Struktur Tingkat Trofik Komunitas Ikan Di Waduk Wadaslintang Kabupaten Wonosobo, Jawa Tengah

Abstract

ABSTRAKWaduk Wadaslintang memiliki potensi perikanan yang cukup besar baik perikanan tangkap maupun perikanan budidaya. Kegiatan penangkapan ikan di waduk Wadaslintang saat ini sudah cukup tinggi, yang akan berdampak langsung pada struktur komunitas ikan yang menyebabkan pergeseran pola hubungan antara pemangsa, mangsa atau pesaing pada berbagai tingkat trofik. Tujuan penelitian ini untuk mengetahui pola hubungan antar kelompok ikan berdasarkan tingkat trofik dari tingkat trofik terendah sampai kepada ikan karnivor, sehingga diperoleh gambaran peran kelompok ikan dalam komunitas. Penelitian ini dilaksanakan pada bulan April, Juni, September dan Nopember 2013 di perairan waduk Wadaslintang. Analisa data mencakup komposisi hasil tangkapan dan kebiasaan makan ikan serta tingkat trofik komunitas ikan. Analisis sidik ragam untuk mengetahui perbedaan antar tingkat trofik. Ikan contoh diperoleh dari nelayan dengan alat tangkap jaring, mulai dari ukuran 0,75 -4,5 inchi. Hasil penelitian diketemukan sebanyak 15 jenis ikan yang didominasi oleh ikan nila dengan persentase berat mencapai 56,45%. Struktur komunitas ikan di perairan waduk Wadaslintang tersusun atas tiga kelompok tingkat trofik yaitu ikan patin, nila, tawes dan melem mempunyai jenjang trofik terendah (<2,5), ikan bader dan brek mempunyai nilai jenjang trofik sedang (2,5 -3,49) dan ikan beong, betutu, palung dan lele mempunyai nilai jenjang trofik tertinggi (>3,5). Kelompok ikan pada tingkat trofik rendah < 2,5 sangat penting dalam menyokong komunitas ikan di perairan waduk Wadaslintang karena akan mempengaruhi kelompok ikan dengan tingkat trofik tinggi. KATA KUNCI: Komposisi ikan, makanan ikan, tingkat trofik,waduk Wadaslintang ABSTRACT Wadaslintang reservoirs was considered have high potential for fisheries and aquaculture. Fishing Activities in the Wadaslintang reservoir is currently quite high, which may gave a direct impact on the trophic levels structure of fish community and would change composition of predators, preys, and competitors on various trophik levels. The objective of research was focused on the pattern of relationship among trophic groups from the lowest level of trophic to the highest level of carnivorous fish

Food Preference of Bullet Tuna (<i>Auxis rochei</i> Risso, 1810) in Prigi Coast of Trenggalek Regency, East Java

“…The trophic level estimated of bullet tuna in Prigi Coast is 3.7, positioning it as a carnivore that opportunistically eats various food types and preferred ate fish and cructacean. Fatah and Adjie (2015) state that fish catching is capable of altering the spatial distribution and fish abundance, which will affect species interaction and trophic structure in general. The trophic level of a particular fish can be affected by life expectancy (size), gonads, ecomorphology, behavior, intraspecies and interspecies competition, as well as distribution of resources and parasites (Elliot & Hemingway 2002).…”

Induction of oocyte developer hormones (oodev) on the maturity of Poropuntius tawarensis

“…It was showed in this study, the high GSI were found in treatment B and C with the stage III, IV and V. In this study, the GSI value obtained was less than 20%. Therefore, its indicated that P. tawarensis are included in the group of fish with low GSI values and can be categorized as fish that can spawn more than once per year, according to Fatah et al [22], the GSI value ≤ 20% is a group of fish that can spawn more than once a year. The use of Oodev hormone on treatment B and C was able to ripen brood fish of P. tawarensis.…”