#condition factor

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The occurrence of microplastics in the gastrointestinal tract of demersal fish species

The study aimed to quantify and qualify the microplastics in the gastrointestinal tract contents of the six (6) dominant demersal fish species, determining the percentage frequency of occurrence and the condition factor. Out of 180 fish individuals examined, 21 samples (11.67 % of the total samples) have microplastics in their gastrointestinal tracts. The microplastics observed were fibers which occur the most (count = 22; %FO = 78.57 %), followed by microbeads (count = 5; %FO = 17.86 %) and rubber (count = 1; %FO = 3.57 %). The Spangled Emperor, L. nebulosus, was the highest consumption of 13 (46.43 %) fiber and 1 (3.57 %) microbeads in the stomach. No microplastic in the stomach of the Brown-stripe Snapper, L. vitta. The fish samples without microplastics ingestion differ significantly from fish with microplastics in the stomach. The fish samples without microplastics ingestion displayed a good and well-proportioned fish, while fish with microplastics is as a poor fish, long and thin.

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The study aimed to quantify and qualify the microplastics in the gastrointestinal tract contents of the six (6) dominant demersal fish species, determining the percentage frequency of occurrence and the condition factor. Out of 180 fish individuals examined, 21 samples (11.67 % of the total samples) have microplastics in their gastrointestinal tracts. The microplastics observed were fibers which occur the most (count = 22; %FO = 78.57 %), followed by microbeads (count = 5; %FO = 17.86 %) and rubber (count = 1; %FO = 3.57 %). The Spangled Emperor, L. nebulosus, was the highest consumption of 13 (46.43 %) fiber and 1 (3.57 %) microbeads in the stomach. No microplastic in the stomach of the Brown-stripe Snapper, L. vitta. The fish samples without microplastics ingestion differ significantly from fish with microplastics in the stomach. The fish samples without microplastics ingestion displayed a good and well-proportioned fish, while fish with microplastics is as a poor fish, long and thin.

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The length-weight relationship and condition factor are important growth indicators in fish. They provide information on the status of existing fish stocks and their evolution in an aquatic ecosystem. Studies on the length-weight relationship and condition factor of Oreochromis niloticus, Brycinus nurse and Tilapia mariae were carried out from September 2021 to August 2022 on the Lôkpôhô dam lake in the department of Ferkessédougou (North of Côte d’Ivoire). Fish from artisanal and commercial fishing were collected monthly in collaboration with fishermen. A total of 1610 specimens were observed including 847 specimens of Oreochromis niloticus, 433 specimens of Brycinus nurse and 330 specimens of Tilapia mariae. The results of the length-weight relationship give an allometry coefficient of 2.7 for Oreochromis niloticus, 2.86 forn Brycinus nurse and 2.65 for Tilapia mariae. The condition factors determined for Oreochromis niloticus, Brycinus nurse and Tilapia mariae are 2.15 ± 0.29; 1.46 ± 0.18 and 2.01 ± 0.29, respectively. The length-weight relationship showed a negative allometric (b < 3) for all three species. Condition factors greater than 1 show that these three species adapt well to this habitat.

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The aim of this study is to investigate the effect of anthropogenic pressures on the species Hemichromis bimaticulatus (Gill, 1862) caught in the Sologo dam lake. Sampling for this study to determine the status of Hemichromis bimaticulatus took place from May to July 2022, and the fish collected came from commercial fisheries. A total of 172 individuals grouped into mature (male and female) and immature specimens with standard lengths ranging from 3.5 cm to 10 cm and masses that varied from 2.1 g to 26.41 g were recorded. Length-mass relationships were determined by the equation P = aSLb and the condition factor by the relationship K = 100*W/SL. The coefficient of determination (r²) recorded for all individuals was 0.937, ranging from 0.894 to 0.954. The coefficient of allometry b and the average condition factor for this species ranged from 1.99 to 2.18 and from 3.02 ± 0.54 to 3.44 ± 0.8 respectively. The size frequency distribution showed that 64 % of species have a size between 7.75 cm and 9.05 cm. This study contributes to our knowledge of the biology of Hemichromis bimaticulatus and provides a database of particular growth and condition factors of the species Hemichromis bimaticulatus from the Sologo dam lake.

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The length-weight relationship and wellness of Clarias gariepinus juveniles fed once daily on three different feeds studied for 12 weeks between March and May 2019. 50 C. gariepinus juveniles were randomly separated into three different concrete tanks and fed with Coppens, Zeigler and Aller-aqua feed respectively at a rate of 10kg/body weight once daily. The study revealed that the fish in the three tanks showed negative allometric growth throughout the study (b0.05). At the same time, condition factor decreased as the fish increased in length with Coppens varied from 7.40 to 1.18, Aller aqua from 9.69 to 1.46 and Zeigler from 9.09 to 1.31. Condition factor differences did not test statistically different (p>0.05). An indication that the different feeds are appropriate for efficient C. gariepinus production fed once with appropriate body weight feeding adjustment. The values of the condition factor reflect healthy fish status with the different feeds.

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PPT - Allometric growth pattern and reproductive biology of Channa striata PowerPoint Presentation - ID:12739040

A research based fishery management would lead to more sustainable fishery resources. This study aimed to provide biological and reproductive data of Channa striata from Lake Mainit Philippines. Length-weight relationship, condition factor, gonadosomatic and hepatosomatic indices were determined in this study. Results revealed that snakeheads showed a significant difference in terms of body weight and gonad weight. Females weighed heavier than males. Female gonads were heavier than males as it had high percentage of mature stage (53.13%) in terms of gonadal development compared to male which were in maturing stage (47.83%). Female snakeheads preponderated the males in terms of sex ratio (1:0.72). The length – weight relationship revealed an allometric growth pattern. Female snakehead demonstrated positive allometric pattern (b=3.3143) while male snakehead showed negative allometric growth pattern (b=1.7267). The values for the condition factor in both sexes of snakehead were less than 3, indicative of a poor condition which may be attributed to the threatened environmental condition of the lake. The GSI values in both sexes are high and greater than 1, implying of their fecundity as revealed and consistent to the observed stages of gonadal development. The HSI values for female and male snakehead were minimal, suggestive of low hepatic activity. An inverse relationship between GSI and HIS has been shown in this study. The values on the body parameters and reproductive biology of C. striata from Lake Mainit, Philippines are vital baseline information for rational fishery management in the lake. A study on temporal and spatial distribution of C. striata caught from this lake and its tributaries may be conducted to elaborate further its reproductive biology particularly on its spawning season to provide significant knowledge in the promotion of C. striata utilization and capture production as well as in the restoration of Lake Mainit fishery resources to sustainability.

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Microplastics in Bigeye Scad: Malimono Waters Study | InformativeBD

This study evaluated the presence of microplastic ingestion by bigeye scad, Selar crumenophthalmus from the Municipal Waters of Malimono, Surigao del Norte, Philippines. The microplastics were found in seven (7) fish individuals (11.67%) from a total of 60 fish samples examined, with an average of 0.12 ± 0.04 (mean ± SD) items per fish. Fibers (42.86%) made up the majority of the ingested plastic, followed by beads and fragments (28.57%). Only one piece of plastic was found in each of the stomachs of the seven fish samples that had consumed microplastic. The amount of microplastic that fish consumed in this study is relatively low compared to other findings from various locations. The statistical analysis proved that there is no significant difference (p>0.05) in the condition of all samples with or without microplastic ingestion in the stomach. The mean relative condition factor (Kn) both with and without microplastic ingestions is (K>1), which indicates that fish have good condition.

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PPT - Ingestion of microplastics by bigeye scad, Selar crumenophthalmus in Municipal PowerPoint Presentation - ID:12674192

This study evaluated the presence of microplastic ingestion by bigeye scad, Selar crumenophthalmus from the Municipal Waters of Malimono, Surigao del Norte, Philippines. The microplastics were found in seven (7) fish individuals (11.67%) from a total of 60 fish samples examined, with an average of 0.12 ± 0.04 (mean ± SD) items per fish. Fibers (42.86%) made up the majority of the ingested plastic, followed by beads and fragments (28.57%). Only one piece of plastic was found in each of the stomachs of the seven fish samples that had consumed microplastic. The amount of microplastic that fish consumed in this study is relatively low compared to other findings from various locations. The statistical analysis proved that there is no significant difference (p>0.05) in the condition of all samples with or without microplastic ingestion in the stomach. The mean relative condition factor (Kn) both with and without microplastic ingestions is (K>1), which indicates that fish have good condition.