Asri Mursawal, Arina Ruzanna, Sri Wahyuni

Morphometric Analysis of Ponyfish (Leiognathus daura) Landed at the PPI Cituis, Tangerang, Banten

Introduction

Morphometric analysis of ponyfish (leiognathus daura) landed at the ppi cituis, tangerang, banten. Analyze Ponyfish (Leiognathus daura) from PPI Cituis, Tangerang. This study covers morphometric analysis, length-weight relationship, and condition factors for fisheries biology and sustainable management.

Abstract

Leiognathus daura is a small pelagic fish that plays an important role in coastal ecosystems and has economic value for local communities. This study aimed to analyze the length–weight relationship, condition factors, and morphological characteristics of L. daura as a basis for fisheries biology information. A total of 30 specimens were examined morphometrically and meristically. The length–weight regression produced the equation y = 0.9073x + 0.2776 with a coefficient of determination (R²) of 0.2595. The value of b = 0.9073 (< 3) indicates a negative allometric growth pattern, meaning that length increases faster than body weight. Condition factors showed a Fulton's K value of 3.8036 and a relative condition factor (Wr) of 101.0081, suggesting that the fish population is healthy and supported by a favorable aquatic environment. Morphologically, L. daura has a laterally compressed body, small terminal mouth, large eyes, silvery scales, and a forked caudal fin, all of which support schooling behavior and adaptation to shallow coastal waters. The low R² value implies that body weight is influenced by length and environmental conditions, food availability, reproductive status, and fishing pressure. These findings highlight the importance of understanding the biological aspects of L. daura as a foundation for sustainable fisheries management in coastal ecosystems

Review

This study presents a timely and relevant morphometric analysis of *Leiognathus daura*, a species with acknowledged ecological and economic significance in the coastal waters of Tangerang, Banten. The authors effectively address a critical need for baseline fisheries biology information, focusing on the length–weight relationship, condition factors, and morphological characteristics. The multi-faceted approach adopted by the study provides initial, valuable data points for understanding the population dynamics and health of this small pelagic fish. This foundational information is crucial for local fisheries management and for tracking potential changes in the ecosystem. The findings reveal several key biological aspects of *L. daura*. The reported negative allometric growth pattern (b = 0.9073) indicates that length increases faster than body weight, a significant observation for understanding the species' life history strategy. While the condition factors (Fulton's K = 3.8036 and Wr = 101.0081) reassuringly suggest a healthy fish population thriving in a favorable environment, the exceptionally low coefficient of determination (R² = 0.2595) for the length-weight relationship stands out. Although the authors attribute this to a combination of environmental conditions, food availability, reproductive status, and fishing pressure, it underscores the need for more complex models or larger datasets to accurately predict body weight from length. Furthermore, the analysis was based on a relatively small sample size of 30 specimens, which, while providing initial insights, might limit the statistical robustness and broader applicability of some conclusions. Despite the inherent limitations of a preliminary study, these baseline data are invaluable for initiating sustainable fisheries management strategies in the region. The findings on growth patterns and condition factors provide a crucial starting point for informed decision-making regarding stock assessment and conservation efforts. To enhance these insights, future research could significantly benefit from incorporating larger, seasonally stratified sample sizes, investigating reproductive dynamics, and explicitly correlating environmental parameters or local fishing effort with the observed variations in growth and condition. This study lays a commendable foundation, highlighting the complex interplay of biological and environmental factors that govern the health and dynamics of *L. daura* populations.

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