Abalone is a herbivore marine animal which feeds on seaweed. Abalone culture has a good prospect in terms of price, market share and simple culture technique. Thus, a study was conducted with the aim of finding out an effective and efficient abalone culture technique in terms of feed use and density. In this study, a 42 cm diameter plastic container with a 22 cm height was used. Three vertically arranged containers were used as the experimental group which were put into a net box and hung onto a raft so that the containers were placed in a 4 m depth below the sea surface. The juvenile of abalones being used came from a hatchery production that has been adapted to cages environment with Gracilaria sp. and Ulva sp. feed. The initial density of abalones was 450 for each container, with the initial weight of 2.6-3.2 g and the 2.5-2.7 cm shell lengths. The abalones were fed with Gracilaria sp. and Ulva sp. seaweeds with different Gracilaria sp./Ulva sp. proportions, i.e. 100/0% (A); 80/20% (B); and 60/40% (C) as the treatments. Each treatment consisted of two replications. After three months of rearing period, densities of abalones were reduced to be 190 for each experimental unit. Weight and shell length of abalones were measured every month by measuring 25 abalone samples from each experimental unit. The result of the experiment showed that the increase in the Ulva sp. proportion in the feed increased the growth of abalones and decreased the feed conversion. Feeding with Gracilaria sp./Ulva sp. proportion of 60%/40% allowed the best growth of abalones. The decrease of abalone density in the experimental unit after three months of rearing also produced an increase in their growth.
<p>Analisis keragaan pertumbuhan benih ikan kerapu terdiri atas panjang, bobot, laju dan koefisien pertumbuhan, sintasan, dan faktor kondisi; merupakan aspek biologi yang penting diketahui dari kandidat ikan budidaya. Penelitian ini bertujuan untuk mengetahui hubungan panjang bobot, pertumbuhan, sintasan, konversi pakan, serta faktor kondisi benih ikan kerapu hibrida hasil hibridisasi kerapu macan (<em>Epinephelus fuscoguttatus</em>) dengan kerapu kertang dan kerapu batik (<em>Epinephelus microdon</em>). Benih hibrida yang digunakan terdiri atas kerapu hibrida cantang (kerapu macan x kerapu kertang ), kerapu hibrida cantik (kerapu macan x kerapu batik ), serta kerapu macan (kerapu macan x kerapu macan ) sebagai kontrol. Dengan ukuran panjang dan bobot awal masing-masing antara 10-12 cm dan 22-35 g/ekor. Benih dipelihara dalam sembilan buah jaring ukuran 2 m x 2 m x 2 m di keramba jaring apung (KJA) dengan padat penebaran benih uji sebanyak 250 ekor/jaring. Hasil akhir penelitian menunjukkan bahwa terdapat korelasi positif antara panjang dengan bobot pada kerapu hibrida cantang, cantik maupun kerapu macan dengan nilai koefisien korelasi masing-masing adalah 0,933; 0,884; dan 0,787. Pertumbuhan dari ketiga benih ikan kerapu bersifat allometri negatif, dengan nilai b 2,533; 2,896; dan 2,546. Pada kerapu hibrida cantang, laju pertumbuhan dan koefisien pertumbuhannya lebih besar dibandingkan dengan benih kerapu yang lainnya. Hasil perkawinan silang juga berpengaruh sangat nyata terhadap konversi pakan, serta sintasan ikan yang dihasilkan. Faktor kondisi ikan kerapu hibrida cantang adalah 2,80; sedangkan pada kerapu hibrid cantik dan kerapu macan masing-masing adalah 2,12 dan 2,10.</p>
Vitamin E adalah salah satu jenis vitamin yang digunakan untuk mempercepat pematangan gonad ikan. Penelitian ini bertujuan untuk mengetahui dosis implantasi vitamin E yang efektif dalam memacu pematangan gonad induk bandeng.
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