Indonesian Journal of Forestry Research
Vol. 13 No. 2 (2026): Indonesian Journal of Forestry Research

REGRESSION MODEL ANALYSIS FOR DETERMINATION OF Amyda Cartilaginea MAXIMUM BREEDING AGE

Vivin Silvaliandra Sihombing (Research Center for Ecology, National Research and Innovation Agency)
Rozza Tri Kwatrina (Research Center for Ecology, National Research and Innovation Agency)
Yanto Santosa (Division of Bioprospecting and Sustainable Wildlife Utilization, Department of Forest Resources Conservation and Ecotourism, Faculty of Forestry and Environment, IPB University)
Anita Rianti (Research Center for Ecology, National Research and Innovation Agency)



Article Info

Publish Date
25 Oct 2026

Abstract

Harvest quota of Asiatic softshell turtle (Amyda cartilaginea) in Indonesia is the largest in the world. This has an impact on the decline in wildlife populations, given the lack of ex-situ conservation efforts and the fact that exporters prefer to take from nature. Information on the reproductive biology of the turtles is very important as a basis for conservation by estimating the speed of reproduction in order to maintain their population in nature. The purpose of this study was to determine the relationship between body weight and number of eggs on morphometric variations of the Asiatic softshell turtle (A. cartilaginea) as the basis for determining the maximum reproductive age. The method used is observational by measuring morphometric with Curved Carapace Length (CCL), Curved Carapace Width (CCW), Plastron Lenght (PL) and Plastron Width (PW) techniques. The results showed that the weight of the female ranged from 3 to 7.3 kg, CCL 20-48.4 cm,  CCW 17.3-31.6 cm, PL 19.6-35.8 cm, and PW 17-34.5 cm. Weight (Y) is positively correlated with CCL (X) with the equation Y = 4.031X + 4.1885. The number of eggs (Y) can be estimated from Body Weight (X) with the allometric formula Y = 0.0117 X + 2.9424. These results indicate that the strongest correlation to the number of eggs is CCL. The age structure that produces the most eggs with good quality is from the adult age structure (CCL 35-40 cm) so that it can be recommended as a superior female for captivity.

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Journal Info

Abbrev

ijfr

Publisher

Subject

Agriculture, Biological Sciences & Forestry

Description

Indonesian Journal of Forestry Research (IJFR) was first published as Journal of Forestry Research (JFR) in November 2004 (ISSN 0216-0919). The last issue of JFR was published in December 2013. The Journal has been accredited by the Indonesian Institute of Sciences since 2008 and by the Ministry of ...