scholarly journals Some Aspects of the Anatomy and Histology of Digestive Tracts in Two Sympatric Species of Freshwater Fishes

2003 ◽  
Vol 8 (2) ◽  
pp. 97 ◽  
Author(s):  
Taher Ba-Omar ◽  
Reginald Victor ◽  
Daniel Tobias
Keyword(s):  
Light Microscopy ◽  
Alimentary Canal ◽  
Comparative Anatomy ◽  
Feeding Habits ◽  
Sympatric Species ◽  
Species Relationships ◽  
Morphometric Measurements ◽  
Morphometric Characters ◽  
Total Length ◽  
Garra Barreimiae

Comparative anatomy and histology of the digestive tracts of two sympatric species of freshwater fish, Aphanius dispar (Cyprinodontidae) and Garra barreimiae (Cyprinidae) are studied. Morphometric measurements of alimentary canal such as length and the number and height of rugae in sections have been made for both species. Relationships between these morphometric characters and the total length of fish have been evaluated. The ratio between the length of alimentary canal and total length of fish in both species reflects their feeding habits. Histology of the ‘stomach’ and ‘intestine’ of these two species as shown by light microscopy has been described and compared. Results of this study are used to discuss the query whether these species have true stomachs. 

scholarly journals Food and Feeding Habit of Aspidoparia Morar: A Study on Padma River in Northwestern Bangladesh

2019 ◽  
Author(s):  
Istiaque Hossain ◽  
Suraia Sarmin ◽  
Md. Mahmudul Alam ◽  
Lubna Alam ◽  
Mazlin Bin Mokhtar ◽  
...  
Keyword(s):  
Alimentary Canal ◽  
Feeding Habits ◽  
Seasonal Pattern ◽  
Feeding Preference ◽  
Point Method ◽  
Gut Contents ◽  
Index Method ◽  
Average Percentage ◽  
Total Length ◽  
Food And Feeding

Understanding the interspecific relationships for proper management of an ideal fishery system, food, and feeding habits of fishes are prerequisites. The food and feeding habits including types and amount of feed and seasonal pattern of feeding were studied. 168 Aspidoparia morar were collected from the River Padma, Rajshahi, Bangladesh from May to December, 2011. The relationship between total length and alimentary canal length was tested using OLS regression. Qualitative as well as quantitative analyses of stomach and gut contents of each fish were done by percentage of occurrence and point method and fullness of stomach was measured by fullness index method. Aspidoparia morar was omnivorous due to the presence of both phytoplankton (Chlorophyceae, Euglenophyceae, Bacillariophyceae, Cyanophyceae) and zooplankton (Rotifera, Crustacea) in the gut content. Based on the point method, the average percentage of phytoplankton and zooplankton was 80.71% and 19.29%, respectively. The highest average percentage of fullness was 72.62% in October whereas the lowest was 56.55% in December. The highest average percentage of emptiness recorded was 43.45% in December and the lowest was 27.38% in October. Total length was found statistically positively significant (P0.01) with the alimentary canal length. Overall, the article concludes that Aspidoparia morar is an omnivore with a higher feeding preference for phytoplankton and the food habits change with the seasons based on the qualitative and quantitative analysis of food.

scholarly journals MURAT NEHRI (PALU-ELAZIĞ)’NDE YAŞAYAN CAPOETA TRUTTA (HECKEL, 1843) TÜRÜNÜN BAZI MERISTIK VE MORFOMETRIK ÖZELLIKLERI

2020 ◽  
Vol 15 (4) ◽  
pp. 155-162
Author(s):  
Ebru İfakat Özcan
Keyword(s):  
Body Height ◽  
Pectoral Fin ◽  
Meristic Characters ◽  
Morphometric Measurements ◽  
High Positive Correlation ◽  
Morphometric Characters ◽  
Total Length ◽  
Fish Samples ◽  
Fin Rays ◽  
Pelvic Fin

In the present study, some meristic and morphometric characteristics of 66 Capoeta trutta (Heckel, 1843) fish samples collected from Murat River (Palu-Elazığ) were examined. The samples were immediately preserved with ice and fixed with 5% formaldehid on arrival in the laboratory. Metric measurements were carried out with 0.01 mm sensitive calipers. Meristic characters were counted as number of the dorsal fin rays, number of the anal fin rays, number of the pelvic fin rays, number of the pectoral fin rays, number of scales on the lateral line and number of the pharyngeal teeth. The morphometric characters were measured as total length, fork length, standard length, predorsal length, postdorsal length, caudal peduncle length, body width, body height, snout length, head length, head width, eye diameter, mouth width, intertorbital length, distance between pelvic fin and anal fin, distance between pelvic fin and pectoral fin. Morphometric measurements as total length percentage and total length regression models and determination coefficients (r2) were calculated. Generally, a significant, high, positive correlation was found between total length and morphometric measurements (r2= 0.70-0.92, p<0.01).

scholarly journals Morphometric characters and their relationship in estuarine catfish

1970 ◽  
Vol 6 (2) ◽  
pp. 349-353 ◽  
Author(s):  
M Begum ◽  
Abdullah Al-Mamun ◽  
ML Islam ◽  
MJ Alam
Keyword(s):  
Sexual Dimorphism ◽  
Linear Relationship ◽  
Standard Length ◽  
Head Length ◽  
Pectoral Fin ◽  
Morphometric Characters ◽  
Total Length ◽  
Length Standard ◽  
Eye Diameter ◽  
Males And Females

The morphometric observations were made on total length, standard length, pre-caudal length, head length, eye diameter and depth of body at pectoral fin base of estuarine catfish M. gulio. Males and females showed homogeneity in characters. A linear relationship was found between total length and morphometric characters. Regression of length and weight did not deviate significantly from cube law indicating isometric growth. The fish exhibited sexual dimorphism. Keywords: Morphometric characters; Estuarine catfish; Mystus gulio DOI: 10.3329/jbau.v6i2.4833 J. Bangladesh Agril. Univ. 6(2): 349-353, 2008

scholarly journals Morphometry of Rhinomugil Corsula (Hamilton, 1822) From Sitakunda Coast of the Bay of Bengal, Bangladesh

2021 ◽  
Vol 49 (2) ◽  
pp. 229-241
Author(s):  
Syeda Ismat Ara ◽  
Mohammad Ali Azadi ◽  
Munira Nasiruddin ◽  
Aftab Hossain
Keyword(s):  
Bay Of Bengal ◽  
The Body ◽  
Head Length ◽  
Regression Equations ◽  
Morphometric Characters ◽  
Total Length ◽  
Linear Relationships ◽  
Investigation Period ◽  
R Value ◽  
Rhinomugil Corsula

A total of 65 specimens of Rhinomugil corsula (Hamilton, 1822), measuring from 8.1 cm to 28.9 cm in total length, collected from the Sitakunda coast of the Bay of Bengal, were used for the morphometric analysis during the period between March 2016 and February 2018. Twenty seven morphometric characters were selected and studied during the investigation period. The regression equations – both arithmetic and logarithmic – between the total length (TL) and 21 morphometric characters, and head length (HL) with five morphometric characters related to the head, were determined. The value of coefficient of correlation ‘r’ for each relationship was calculated and t-test for each ‘r’ value was also done. The relationships of the various measurements of the body with the total length – and head length with the five relevant characters -of R. corsula from the Sitakunda coast of the Bay of Bengal showed linear relationships, which were highly significant (P<0.01). The ranges of ‘b’ values 0.967 to 1.346 in case of the relationships between TL and 21 relevant characters, whereas 0.906 to 1.236 in case of the relationships between HL and 5 relevant characters. These values differ insignificantly (P>0.01) with typical value b=1 indicating isometric relationships among the characters. Bangladesh J. Zool. 49 (2): 229-241, 2021

scholarly journals Feeding habits of Cocobolo Andinoacara pulcher in the cienaga Grande de Lorica, Colombia

2016 ◽  
pp. 5189-5197
Author(s):  
Charles W Olaya-Nieto ◽  
Liquey Camargo-Herrera ◽  
Vanessa Díaz-Sajonero ◽  
Fredys F Segura-Guevara
Keyword(s):  
River Basin ◽  
Stomach Content ◽  
Feeding Habits ◽  
Frequency Of Occurrence ◽  
Relative Importance ◽  
Food Groups ◽  
Total Length ◽  
Length Relationship ◽  
Importance Index ◽  
Gut Length

ABSTRACTObjective. The feeding habits of Cocobolo (Andinoacara pulcher) in the cienaga Grande de Lorica, Sinu river basin, were studied. Materials and methods. The stomach content was analyzed using the Proportion of empty stomachs, Grade of digestion, Frequency of occurrence, numerical Frequency, Gravimetry, relative importance Index (RII) and the gut length-total length relationship. Results. 39.8% of stomachs were empty, 47.1% of preys were fresh and five food groups were identified. Vegetable remains was the most frequent group (63.8%) and the prey with greatest composition in weight (33.5%), while Rest of fishes was the most abundant group (34.7%). It was observed that in low and rising waters, fishes was the most consumed prey, while that in high and falling waters the most consumed prey was vegetable remains. Vegetable remains, detritus and fishes were food groups of secondary relative importance, while Insects and Others were circumstantial or incidental groups. Conclusions. The results achieved indicate that Cocobolo is a fish with omnivores feeding habits with a preference for fishes and vegetable remains. RESUMEN Objetivo. Se estudiaron los hábitos alimentarios de Cocobolo (Andinoacara pulcher) en la ciénaga Grande de Lorica, cuenca del río Sinú, Colombia. Materiales y Métodos. El contenido estomacal se evaluó con el Coeficiente de vacuidad, Grado de llenado, Grado de digestión, Frecuencia de ocurrencia, Frecuencia numérica, Gravimetría, Índice de importancia relativa y la relación longitud intestinal- longitud total. Resultados. El 39.8% de los estómagos se encontró vacío, el 47.1% de las presas en estado fresco y se identificaron cinco grupos alimentarios. Material vegetal fue el grupo más frecuente (63.8%) y con mayor composición por peso (33.5%), mientras que Restos de peces fue el más abundante (34.7%). Se observó que en aguas bajas y en aguas ascendentes, peces fue la presa más consumida, mientras que en aguas altas y aguas descendentes, fue material vegetal. Material vegetal, detritos y restos de peces fueron grupos alimentarios de importancia relativa secundaria, mientras que insectos y otros fueron circunstanciales o incidentales. Conclusiones. Los resultados alcanzados indican que Cocobolo es un pez de hábitos alimentarios omnívoros con preferencia por peces y material vegetal.

Reproductive synchrony of three sympatric species of wobbegong shark (genus Orectolobus) in New South Wales, Australia: reproductive parameter estimates necessary for population modelling

2007 ◽  
Vol 58 (8) ◽  
pp. 765 ◽  
Author(s):  
Charlie Huveneers ◽  
Terence I. Walker ◽  
Nicholas M. Otway ◽  
Robert G. Harcourt
Keyword(s):  
New South ◽  
New South Wales ◽  
Species Conservation ◽  
Sympatric Species ◽  
Parameter Estimates ◽  
Reproductive Parameters ◽  
Population Modelling ◽  
Male Population ◽  
Total Length ◽  
South Wales

Reproductive parameters of three closely-related sympatric species of wobbegong (Orectolobus ornatus, O. maculatus and O. halei) off New South Wales (NSW) were investigated to contribute to a biological basis for the management of a commercial fishery targeting wobbegongs. Estimates of the onset of maturity based on ovary condition were 729 mm, 1117 mm, and 1591 mm total length (TL) for O. ornatus, O. maculatus and O. halei respectively. The length at which 50% of the male population is mature based on clasper calcification was 803 mm, 1282 mm and 1784 mm TL for O. ornatus, O. maculatus and O. halei, respectively, and was similar to female onset of maturity based on uterus condition and to TL-at-maternity. These species of wobbegong had synchronous, triennial reproductive cycles. Follicles took 2 years to enlarge before ovulation. During the first year, follicles remained small, and then grew rapidly during the second year before ovulation during November. Gestation lasted ~10–11 months and parturition occurred during September–October. Mean litter sizes were nine (s.e. 0.5) and 21 (s.e. 1.5) for O. ornatus and O. maculatus, respectively, and increased with female total length in O. ornatus. Pregnant O. ornatus and O. maculatus were frequently caught in northern NSW and no pregnant wobbegongs, or females with large, yolky follicles were captured south of Sydney. Differences in the reproductive conditions of wobbegongs caught in northern and central NSW suggested geographically dependent reproductive behaviour. Knowledge of the reproductive parameters provided in this paper is necessary for adequate fisheries management and species conservation assessments.

Molecular divergence between two sympatric species of Dondice (Mollusca: Nudibranchia) with distinct feeding specializations

2013 ◽  
Vol 93 (7) ◽  
pp. 1887-1893 ◽  
Author(s):  
Luis Gonzalez ◽  
Dieta Hanson ◽  
Ángel Valdés
Keyword(s):  
Feeding Habits ◽  
Phylogenetic Analyses ◽  
Molecular Data ◽  
Sympatric Species ◽  
Developmental Differences ◽  
Nominal Species ◽  
Western Atlantic ◽  
16S Gene ◽  
Putative Species ◽  
Gene Data

Analysis of mitochondrial (16S) and nuclear (H3) gene data using phylogenetic and population genetic approaches has revealed some genetic differences between two putative species of western Atlantic Dondice opisthobranchs that feed differentially on hydroids or on up-side-down jellies of the genus Cassiopeia. These results partially support the validity of the species Dondice parguerensis, which was described for the jelly-eating Dondice. However, phylogenetic analyses revealed that the hydroid-feeding species Dondice occidentalis and D. parguerensis are not reciprocally monophyletic and they are identical for the nuclear H3 gene. Although there are morphological and developmental differences between these two nominal species, the molecular data are inconclusive. A possible explanation is that the two putative species are in the process of speciation due to different feeding habits, resulting in the presence of genetic synapomorphies in D. parguerensis, but only in the more variable 16S gene. Because the ranges D. occidentalis and D. parguerensis overlap and there are no obvious barriers to gene flow between the two putative species, this may constitute a possible example of incipient sympatric speciation in benthic marine organisms.

Food and feeding habits of Triturus vulgaris (L.) and T. cristatus (LAURENTI) (Amphibia) in two bog tarns in central Norway

1983 ◽  
Vol 4 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Dag Dolmen ◽  
Jan Ivar Koksvik
Keyword(s):  
Benthic Invertebrates ◽  
Feeding Habits ◽  
Sympatric Species ◽  
Triturus Vulgaris ◽  
Food And Feeding ◽  
Benthic Prey

AbstractThe diets oftwo sympatric species of newts, Triturus vulgaris(L.) and T. cristatus(LAURENTI), from two localities in central Norway, have been compared. Adult T. vulgaris ate mainly those Cladocera which can be classified as planktonic, and to a lesser degree those which are predominantly benthic. The food of T. cristatus was predominantly benthic invertebrates and Cladocera associated with the bottom. T. vulgaris larvae ate planktonic - and predominantly benthic Cladocera, and to a certain degree also larger benthic invertebrates, while T. cristatus larvae (July-August) had taken almost exclusively Cladocera, 75% of which can be classified as planktonic. Large T. cristatus larvae (in September) had eaten relatively more benthic prey. These data would fit the hypothesis that the modes of feeding of the species are different: Adult T. vulgaris swim about in the water much of the time, while T. cristatus stay on the bottom. Among the young, T. vulgaris larvae are mainly associated with the bottom, while T. cristatus larvae are definitely more nektonic during most of the summer; large T. cristatus larvae, however, when nearing the time for metamorphosis, become benthic.

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