sea ◽  
Important Food ◽  
Spawning Period ◽  
Food Items ◽  
Psammechinus Miliaris ◽  
Food And Feeding ◽  
The Irish Sea

Luidia ciliaris (Philippi) has intraoral digestion and was found to be a selective feeder on echinoderms. In 258 specimens from the Irish Sea, echinoderms occurred in 97·4% of all stomachs containing food and contributed 92% of the food volume (estimated by points method). The most important food items were Psammechinus miliaris, Ophiothrix fragilis, Ophiura albida and Ophiocomina nigra. Ophiocomina nigra did not occur as frequently as would be expected from their availability. Observation in situ revealed that large specimens had efficient escape response to moving Luidia and aquarium experiments showed that O. nigra deprived of their moving ability were readily eaten. However, the Luidia showed clear preference to Ophiothrix fragilis. There was no distinct seasonal difference in the composition of the diet, but a tendency to a minimum feeding activity in May-June, probably connected with the spawning period.

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