Model Penebaran Ikan Nila Di Waduk Malahayu, Brebes, Jawa Tengah

Abstract

Waduk Malahayu merupakan salah satu waduk yang dimanfaatkan untuk perikanan. Kegiatan penangkapan di waduk ini telah lama dilakukan baik oleh nelayan sekitar maupun luar daerah. Saat ini telah terjadi indikasi adanya penurunan produksi sebagai akibat adanya degradasi sumber daya ikan dan lingkungan serta intensitas penangkapan yang tinggi. Diperlukan upaya pengelolaan untuk meningkatkan produksi ikan di Waduk Malahayu. Salah satu upaya tersebut adalah dengan melakukan penebaran ikan secara rutin baik oleh instansi pemerintah maupun nelayan setempat. Salah satu faktor keberhasilan penebaran ikan terhadap peningkatan produksi adalah jumlah padat tebar yang memadai. Akan tetapi, kajian mengenai jumlah padat tebar yang memadai melalui pendekatan model matematis belum banyak dilakukan. Model matematis mampu memperhitungkan aspek lain seperti penebaran kembali dan penangkapan ke dalam satu kajian model holistik dan analitik. Penelitian ini bertujuan untuk mengestimasi jumlah benih nila yang sebaiknya ditebar. Kondisi populasi ikan nila digambarkan dengan skenario laju pertumbuhan logistik, dengan pertimbangan adanya penebaran dan penangkapan. Hasil menunjukkan bahwa jumlah benih nila untuk ditebar sehingga dapat meningkatkan produksi adalah sekitar 8 ton/tahun atau setara dengan 533.333 ekor/tahun. Hasil dari kajian ini diharapkan bermanfaat bagi pengelolaan sumber daya ikan di Waduk Malahayu melalui pemulihan sumber daya. Fish stocking has been done as an effort to increase fish stock in Malahayu Reservoir. The need to fish stocking is due to the degradation of environment, fish resources and high exploitation either, lead to the decreasing of fish production on those reservoir. Fish stocking that intensively done by local government and community does not yet give an impact to the increasing of fish production. The amount of stocked seeds by using mathematical model approach has not done yet. Mathematical model approach is able to consider other aspects such as restocking activities and fishing into a holistic and analytical study. The current research aimed to estimate the amount of seed of Tilapia that properly stocked in Malahayu Reservoir. Population condition of Tilapia is described by logistic growth rate scenario, taking into account of stocking and fishing. In effort to increase the production, the amount of Tilapia should be stocked about 8 tonnes/year or 533.333 individuals/year. The results obtained in this research are expected to be beneficial for the management of fish resources in Malahayu Reservoir through stock enhancement.

Yellowstripe scad fishery (Selaroides leptolepis) in FMA 712: a short review

“…However, the composition experienced a shift in 2002-2007, dominated by the scads (Decapterus russelli and Decapterus macrosoma) as much as 52% [6]. This composition was also found in the same waters, including the scads (22%), Goldstripe sardinella (21%), mackerel (16%), Indian mackerel (14%), Indian oil sardine (11%), and large pelagic fish (7 %) [16]. This shift in composition can also occur due to the different fishing seasons for small pelagic fish in the Java Sea, both east and west monsoons [17].…”

“…However, a resource assessment still needs to be done as a basis for management because the increase in fishing pressure affects the change structure population and the level of exploitation which can also disrupt the condition of resource stocks in the waters [13,14]. Many studies on the management of purse seine fishing activities in the Java Sea (FMA 712) have been operated, but they do not specifically discuss the yellowstripe scad (Selaroides leptolepis) and its exploitation rate [1,6,[15][16][17]. Therefore, this study analyzes the MPS fishery's condition and the yellowstripe scad's exploitation in the waters of FMA 712, which can be used as a basis for making management policies.…”

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“…Jenis ikan yang paling umum direstocking adalah nila, karena mudah berkembang biak, memiliki pertumbuhan cepat dan tingkat toleransi yang tinggi terhadap lingkungan (Triharyuni et al, 2019). Ramadhani et al (2016) Suyono (2010), pH baku untuk kegiatan perikanan adalah 6-8,5.…”

The exponential smoothing model for squid production in Muara Angke Fishing Port, Jakarta

“…The large portion of squid production was because many purse seine, trap and gill net fishermen replaced fishing gear with bouke ami, while bouke ami is a fishing tool for squid [5]. Besides that, the squid fishing season is relatively longer than fish whose migration is active [6,7], so fishermen at Muara Angke Fishing Port can continue fishing.…”