The length‐weight relationship of four fish species captured in the Ibicuí River, southern Brazil

Pachla, Lucas Adriano; Hartmann, Paula Betina; Massaro, Marthoni Vinicius; Santos, Taciéli dos; Antonetti, Débora Alessandra; Reynalte‐Tataje, David Augusto

doi:10.1111/jai.14017

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…This pattern is as reported by Amarasinghe ( 2002) with a value of b: 2,699 in the Shallow Irrigation Reservoir in Sri Lanka. The difference in growth patterns is caused by several factors, including differences in age, gonad maturity, sex, geographical location, and environmental conditions (fishing activity), stomach fullness, disease, and parasite pressure (Nobile et al 2015;Froese and Pauly 2019;Pachla et al 2020;Yonvitner et al 2020). The asymptotic length of Nile Tilapia found in Siombak Lake reaches 36.04 cm.…”

Section: Discussionmentioning

confidence: 99%

Population dynamics and feeding habit of Oreochromis niloticus and O. mossambicus in Siombak Tropical Coastal Lake, North Sumatra, Indonesia

et al. 2021

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Abstract. Muhtadi A, Nur M, Latuconsina H, Hidayat T. 2021. Population dynamics and feeding habit of Oreochromis niloticus and O. mossambicus in Siombak Tropical Coastal Lake, North Sumatra, Indonesia. Biodiversitas 23: 151-159. Nile Tilapia (Oreochromis niloticus) and O. mossambicus (Mozambique Tilapia) are economically important fish species in Indonesia. This study aims to determine these two fish species' population dynamics, including growth, reproduction, recruitment, mortality rates, exploitation rates, and feeding habits. Samples were taken from September 2018 to August 2019 in Siombak Lake, North Sumatra Province. Data were analyzed in this study using software FISAT-II and Microsoft Excel. The results showed that Nile Tilapia had an isomeric growth pattern, and Mozambique Tilapia exhibited a negative allometric growth pattern. The estimate von Bertalanffy's growth parameters on ELEFAN-I were asymptotic length (L?) of Nile tilapia: 36.06 cm and Mozambique tilapia: 26.09 cm. The growth coefficient (K) of Nile tilapia was 0.59, and Mozambique tilapia was 0.54. The mortality rate (Z) of Nile tilapia reached 3.20 per year, and Mozambique tilapia reached 3.04 per year, whereas the natural mortality (M) of Nile Tilapia 1.24 while Mozambique Tilapia was 1.27. Based on the rate of exploitation, both fish have been overexploited. Peak spawning of Nile Tilapia was in August and December, and of Mozambique Tilapia was in March and June. Both species were omnivores, predominantly with herbivorous feeding habits.

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Section: Discussionmentioning

confidence: 99%

Population dynamics and feeding habit of Oreochromis niloticus and O. mossambicus in Siombak Tropical Coastal Lake, North Sumatra, Indonesia

et al. 2021

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“…Conversely, other studies found to be negative allometric as reported in the Infiernillo Reservoir, Mexico [42], in the Rosetta branch of the Nile River, Egypt [43], in the Aguamilpa Reservoir, Mexico [44], and the Nozha Hydrodrome, Egypt [45]. The difference in growth patterns is affected by several factors, including differences in geographical location, season, sex, stage of fish maturity, food availability, stomach fullness, health, stress and sampling methodology [21,46,34,47].…”

Section: Discussionmentioning

confidence: 99%

Assessment of two cichlids stocks with virtual population analysis in Garmat Ali River, Basrah, Iraq

Mohamed¹

2022

World J. Adv. Res. Rev.

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The study is an attempt to evaluate the population characteristics and virtual population analysis (VPA) of two invasive species (Oreochromis niloticus and Oreochromis aureus) using the FiSAT II software based on the data collected from the Garmat Ali River, Iraq. A total of 4391 individuals (2727 of O. niloticus and 1664 of O. aureus) were measured for length-frequency analysis from October 2019 to September 2020. Length-weight relationships were derived, indicating allometric growth for both species. The asymptotic length (L∞) and growth rate constant (K) were estimated to be 30.5 cm and 0.45 for O. niloticus and 29.9 cm and 0.21 for O. aureus. The annual rates of fishing (F) and exploitation (E) for O. niloticus were found to be 2.24 and 0.69, respectively, and for O. aureus 0.48 and 0.43, respectively. The present exploitation rates (E) of both species were below the biological target reference points, E0.1 and Emax, thus expressing a case of under-exploitation of both species. Besides, the result of the virtual population analysis (VPA) revealed that the majority of O. niloticus and O. aureus individuals were harvested at lengths 20 cm and 17 cm, respectively. Also, the lengths at first capture (L50) for both species were considerably higher than their lengths at first maturity (Lm). Therefore, for management purposes, this study suggests that more yields can be obtained by increasing the fishing activities on these invasive species, such as increasing the number of fishing boats and decreasing the mesh size to decline its abundance in the long term.

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“…However, some authors found that the species' growth demonstrated an isometric growth pattern [2,43,12]. The growth pattern of the species can be affected by several influences, including the environmental conditions between different geographical locations, seasons, sex, stage of maturity, stomach fullness, diseases, and sampling methodology [26,[44][45][46]. "Growth parameters and mortality rates of fish are crucial inputs for stock assessments.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Stock Assessment and Virtual Population Analysis of Carassius auratus (Linnaeus, 1758) in the Al-Diwaniya River, Middle of Iraq

Mohamed

2024

AJFAR

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A total of 1128 individuals of C. auratus were collected from the Diwaniyah River, Iraq. Samples were collected between November 2016 and October 2017 using different fishing gears aiming to assess the stock assessment and virtual population analysis. Fish length ranged from 8.0 to 33.0 cm, with a length-weight relationship exhibiting positive allometric growth. Asymptotic length (L∞) was estimated at 33.0 cm, the growth coefficient (K) was 0.16, and the growth performance index (Ǿ) was 2.241. The values of total (Z), natural (M) and fishing (F) mortality rates were 0.89, 0.47, and 0.42, respectively. The exploitation rate (E) was 0.48. Length with a 50% probability of capture (LC50) was estimated at 18.7 cm and was higher than the length at first maturity (Lm50). The recruitment consisted of one seasonal pulse from April to July. The exploitation rate (E) was below the biological target reference points (E0.1 and Emax), indicating the stock was under exploitation state. The result of the virtual population analysis revealed that most of the fishing mortality happened in mid-lengths (18-26 cm) with a maximum rate at a length of 25 cm. Natural losses were highest among individuals within the length range of 8.0 to 15 cm and then decreased gradually to the length group of 30. For management purposes, this study suggests that more yields can be obtained by increasing the fishing activities on this invasive species, such as increasing the number of fishing boats and decreasing the mesh size to decline its abundance in the long term.

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The length‐weight relationship of four fish species captured in the Ibicuí River, southern Brazil

Cited by 3 publications

References 8 publications

Population dynamics and feeding habit of Oreochromis niloticus and O. mossambicus in Siombak Tropical Coastal Lake, North Sumatra, Indonesia

Population dynamics and feeding habit of Oreochromis niloticus and O. mossambicus in Siombak Tropical Coastal Lake, North Sumatra, Indonesia

Assessment of two cichlids stocks with virtual population analysis in Garmat Ali River, Basrah, Iraq

Stock Assessment and Virtual Population Analysis of Carassius auratus (Linnaeus, 1758) in the Al-Diwaniya River, Middle of Iraq

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