Environmental damage from anthropogenic activity will lead to a decrease in water quality, which then affects aquatic organisms including Gastropoda. So it is necessary to do a study of diversity and abundance of gastropods in East Bangka Island.The study was conducted from June to December 2017. The research locations were divided into 6 stations. Data collection of gastropods using squares of size 50 cm x 50 cm, performed by direct gastropod removal by hand, then identified in Water Resource Management Laboratory. The results of this study found 12 species of gastropods from 8 families. The families found are Cerithideidae (2 species), Cerithiidae (1 species), Cirridae (1 species), Nassariidae (2 species), Neritidae (2 species), Planaxidae (1 species), Muricidae (1 Species) and Costellariidae (2 Species ). The highest abundance of gastropods is Certhidea cingulata species with an average abundance of 124.54 ind / m2. The value of diversity index of gastropod in the eastern part of the island of Bangka categorized small, it is thought to be caused by loss of habitat as a result of mining activities at sea. Keywords: Gastropods, Diversity, Abundance, Intertidal Zone

Bivalvia merupakan memiliki peran penting baik ditinjau dari nilai ekologi dan ekonomi. Tingginya nilai ekonomi dapat menyebabkan terjadinya eksploitasi secara berlebihan (overexploitation), kemudian berdampak pada ancaman hewan tersebut di alam.  Kondisi ini sehingga perlu dilakukan penelitian dasar yang berkaitan dengan kepadatan, keanekaragaman dan pola sebaran bivalvia di Pulau semujur. Penelitian dilakukan pada bulan Februari sampai April 2018 di Pulau Semujur, Kepulauan Bangka Belitung. Pengambilan data di lapangan meliputi, pengambilan sampel bivalvia, pengukuran parameter fisika kimia perairan dan identifikasi vegetasi lamun. Pengambilan data bivalvia menggunakan kuadrat berukuran 0,5 cm x 0,5 cm. Bivalvia ditemukan di Pulau Semujur sebanyak  8 spesies dari 4 famili. Kepadatan bivalvia di Pulau semujur berkisar 8,4 ind/m2 s.d 21.2 ind/m2. Indeks keanekaragaman (H’) bivalvia berkisar 1,54 s.d 2,184 yang dikategorikan keanekaragaman sedang. Indeks keseragaman (E) di berkisar antara 2,55 s.d 3,22, dikategorikan keseragaman tinggi. Selain itu dilihat dari indeks dominansi bivalvia di Pulau semujur dikategorikan rendah, karena nilai indek dominansi <0,5. Pola sebaran bivalvia bervariasi disetiap spesies ada pola sebaran seragam, acak dan mengelompok. Pola sebaran bivalvia menglompok terdiri dari spesies G.  tumidum, T. palatum dan T. magnum. Pola sebaran acak terdiri dari spesies A. antiquata, G. dispar dan T.vigrata, sedangkan pola sebaran seragam yaitu T. spengleri dan B.  lacerata

Dog conch (Strombus turturella) is one of important sources of fishery commodities with  high economic values in Bangka Belitung. The needs of Dog conch as consumption still depends on fishermen harvest since its aquaculture has not been cultured until now. This study aims at determining behavior and feeding habit of dog conch. The study was conducted in July 2014 to January 2015. The experiments passed some stages 1) samples was taken in the field by hand collecting, 2) the experiment of seagrass consumed preference, 3) feeding behavior, and 4) Analysis of the stomach contents. The results indicate dog conch does not consume seagrass immediately, but detritus and microalgae species of Thalassiosira sp., Synedra sp., Nitzschia sp., Navicula sp. Dog conch eats by put the probiosis of the shell, then it grinds sediment layer, seagrass leaves and shells of other individuals as source if food. Dog conch behavior from beginning to  ending of the observation includes several stages: 1) Initial treatment actively foraging, 2) Individuals dog conch assembled or in pairs, 3) on the second day, the dog conch hoards himself on the base of the substrate and only elastic probiosis which occasionally appear occasionally at the substrate bottom.

Ikan ekor kuning (Caesio cuning) salah satu jenis ikan karang dari famili Caesionidae, yang menjadi target penangkapan dengan bubu di Pelabuhan Perikanan Nusantara Sungailiat. Ikan ekor kuning memiliki nilai ekonomis penting. Informasi tentang aspek reproduksi ikan ekor kuning (Caesio cuning) diperlukan untuk pengelolaan yang berkelanjutan. Penelitian ini bertujuan untuk mengetahui aspek reproduksi ikan ekor kuning pada bulan Januari sampai Maret yang meliputi Rasio Kelamin (sex ratio), Tingkat Kematangan Gonad (TKG), Indeks Kematangan Gonad (IKG), Fekunditas, dan menganalisis umur ikan. Pengambilan sampel dilakukan pada bulan Januari sampai Maret 2019 di Pelabuhan Perikanan Nusantara Sungailiat dengan menggunakan metode random sampling. Hasil penelitian selama tiga bulan ini menunjukkan bahwa nilai rasio kelamin ikan ekor kuning jantan dan betina yaitu 1:1,032 yang berada pada tingkat kematangan I sampai dengan tingkat kematangan gonad IV. Nilai IKG ikan ekor kuning jantan berkisar antara 0,014% - 4,712% dan untuk betina antara 0,014% - 7,784%. Fekunditas ikan ekor kuning betina berkisar antara 5.523 – 49.987 butir dan memiliki umur 1 tahun dan 2 tahun, dimana panjang tubuh ikan sangat mempengaruhi umur ikan.REPRODUCTIVE ASPECTS AND AGE OF YELLOW-TAILED FISH (Caesio Cuning) LANDED AT SUNGAILIAT ARCHIPELAGO FISHING PORT IN BANGKA REGENCY. Reproductive aspects of yellow-tailed fish which are landed in the Pelabuhan Perikanan Nusantara Sungailiat in Bangka Regency. Yellow-tailed fish (Caesio cuning) is one type of reef fish from the Caesionidae family, which is the target of catching fish at the Pelabuhan Perikanan Nusantara Sungailiat. Yellow tail fish has important economic value. Information about the reproductive aspects of yellow tail fish (Caesio cuning) is  needed for sustainable management. This study aims to determine the reproductive aspects of yellow tailed fish from January to March which include sex ratio, gonad maturity level, gonad somatic index, fecundity, and analyze the age of fish. Sampling was carried out from January to March 2019 at the Pelabuhan Perikanan Nusantara Sungailiat used the random sampling method. The results of this three-month study showed that the sex ratio of yellow-tailed fish male and female were 1: 1,032 which at the level of maturity I to the level of gonad maturity IV. The value of GSI male yellow-tailed fish ranges from 0.014% - 4.712% and females between 0.014% - 7.784%. The fecundity of female yellow-tailed fish ranges from 5,523 - 49,987 grains and yellow-tailed fish has age 1 year and 2 years, where the body length of fish greatly affects the age of fish.

The purpose of this study is to determine the water quality analysis in South Bangka Regency, especially the coastal area, by analyzing the physical-chemical conditions and suitability of salt pond locations. The location of study was conducted in the coastal area of Mempunai, Batu Perahu, Kubu, Tanjung Kemirai, and Puding. The location of study was conducted in the coastal area of Mempunai, Batu Perahu, Kubu, Tanjung Kemirai, and Puding. During the present investigation the minimun and maximum value of water temperature (29 – 32oC), brightness (0,32 – 0,87 m), current (0 – 0,35 m/s), tidal are commonly diurnal (one high and one low tide each day), pH (6,7 – 8,2), salinity (30 – 33,2 o/oo) These areas are dominated by sand and clay. The result of salt pond location suitability analysis is based on water quality in the coastal area. Mempunai, Kubu, Tanjung Kemirai and Puding Beach generally quite-appropriate for salt pond location, different with coastal area of Batu Perahu have inappropriate category for suitability of salt pond location