Study on natural short-necked clam, Ruditapes philippinarum, stocks in Yeongheung coast of Wando Island, Korea

Cho, Sang-Man; Lee, Jong Hwa

doi:10.9710/kjm.2012.28.2.109

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…의 생식소발달과 연령 및 성장 연구 (Chung et al, 1994), 진해 연안산 바지락의 자원생태학적 연구 (Kim and Zhang, 1999), 용존산소의 변화에 따른 바지락의 생리적 반응 연구 (Shin et al, 2001), 한산도 진두해역 양식 바지락의 자원생 태학적 연구 (Cho and Jeong, 2007), 통영 연기해역의 바지 락자원 적정관리에 관한 연구 (Cho et al, 2008) 등이 있고, 국외에서는 러시아 Amursky 만의 바지락의 개체군 구조와 성장연구 (Ponurovskii, 2008), 중국 Jiaozhou만에 이식한 바지락 성장과 관련한 연구 (Ren et al, 2008), 바지락의 서 식환경에 대한 실험연구 (Coughlan et al, 2009) …”

Section: 바지락에 관한 국내 연구로는 김제연안에 서식하는 바지락unclassified

The study of stock assessment and management implications of the Manila clam, Ruditapes philippinarum in Taehwa river of Ulsan

Choi¹,

Yoon²,

Lee³

et al. 2011

The Korean Journal of Malacology

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The manila clam (Ruditapes philippinarum) is mainly distributed in the coastal area which consist of mud, sand and gravel, but they rarely live on the upper and down reaches of river. For a long time the manila clam has been inhabited in Taehwa river which has been exploited as a traditional earning resources and has become as a major object by neighborhood fishermen. This study was undertaken to evaluate stock assessment and to build management implications with the ecological parameters in Taehwa river from June 2009 to June 2010. The maximum age of manila clam was determined to 6 years old from observing ring radius of shell, the length and weight relationship was TW = 0.0002SL 3.063 (R 2 = 0.925). K and L∞ were respectively estimated 46.64 mm and 0.341/year by von Bertalanffy growth. The instantaneous total mortality was estimated to be 1.171/year and the age at first capture was 1.37 years by the Pauly's method using shell length composition. The current total biomass of manila clam was calculated 1,483 mt over study area 1.46 km 2 by swept area method. ABC (Acceptable Biological Catch) estimates of manila clam showed 512 mt with using F0.1. It's desirable to determine the optimum harvesting time as after main spawning season, as well as it's required to manage fisheries resources considering capture age and biomass through adjusting a first age at capture.

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Section: 바지락에 관한 국내 연구로는 김제연안에 서식하는 바지락unclassified

The study of stock assessment and management implications of the Manila clam, Ruditapes philippinarum in Taehwa river of Ulsan

Choi¹,

Yoon²,

Lee³

et al. 2011

The Korean Journal of Malacology

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“…In general, the spawning used in the SSB and SPR is defined as the sum of the values obtained by multiplying mean body weight and adult stock abundance for female by age, under the assumption that the body weight is proportional to egg output. However, the number of spawning seasons in an R. philippinarum population is 1–3 per year based on histological observations of the gonads (Chung et al, 1994; Laruelle et al, 1994; Matsumoto et al, 2014), but R. philippinarum can spawn approximately once every 2 weeks in the laboratory (Chung et al, 2001; Toba & Miyama, 1994). Therefore, 1–3 spawnings per year per individual may be an underestimation, but the exact number or range is unknown.…”

Section: Introductionmentioning

confidence: 99%

A state‐space model to estimate spawning rates in a Ruditapes philippinarum population

Hanyu¹

2023

Population Ecology

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The Ruditapes philippinarum catch in Japan has drastically declined and its recovery is a major challenge. The spawning rates and egg output need to be estimated to discuss stock management strategies. However, it is difficult to observe these directly in a field survey. This study proposes a state-space model to estimate spawning rates in an R. philippinarum population using the number of individuals at each developmental stage based on traditional histological observations of the gonads. An example of its application to monthly observed data of an R. philippinarum population on the western Japanese coast is also presented. The spawning seasons were quantitatively detected in spring and fall, and the durations were estimated to be 2.8 months in spring and 3.0-3.5 months in fall, based on the spawning rates. The mean condition factor was lower in fall than in spring, but females with a high condition factor were also found in fall. The egg output of these individuals during the fall may be large. The spawning frequency per individual was estimated to be 6.5 times per year based on the model, indicating that R. philippinarum is an r-strategy species capable of multiple spawning. Questioning how the spawning rates vary with individual size/age and environmental conditions is essential for estimating egg output in R. philippinarum populations. The state-space model in this study can contribute to the quantification of spawning rates. The results will contribute to estimating the egg output and stock management strategies.

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Study on natural short-necked clam, Ruditapes philippinarum, stocks in Yeongheung coast of Wando Island, Korea

Abstract: ABSTRACT

Cited by 2 publications

References 5 publications

The study of stock assessment and management implications of the Manila clam, Ruditapes philippinarum in Taehwa river of Ulsan

The study of stock assessment and management implications of the Manila clam, Ruditapes philippinarum in Taehwa river of Ulsan

A state‐space model to estimate spawning rates in a Ruditapes philippinarum population

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