Morphometric Character Analysis

Oct 13, 2025 by wbrum.org 76 views

Morphometric Character and Growth of Belanak Fish (Moolgarda Rule) in the Waters of Selotong Village, Secanggang District, Langkat Regency

Introduction

The Belanak fish (Moolgarda sid) is a species of fish that is widely found in the waters of Selotong Village, Secanggang District, Langkat Regency. This fish is one of the main catches for local fishermen and has a significant economic value. The study aims to analyze the morphometric characters, aspects of growth, and mortality levels of Belanak fish in the area. Understanding the growth pattern and mortality rate of this fish species is crucial for the management of sustainable fisheries resources and the preservation of the aquatic ecosystem.

Research Methodology

The study was conducted in the waters of Selotong Village during the period July to September 2019. A total of 122 Belanak fish were observed and taken using a special net at three taking stations. In addition, water quality measurements were also carried out to support data analysis. The data collected was grouped into two categories, namely morphometric characters and growth aspects.

Morphometric Character Analysis

Measurement of morphometric characters involves 22 fish body parameters. One important analysis is the determination of long frequency distribution, where the total length of fish is used to determine the growth pattern. The long distribution is categorized in a certain length interval and mapped in a graph to facilitate understanding of its growth patterns.

The long relationship of Belanak fish is analyzed using a statistical test, which helps in determining the condition of fish conditions. Factors such as health indicators and fish proportionality, which is calculated based on the length and weight of the fish taken, are also analyzed.

Growth Aspect

In this study, the growth pattern of Belanak fish in the village of Selongk was found to be allometric negative. This means that the growth of the length of the liver fish is faster than the weight growth. The measured growth parameters indicate that the length of the asymptotic (L∞) of this fish reaches 205.8 mm, while the growth coefficient (K) is obtained at 2.6 per year. The T0 value obtained empirically is -0.21, so that the Equation of Fish Growth with Formula:

${L_t = 205.80 [1 - e^{ - 2,6 (t + 0.21)}]}$

This equation can be used to predict the growth of Belanak fish in the waters of Selotong Village.

Mortality and Exploitation

The total mortality rate (Z) calculated for Belanak fish shows a value of 530,655, with natural mortality (M) of 2,014. Analysis of exploitation rate (E) shows a very high number, which is 99.6%. This indicates that most of the deaths of Belanak fish in the waters of Selotong Village are caused by fishing activities carried out by fishermen.

Conclusion

This study reveals important information about the morphometric character and aspects of the growth of Belanak fish in the waters of Selotong Village. The results show that Belanak fish have a fast growth pattern and high mortality rate due to catching. This information is very valuable for the management of sustainable fisheries resources, so it is expected to help in the preservation of Belanak fish species in the region.

Recommendations

Based on the results of this study, the following recommendations are made:

The government and local authorities should implement measures to reduce the mortality rate of Belanak fish due to fishing activities.
The fishing industry should adopt sustainable fishing practices to minimize the impact on the Belanak fish population.
Further research should be conducted to study the population dynamics of Belanak fish and to develop effective management strategies for the sustainable exploitation of this fish species.

Future Research Directions

This study provides a foundation for further research on the population dynamics of Belanak fish and the development of effective management strategies for the sustainable exploitation of this fish species. Future research should focus on the following areas:

Studying the population dynamics of Belanak fish, including the estimation of population size, growth rate, and mortality rate.
Developing effective management strategies for the sustainable exploitation of Belanak fish, including the implementation of catch limits, closed seasons, and habitat protection.
Investigating the impact of environmental factors, such as water temperature and pH, on the growth and mortality of Belanak fish.

Limitations of the Study

This study has several limitations that should be acknowledged:

The study was conducted in a limited area and may not be representative of the entire Belanak fish population.
The study relied on a limited number of samples, which may not be sufficient to accurately estimate the population dynamics of Belanak fish.
The study did not account for the impact of environmental factors, such as water temperature and pH, on the growth and mortality of Belanak fish.

Future Directions for Research

Studying the population dynamics of Belanak fish, including the estimation of population size, growth rate, and mortality rate.
Developing effective management strategies for the sustainable exploitation of Belanak fish, including the implementation of catch limits, closed seasons, and habitat protection.
Investigating the impact of environmental factors, such as water temperature and pH, on the growth and mortality of Belanak fish.

Conclusion

In conclusion, this study provides important information about the morphometric character and aspects of the growth of Belanak fish in the waters of Selotong Village. The results show that Belanak fish have a fast growth pattern and high mortality rate due to catching. This information is very valuable for the management of sustainable fisheries resources, so it is expected to help in the preservation of Belanak fish species in the region.
Frequently Asked Questions (FAQs) about Morphometric Character and Growth of Belanak Fish (Moolgarda Rule) in the Waters of Selotong Village, Secanggang District, Langkat Regency

Q: What is the purpose of this study?

A: The purpose of this study is to analyze the morphometric characters, aspects of growth, and mortality levels of Belanak fish in the waters of Selotong Village, Secanggang District, Langkat Regency.

Q: What are the morphometric characters of Belanak fish?

A: The morphometric characters of Belanak fish include 22 fish body parameters, such as total length, weight, and other physical characteristics.

Q: What is the growth pattern of Belanak fish?

A: The growth pattern of Belanak fish is allometric negative, meaning that the growth of the length of the liver fish is faster than the weight growth.

Q: What is the length of the asymptotic (L∞) of Belanak fish?

A: The length of the asymptotic (L∞) of Belanak fish is 205.8 mm.

Q: What is the growth coefficient (K) of Belanak fish?

A: The growth coefficient (K) of Belanak fish is 2.6 per year.

Q: What is the T0 value of Belanak fish?

A: The T0 value of Belanak fish is -0.21.

Q: What is the equation of fish growth for Belanak fish?

A: The equation of fish growth for Belanak fish is:

${L_t = 205.80 [1 - e^{ - 2,6 (t + 0.21)}]}$

Q: What is the total mortality rate (Z) of Belanak fish?

A: The total mortality rate (Z) of Belanak fish is 530,655.

Q: What is the natural mortality (M) of Belanak fish?

A: The natural mortality (M) of Belanak fish is 2,014.

Q: What is the exploitation rate (E) of Belanak fish?

A: The exploitation rate (E) of Belanak fish is 99.6%.

Q: What are the implications of this study for the management of sustainable fisheries resources?

A: The results of this study have important implications for the management of sustainable fisheries resources, as they indicate that Belanak fish have a fast growth pattern and high mortality rate due to catching.

Q: What are the recommendations for the management of Belanak fish?

A: The recommendations for the management of Belanak fish include implementing measures to reduce the mortality rate of Belanak fish due to fishing activities, adopting sustainable fishing practices, and further research on the population dynamics of Belanak fish.

Q: What are the future research directions for this study?

A: The future research directions for this study include studying the population dynamics of Belanak fish, developing effective management strategies for the sustainable exploitation of Belanak fish, and investigating the impact of environmental factors on the growth and mortality of Belanak fish.

Q: What are the limitations of this study?

A: The limitations of this study include the limited area of study, the limited number of samples, and the lack of consideration of environmental factors.

Q: What are the implications of this study for the conservation of Belanak fish?

A: The results of this study have important implications for the conservation of Belanak fish, as they indicate that this species is vulnerable to overfishing and requires effective management strategies to ensure its sustainability.