Sex ratio, age group and length at first maturity of mackerel scad (Decapterus macarellus Cuvier, 1833) in the Southern waters of Ambon, Eastern Indonesia

Silooy, Frentje D.; Tupamahu, Agustinus; Ongkers, O. T. S.; Haruna,; Matrutty, Delly Dominggas Paulina; Pattikawa, J A

doi:10.1088/1755-1315/777/1/012008

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…The dominance of female D. kurroides in the randomly collected samples was also observed in other round scad species, such as the Decapterus russelli in Malabar Coast, India (Manojkumar 2005) and Decapterus macarellus in Ambon, Indonesia (Silooy et al 2021). The deviation from the 1:1 ratio is unlikely for most aquatic organisms, such as fishes (Khatun et al 2018).…”

Section: Discussionmentioning

confidence: 67%

First Report on the Reproductive Biology of the Redtail Scad Decapterus kurroides Bleeker, 1855 in Iligan Bay, Southern Philippines

Dela Rosa,

Quiñones,

Jimenez

et al. 2022

TPJF

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This study provided the first report on the reproductive biology of the redtail scad, Decapterus kurroides. The reproductive activity of the redtail scad was assessed to characterize its sex ratio, spawning period, length at maturity, and fecundity. Meanwhile, remote sensing data on environmental variables were accessed from Giovanni online data system. Fish samples were collected monthly from October 2017 to September 2018 from both commercial and municipal landed catches. Male D. kurroides was found to have a larger size than the female in terms of mean total length and mean body weight, but it did not differ significantly from the female (t = 1.31, df = 1,348, p = 0.19). Collected male and female samples were mostly in the 15.1 – 18.0 cm size class. Overall sex ratio exhibited female dominance (1.2:1), which significantly deviated from the 1:1 ratio (x2 = 8.17, p = <0.05). As expected for tropical fish, spawning of D. kurroides occurred year-round, with peak spawning in December and minor spawning events in March and August, as reflected in the monthly percent occurrence of different gonad maturity stages and gonadosomatic index evolution. Among the environmental variables evaluated, sea surface temperature appeared to have more influence on the spawning of D. kurroides followed by chlorophyll-a concentration. Females matured at a length of 17.2 cm, while males matured at a length of 17.6 cm. Absolute fecundity ranged from 6,416 to 197,672 eggs per female with a mean of 61,733 ± 3,955 and increased proportionally with gonad weight. Information from this study may be used to formulate effective management strategies for the resource.

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Section: Discussionmentioning

confidence: 67%

First Report on the Reproductive Biology of the Redtail Scad Decapterus kurroides Bleeker, 1855 in Iligan Bay, Southern Philippines

Dela Rosa,

Quiñones,

Jimenez

et al. 2022

TPJF

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“…To date, it has been reported that there are 11 valid species of roundscads worldwide (Froese & Pauly, 2022) and 8 of those species occur in Indonesian waters, namely D. akaadsi, D. kurroides, D. macarellus, D. macrosoma, D. maruadsi, D. muroadsi, D. russelli and D. tabl (Baweleng et al, 2018;Dahlan et al, 2015;Firdaus et al, 2020;Latumeten et al, 2019;Ongkers et al, 2016;Pattikawa et al, 2017Pattikawa et al, , 2018Purnama, 2020;Silooy et al, 2021;Umar et al, 2019). Latumeten et al (2019) in their research in Doreri Bay, Manokwari found 3 species of roundscads caught by lift net, namely D. akaadsi, D. macarellus and D. macrosoma.…”

Section: Species Compositionmentioning

confidence: 99%

“…In addition, Pattikawa et al (2018) found a total length ranging from 11.0-24.5 cm and Silooy et al (2019) reported a range of 9.0-31.9 cm for this species in the waters of Ambon Island. According to Silooy et al (2021), first matured gonads of this species at 24.9 cm (male) and 24.8 cm (female). Based on this information, it can be concluded that most of the D. macarellus sold in the traditional fish market of Langgur City are…”

Section: Size Distributionmentioning

confidence: 99%

“…Research on roundscads has been widely carried out in the waters of Maluku Province, Eastern Indonesia. However, the studies conducted have focused more on certain species of the genus Decapterus or concentrated in the waters around Ambon Island and Seram Island, Northern part of Maluku Province (Ongkers et al, 2016;Pattikawa et al, 2017Pattikawa et al, , 2018Purnama, 2020;Silooy et al, 2021;Soumokil, 2002;Syahailatua & Sumadhiharga, 1991). Based on the literature search, research on roundscads in southeastern parts of Maluku Province such as in the waters of the Aru islands, Kei islands and Tanimbar islands is very rare, maybe even not available until now.…”

Section: Introductionmentioning

confidence: 99%

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Biological aspects of roundscads (Decapterus spp.) inhabiting the waters of Southeast Maluku, Eastern Indonesia

Pattikawa¹,

Bertha²,

Stephan³

et al. 2023

Fish Aquat Sci

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This research was conducted at Langgur City, Southeast Maluku Regency, Maluku Province, Eastern Indonesia from November 2020 to February 2021 to study biological aspects of roundscads (Decapterus spp.) which consist of species composition, sex ratio, gonad maturation level, size distribution, length-weight relationship and condition factor. Samples were collected at traditional fish market in Langgur City. Fish samples collected at the market were put into cool box and then brought to the laboratory for further examination. Fish samples were identified, separated based on species, dissected to determine their sex and gonad maturation stage and then measured. Totally, there were 290 specimen collected which consist of five species namely Decapterus kurroides, D. macarellus, D. macrosoma, D. muroadsi and D. russelli. Sex ratio between male and female for all species showed 1:1. Gonad maturation level showed that stage I and II have higher percentage than stage III and IV indicates immature fish more dominant compare to mature one. Among five species found, D. macarellus has larger size while the smaller belongs to D. muroadsi. Results of length-weight relationship analysis showed that roundscads inhabiting Southeast Maluku waters have isometric and negative allometric growth pattern with relative condition factor around 1.00.

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“…The main commercial fish species caught by this fishery in deeper waters of the South China Sea are tuna (family Scombridae) and tuna‐like species and scads (dominated by Mackerel Scad Decapterus macarellus and Shortfin Scad D. macrosoma ) (Zhang et al 2016a; Su et al 2018). These fish stocks are made up of highly migratory species and are exploited by several countries around the South China Sea (Zhang et al 2016b; Tadjuddah et al 2017; Su et al 2018; Silooy et al 2021). Unfortunately, most of them have not been assessed because of a lack of data.…”

Section: Introductionmentioning

confidence: 99%

The initial assessment of an important pelagic fish, Mackerel Scad, in the South China Sea using data‐poor length‐based methods

Xu,

Zhang,

Panhwar

et al. 2023

Mar Coast Fish

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ObjectiveScads Decapterus spp. occur widely throughout tropical, subtropical, and temperate oceans and are both economically and ecologically important species. They are among the main commercial fish species caught by the light falling‐net fishery in the South China Sea, which is dominated by Mackerel Scad Decapterus macarellus and Shortfin Scad D. macrosoma. Stock assessment is an approach used to guide effective management and maintain fishery sustainability.MethodsTwo data‐poor methods, namely length‐based Bayesian biomass estimation and length‐based spawning potential ratio, were applied to assess the status of Mackerel Scad, the most dominant Decapterus species in the South China Sea. Electronic length–frequency analysis was used to estimate von Bertalanffy growth parameters (asymptotic length Linf and growth coefficient K) to serve as priors.ResultThe results show the estimated Linf and K of Mackerel Scad in the South China Sea as 36.0 cm and 0.37/year, respectively. Estimated natural mortality was 0.74/year, and mean fork length at 50% sexual maturity was 24.29 cm. Length‐based Bayesian biomass estimation analysis showed that the estimated relative stock size had decreased from 1.3 in 2012–2014 to 0.7 in 2019–2021, indicating an overfished status. Length‐based spawning potential ratio analysis showed that the estimated spawning potential ratio for this fishery decreased from 13% to 12%, which is significantly below the limit reference point of 20%.ConclusionOur results obtained through length‐based methods indicate the lower SPR of Mackerel Scad stock was due to catching an excess of juveniles. Therefore, we highlight the need to increase the minimum mesh size in the fishing nets and strengthen international cooperation for conserving this shared stock in the South China Sea.

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Sex ratio, age group and length at first maturity of mackerel scad (Decapterus macarellus Cuvier, 1833) in the Southern waters of Ambon, Eastern Indonesia

Cited by 6 publications

References 5 publications

First Report on the Reproductive Biology of the Redtail Scad Decapterus kurroides Bleeker, 1855 in Iligan Bay, Southern Philippines

First Report on the Reproductive Biology of the Redtail Scad Decapterus kurroides Bleeker, 1855 in Iligan Bay, Southern Philippines

Biological aspects of roundscads (Decapterus spp.) inhabiting the waters of Southeast Maluku, Eastern Indonesia

The initial assessment of an important pelagic fish, Mackerel Scad, in the South China Sea using data‐poor length‐based methods

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