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I.
PENDAHULUAN
Segara Anakan merupakan laguna yang dikelilingi oleh mangrove dengan substrat berlumpur yang berupa lempung dan lanau yang bercampur dengan material organik dan membentuk endapan alluvial (Yuwono et al., 2007). Laguna tersebut terletak di Pantai Selatan Pulau Jawa dan secara administratif masuk dalam wilayah Kecamatan Kampung Laut Kabupaten Cilacap dengan koordinat 07º34’29.42” – 07º47’32.39” LS dan 108º46’30.12” – 109º03’21.02” BT. Luas wilayah Segara Anakan mencapai 34.018 ha (Ardli et al., 2010). Daerah yang terlindung pada ekosistem Laguna Segara Anakan tersebut menyebabkan perairan ini menjadi relatif tenang dan memungkinkan beragam organisme hidup di daerah tersebut (Dudley et al., 2000).
Ekosistem mangrove merupakan salah satu ekosistem utama di perairan estuarin yang memiliki sumberdaya hayati yang dapat dimanfaatkan oleh masyarakat dalam menunjang kehidupan dan kesejahteraannya secara berkesinambungan (Tis’in, 2008). Ditinjau dari sisi ekologis, kawasan ini dihuni oleh beragam biota, baik dari darat maupun laut, serta fauna khas penghuni ekosistem mangrove. Secara garis besar fauna yang menghuni kawasan hutan mangrove dapat dikategorikan ke dalam kelompok pendatang dan penghuni asli. Kelompok pendatang adalah fauna yang
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Herawati (2008) menyatakan bahwa, hutan mangrove di Segara Anakan Cilacap memiliki potensi perikanan kerang yang cukup besar namun data mengenai besarnya hasil tangkapan nelayan hingga sekarang ini tidak ada. Sementara kenyataan di lapangan menunjukkan tingkat konsumsi masyarakat akan kerang ini semakin
meningkat
sebagai
sumber
protein
hewani
yang
berarti
bahwa
kecenderungan frekuensi penangkapan akan semakin tinggi. Salah satu kerang yang banyak terdapat di daerah tersebut adalah kerang totok atau kepah ( Polymesoda erosa). Kerang digunakan oleh masyarakat sekitar sebagai salah satu sumberdaya
pangan alternatif yang potensial. Kerang dimanfaatkan untuk meningkatkan konsumsi gizi walaupun masih mengandalkan hasil tangkapan dari alam dan belum didukung oleh sektor budidaya. Menurut Morton (1984), sedikitnya terdapat 3 jenis kerang dari genus Polymesoda yaitu: Polymesoda erosa, Polymesoda expansa, dan Polymesoda bengalensis. Polymesoda erosa adalah satu dari ketiga spesies tersebut yang paling
umum dijumpai di kawasan Hutan Mangrove Segara Anakan (Sudibyaningsih, 2001; Hartati et al., 2005; Widowati et al., 2005). Habitat alami dari kerang totok tersebut diduga telah mengalami penurunan kualitas lingkungan akibat sedimentasi dan eksploitasi vegetasi mangrove. Sedimentasi di Laguna Segara Anakan menurut Saputra (2003), t erutama berasal dari
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Polymesoda erosa merupakan Filum Moluska dalam kelas bivalvia yang
hidup di ekosistem mangrove pada substrat lanau berpasir ( sandy slit ), ), dapat hidup dengan kondisi pH rendah (5,35 – 6,04) serta fluktuasi salinitas yang besar. Kerang ini mampu bertoleransi pada suhu 0 - 40° C. Polymesoda erosa banyak dijumpai pada substrat yang didominasi vegetasi Derris trifoliata, Acanthus ilicifolius dan Rhizphora sp. Polymesoda erosa umumnya terdapat pada daerah beriklim sedang
dan tropis. Oleh karena itu Polymesoda erosa dapat dijumpai pada hutan mangrove Indo-Pasifik Barat mulai dari India, Hongkong, Malaysia, Indonesia, Thailand, Vietnam, Burma, Philipina (Morton, 1984); hingga Australia Utara (Gimin et al., 2004). Di Indonesia, Polymesoda erosa dilaporkan terdapat di hutan mangrove Papua dan Sulawesi (Dwiono, 2003; Freeport, 2007); Aceh (Ali, 2007); Jawa Barat, Kalimantan (Nova, komunikasi pribadi; Anwar et al., 2009) dan Laguna Segara Anakan Cilacap, Jawa Tengah (BCEOM, 2003; Widowati et al., 2005). Menurut Morton (1986) morfologi kerang totok mempunyai ciri-ciri hampir bulat (orbicular ), ), tebal, besar, flexure jelas mulai dari umbo sampai tepi posterior, mempunyai satu atau dua lekukan. Barnes & Rupet (1991) menjelaskan bahwa lapisan luar ( periostrakum) berwarna hijau kehitaman dan bagian dalam berwarna putih porselin. Secara morfologi kedua keping cangkang itu berfungsi untuk melindungi tubuh lunaknya dari serangan predator dan faktor lingkungan, mengatur
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Gambar 1. Morfologi dan anatomi Polymesoda erosa erosa (Paul, 2001)
Adapun Klasifikasi Polymesoda erosa menurut Jutting (1954) : Filum
: Mollusca
Kelas
: Bivalvia
Sub Kelas
: Heterodonta
Ordo
: Veroida
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pakan alami, zooplankton juga merupakan pakan alami bagi organisme perairan. Keberadaan Keberadaan zooplankton pada perairan estuaria dipengaruhi oleh adanya fitoplankton yang ada sebagai sumber pakannya (Froneman, 2004). Kondisi lingkungan estuaria sangat mendukung bagi perkembangan organisme perairan termasuk Polymesoda erosa serta pakan alami, karena estuaria baik secara fisik-kimia perairan maupun sebagai lingkungan kaya akan sumber pakan alami untuk perkembangan organisme perairan. Makanan mempunyai fungsi penting bagi suatu organisme, karena suatu organisme dapat bertahan hidup, tumbuh, dan berkembang karena adanya energi dari makanan (Walne, 1979). Ditambahkan oleh Hari
(1999),
bahwa
makanan
bivalvia
terdiri
dari
partikel
organik
dan
mikroorganisme dalam air. Tidak semua jenis makanan akan dimakan oleh bivalvia, tergantung pada beberapa faktor misalnya ukuran makanan, ketersediaan makanan dan selera makan. Selanjutnya jumlah makanan akan tergantung pada kebutuhan dan pengaruh lingkungan. Ketersediaan makanan dilingkungan akan sangat menentukan
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lebih dari 40% makanan utama Polymesoda erosa adalah plankton yaitu dari Bacillariophyceae Bacillariophyceae dan beberapa dari Filum Protozoa serta ± 36,40% berupa detritus. Sesuai dengan pernyataan Wibowo et al., (2004) dan Nontji (2008) bahwa detritus hasil proses dekomposisi dari jamur dan bakteri menjadi nutrisi yang dimanfaatkan oleh ikan, udang, kepiting, dan kerang sebagai makanan dan sebagian lagi menjadi zat hara (nutrien) terlarut yang dapat dimanfaatkan langsung oleh fitoplankton, alga, ataupun tumbuhan mangrove sendiri pada proses fotosintesis. Keberadaan bahan organik dan plankton berperan sebagai makanan Polymesoda erosa. Dengan demikian ketersediaan makanan merupakan salah satu faktor yang
mempengaruhi mempengaruhi kepadatan Polymesoda erosa. Sesuai dengan pernyataan Dody et al., (2000), Nurdin et al., (2008) bahwa, ketersediaan makanan akan mempengaruhi kepadatan organisme. Polymesoda erosa memperoleh makan dengan cara menghisap air payau
yang mengandung plankton melalui saluran air masuk ( inhalent siphon). Air yang
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secara mekanis (gerakan menggerus oleh crystalline style) dan kimiawi (enzim), hingga fitoplankton berubah menjadi bubur yang halus (Levinton, 1991). Berdasarkan uraian di atas maka timbul permasalahan antara lain: 1) Bagaimana preferensi pakan Polymesoda erosa di kawasan mangrove Segara Anakan, Cilacap? 2) Apakah terdapat perbedaan preferensi pakan pada lokasi yang berbeda di kawasan mangrove Segara Anakan, Cilacap? Tujuan dari penelitian ini dapat dirumuskan sebagai berikut: 1) Mengetahui preferensi pakan alami Polymesoda erosa di kawasan mangrove Segara Anakan, Cilacap. 2) Mengetahui apakah ada perbedaan preferensi pakan alami pada lokasi yang berbeda. Penelitian ini diharapkan bermanfaat untuk mengetahui informasi jenis pakan alami Polymesoda erosa dengan menganalisis pakan alami pada Polymesoda erosa
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II.
MATERI DAN METODE PENELITIAN
A. Materi, Lokasi, dan Waktu Penelitian 1. Materi penelitian
Materi yang digunakan dalam penelitian ini adalah kerang totok P. erosa di kawasan mangrove Segara Anakan Cilacap. Alat yang digunakan dalam penelitian ini adalah GPS ( Global Positioning System), perahu, parang, sekop, rol meter, line transek, kantong plastik, botol film, label, alat tulis, kamera, soil tester , thermometer , salt refraktometer , mikroskop binokuler model Olympus CH-2,
SRC (Sedgwick Rafter Counter ) dengan ukuran panjang 50 mm, lebar 20 mm, dan 3
tinggi 1 mm (volume 1000 mm ), timbangan digital (ketelitian 0,01 gr), nampan, jangka sorong (ketelitian 0,01 mm), pinset, pinset, gunting, pisau pisau dan laptop. 2. Lokasi dan waktu penelitian
Penelitian dilakukan di 2 lokasi, yaitu hutan mangrove Segara Anakan sebagai tempat pengambilan sampel dan Laboratorium Biologi Akuatik Fakultas
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B. Metode Penelitian 1. Teknik pengambilan sampel
Penelitian ini akan menggunakan metode survei. Teknik pengambilan sampel dan penentuan stasiun menggunakan metode acak dengan pertimbangan (Purposive Random Sampling) yaitu dengan melihat kondisi lingkungan mangrove yang diduga terdapat kerang totok. Direncakanan sebanyak 10 stasiun pengambilan sampel, 3 plot mulai dari tepi, 50 m ke tengah, dan 50 m ke dalam dengan 3 kali ulangan.
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masing plot berukuran 3 x 3 m x 10 cm. Tiap plot diletakan secara acak dengan ulangan dilakukan sebanyak 3 kali dan setiap plot diambil seluruh sampel P. erosa. Alasan pengambilan P. erosa dilakukan dengan menggunakan plot berukuran 3 x 3 m x 10 cm dengan pertimbangan P. erosa sudah jarang ditemukan sehingga diharapkan akan mendapatkan
kerang sebanyak mungkin. Pengambilan kerang dengan kedalaman 10 cm dilakukan dengan pertimbangan kerang tersebut hidup pada dasar perairan sampai kedalaman 10 cm. Faktor lingkungan yang diukur meliputi suhu udara, suhu air, pH substrat, serta salinitas. 3.2. Pengukuran sampel Polymesoda erosa erosa
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Gambar 4. Skematis pengukuran panjang, lebar dan tebal dimensi cangkang Polymesoda erosa erosa
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4.4. Pengukuran parameter pendukung a. Suhu
Pengukuran suhu udara dan air dilakukan di sekitar titik sampling. Pengukuran suhu udara dilakukan dengan menggantungkan termometer selama 10 menit di udara setelah itu dicatat. Pengukuran suhu air dilakukan dengan cara mencelupkan mencelupkan termometer ke dalam badan air pada saat pasang selama beberapa waktu sampai diperoleh angka yang konstan, kemudian diangkat dan segera dicatat suhunya (Effendi, 2003). b. pH tanah
Pengukuran pH tanah dilakukan dengan menggunakan soil tester.
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C. Metode Analisis
Pada penelitian ini, komposisi pakan alami akan digunakan analisis deskriptif dengan Indeks of Preponderance (Ii) yaitu analisis data yang digunakan untuk menganalisis tingkat kepenuhan komposisi pakan alami dalam lambung P. erosa. Menurut Effendi (2002), IP dihitung dengan rumus:
∑
Prepond erence) = Indeks utama ( Indeks of Preponderence
= persentase numerical satu macam makanan
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III.
JADWAL PENELITIAN
Penelitian tentang Preferensi Pakan Alami Kerang Totok ( Polymesoda erosa) di Laguna Segara Anakan Cilacap dilakukan selama lima bulan seperti yang disajikan
pada tabel 3.1 : Tabel 3.1. Jadwal penelitian
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DAFTAR REFERENSI
Ali, M, S. 2007. Kondisi Kerang Geloina Pasca Tsunami di Perairan Ekosistem Mangrove Pesisir Barat Kabupaten Aceh Besar. Prosiding Seminar Nasional Moluska dalam Penelitian, Konservasi dan Ekonomi : 109-120. Anwar, K. 2009. Ekobiologi dan Pola Distribusi Ukuran Kerang Kepah ( Polymesoda erosa) di Perairan Pantai Peniti Kabupaten Pontianak Kalimantan Barat. Tesis. Magister Manajemen Sumber Daya Pantai. Universitas Diponegoro. Semarang.
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Freeport. 2007. Kajian Dampak Tailing PT. Freeport Terhadap Perairan Muara Ajkwa dan Sekitarnya. PT. Ecostar Engineering. 500. Froneman, P.W. 2004. Zooplankton Community Stucture and Biomass in A Southern African Temporarily Open/Close Estuary. Estua Coast and Sshelf Scienc. 125-132. Gimin, R., R. Mohan, L.V. Thinh and A.D. Griffiths. 2004. The Relationship of Shell Dimensions and Shell Volume to Live Weight and Soft Tissue.Aricles.NAGA, Tissue.Aricles.NAGA, WorldFish Center Quarterly 3 & 4.
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Nurdin, J., Hendri, A. Asmara dan R. Deswandi. 2004. Kepadatan dan Indeks Makanan Terbesar Kerang Kima ( Tridacna maxima) di Perairan Pulau Pasumpahan Pasumpahan Kota Padang Sumatera Barat. Sains Indonesia. 1-7. __________., J. Supriatna., M.P. Patria., A. Budiman. 2008. Kkepadatan dan Keanekaragaman Kerang Intertidal (Mollusca: Bivalve) di Perairan Pantai Sumatera Barat. Prosiding Seminar Nasional Sains dan Teknologi. Universitas Lampung. 505-520. Paul, B. 2001. The Bivalvia. California Academy of Sciens, 45.
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Yuwono, E., T.C. Jennerjahn, I. Nordhaus., E.R. Ardli., M.H. Sastranegara and R. Pribadi. 2007. Ecological Status of Segara Anakan, Indonesia: A Mangrovefringed Lagoon Affected by Human Activities. Asian Journal of Water, Environment and Pollution. 4: 61-70.
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Lampiran 1. Analisis jenis dan tekstur tanah t anah menurut Sulaiman et al., (2005) dengan
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pinggan alumunium yang telah diketahui bobotnya dengan air bebas ion
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