Impact of fishing pressure on reproductive biology of mackerel scad, Decapterus macarellus (Cuvier, 1833) in Sulawesi Sea and Maluku Sea, Indonesia

Retnoningtyas, Heidi and Agustina, Siska and Dhani, Arya Kusuma and Wiryawan, Budy and Palm, Harry W. and Natsir, Mohamad and Hartati, Intan Destianis and Prasetia, Rian and Yulianto, Irfan (2023) Impact of fishing pressure on reproductive biology of mackerel scad, Decapterus macarellus (Cuvier, 1833) in Sulawesi Sea and Maluku Sea, Indonesia. Asian Fisheries Science Journal (Malaysia), 36. pp. 164-170. ISSN 2073-3720

The high fishing pressure may cause species evolutionary changes toward smaller maturation sizes. In this context, the fishing practices of mackerel scad, Decapterus macarellus (Cuvier, 1833), in tropical eastern Indonesia provide an excellent opportunity to examine this hypothesis. Two distinct fishing grounds, the Sulawesi Sea and Maluku Sea, were selected to explore this phenomenon. Samples of D. macarellus caught by purse seine fishers operating were sourced from the two fishing grounds. Analysing the total length and maturity stage of each D. macarellus specimen from the two stocks were made to estimate key parameters such as the length at first maturity (Lm) and total mortality (Z). The results revealed that total mortality, used as an indicator of fishing pressure, was higher in the Maluku Sea (5.3 year-¹) than in the Sulawesi Sea (3.7 year-¹) and other areas. Additionally, the Lm of D. macarellus in the Maluku Sea was remarkably lower (22.9 cm) than in the Sulawesi Sea (23.9 cm), which can be attributed to the higher fishing pressure. These findings support the fisheries-induced evolution hypothesis, particularly within Indonesian tropical fish stocks and their respective regions, adding new growing evidence that fishing pressure affects fish reproductive biology. The length at first maturity may serve as a valuable proxy for assessing the intensity of fishing pressure on fish stocks.

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Abstract

The high fishing pressure may cause species evolutionary changes toward smaller maturation sizes. In this context, the fishing practices of mackerel scad, Decapterus macarellus (Cuvier, 1833), in tropical eastern Indonesia provide an excellent opportunity to examine this hypothesis. Two distinct fishing grounds, the Sulawesi Sea and Maluku Sea, were selected to explore this phenomenon. Samples of D. macarellus caught by purse seine fishers operating were sourced from the two fishing grounds. Analysing the total length and maturity stage of each D. macarellus specimen from the two stocks were made to estimate key parameters such as the length at first maturity (Lm) and total mortality (Z). The results revealed that total mortality, used as an indicator of fishing pressure, was higher in the Maluku Sea (5.3 year-¹) than in the Sulawesi Sea (3.7 year-¹) and other areas. Additionally, the Lm of D. macarellus in the Maluku Sea was remarkably lower (22.9 cm) than in the Sulawesi Sea (23.9 cm), which can be attributed to the higher fishing pressure. These findings support the fisheries-induced evolution hypothesis, particularly within Indonesian tropical fish stocks and their respective regions, adding new growing evidence that fishing pressure affects fish reproductive biology. The length at first maturity may serve as a valuable proxy for assessing the intensity of fishing pressure on fish stocks.

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Item Type:	Article
AGROVOC Term:	mackerel
AGROVOC Term:	Decapterus macarellus
AGROVOC Term:	marine fishes
AGROVOC Term:	pelagic fish
AGROVOC Term:	fisheries biology
AGROVOC Term:	sampling
AGROVOC Term:	data analysis
AGROVOC Term:	fishers
AGROVOC Term:	reproductive system
AGROVOC Term:	resource management
Geographical Term:	Indonesia
Depositing User:	Nor Hasnita Abdul Samat
Date Deposited:	10 Nov 2025 02:25
Last Modified:	10 Nov 2025 02:25
URI:	http://webagris.upm.edu.my/id/eprint/1324

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