Beberapa Aspek Reproduksi Siput Lambis lambis di Pesisir Perairan Yenusi, Biak

Andriani Widyastuti, Ludi Parwadani Aji

Abstract


Some Aspects of Reproduction in Conch Lambis lambis of Yenusi Coastal Waters, Biak. Lambis lambis is a very popular conch species that has been harvested in all sizes encountered. This condition is very alarming because in the long term, its existence in nature will be reduced because there is no chance to reproduce naturally. This study aims to determine the sex ratio and gonad maturity levels of L. lambis in Yenusi waters, so the appropriate time of harvest can be arranged. Samples were collected every month from January to December 2013. Testing and histological analysis were performed in the laboratory. Samples collected were 99 individus with the number of males 45 individus and females 54 individus. The sex ratio of males and females was 1.0:1.2. Gonad maturity level found included all four stages of gonadal development, from TKG I to TKG IV. Gonadal development showed the process of formation and maturation, and the spawning occured throughout the year, with peak spawning in January until March 2013. The size of the shell length obtained ranged from 4.55 to 13.72 cm indicating over-exploitation. Due to the custom local where residents harvested the conches in all sizes found, sustainable management strategies are urgently needed, including moratorium period  when L. lambis is at the peak of spawning, and harvest should only be performed on adult individuals with a minimum shell size of 7 cm, while observing the thickness of the shell and marginal digitations have been formed.




Keywords


Lambis lambis, aspects of reproduction, gonad development, spawning

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References


Aranda DA & L Frenkiel. 2007. Lip Thickness of Strombus gigas (Mollusca: Gastropoda) Versus Maturity: A Management Measure. 58th Gulf and Caribbean Fisheries Institute. (http://zoolstud.sinica.edu.tw, diakses tanggal 12 November 2012).

Bellchambers LM, MB Pember & SN Evans. 2013. Distribution, Abundance and Reproductive Biology of Lambis lambis (gonggong) at the Cocos (Keeling) Island in A Summary of Department of Fisheries, Western Australia Invertebrate Research at Cocos (Keeling) Island 2006–2011. Fisheries Research Report No.239,2013. Fisheries Research Division. Western Australian Fisheries and Marine Research Laboratories. 68 pp.

Carpenter KE & VH Niem. 1998. FAO Species Identification Guide for Fishery Purposes. The Living Marine Resources of The Western Central Pacific. Volume 1 Seaweed, corals, bivalves and gastropods. Food and Agriculture Organization of The United Nations, Rome.

Cob ZC, A Arshada, JS Bujang, WLW Muda & MA Ghaffar. 2008. Sexual Maturity and Sex Determination in Strombus canarium Linnaeus, 1758 (Gastropoda: Strombidae). Journal of Biological Sciences, 8(3): 616–621.

Cob ZC, A Arshada, JS Bujang, WLW Muda & MA Ghaffar. 2009. Age, Grouth, Mortality and Population Structure of Strombus canarium (Gastropoda: Strombidae): Variations in Male and Female Sub-Populations. Journal of Applied Sciences, 9(18): 3287–3297.

Cob ZC, A Arshada, JS Bujang, WLW Muda & MA Ghaffar. 2010. Metamorphosis Induction of the Dog Conch Strombus canarium (Gastropoda: Strombidae) Using Cues Associated with Conch Nursery Habitat. Journal of Applied Sciences, 10(8): 628–635.

Efendie MI. 1992. Metoda Biologi Perikanan. Yayasan Agromedia. Bogor. 112 pp.

Egan BD. 1985. Aspects of the Reproductive Biology of Strombus gigas. Thesis in the Faculty of Graduate Studies (Department of Zoology) The University of British Columbia. Vancouver, Canada.

Jaikumar M, R Ramkumar, Gunalan, L Kanagu. 2011. Length-weigth Relationship of Lambis lambis (Mollusc: Gastropoda) from Tuticorin Coastal Waters, Gulf of Mannar, Southeast Coast of India. World Apllied Sciences Journal, 14(2): 207–209. (http://www.idosi.org, diakses tanggal 4 Maret 2015).

Mazo AM, BP Germano, AS Ilano. 2013. Spawning Period and Size at Sexual Maturity of Spider Conch Lambis lambis (L. 1758) (Gastropoda: Strombidae), in Selected Reef Areas of the Visayas, Central Philippines. Silliman Journal, 54(1): 64–76. (http://s3.amazonaws.com, diakses tanggal 5 Agustus 2016).

Poutier JM. 1998. Gastropods in the Living Marine Resources of the Western Central Pasific Volume 1. FAO Species Identification Guide for Fishery Pusposes. ISSN 1020-4547. Food and Agriculture Organization of the United Nations. Rome.

Power AJ, J Nunez, M Mitchell, RL Walker & L Sturmer. 2004. Reproductive Pattern of the Blood Ark Anadara ovalis from the northeast coast of Florida. Journal of Shell Fisheries Research, 23(1): 173–178.

Raber S. 2013. Evidence of Selective Breeding and Habitat Use in Lambis lambis. Poster Department of Biology. Nothern Arizona University. (http://nau.edu, diakses tanggal 5 Agustus 2016).

Reed SE. 1991. Reproductive Anatomy and Biology of the Genus Strombus in the Caribbean: I. Males. Proceeding of the 44th Gulf and Caribbean Fisheries Institute: 427–438.

Reed SE. 1993. Gonadal Comparison of Masculinized Females and Androgynous Males to Normal Males and Females in Strombus (Mesogastropoda: Strombidae). Journal of Shellfish Research, 12(1): 71–75.

Reynal L, ME Diaz & DA Aranda. 2009. First Result of Reproductive Cycle of Deep-sea Queen Conch, Strombus gigas, from FWI, Martinique. Proceeding of the 61st Gulf and Caribbean Fisheries Institute. Gosier, Guadeloupe, French West Indies. GCFI, 61: 506–508.

Sudjana, 1992. Metode Statistika. Penerbit Tarsito. Bandung.


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