This is the first report on the use of live cockroaches as feed for farmed arowanas. Firstly, the nymphal development period, reproductive potential, longevity and nutrient profiles of the various development stages of the lobster cockroach, Nauphoeta cinerea, were determined. The fecundity of each female cockroach averaged 82.9 nymphs. An increase in body crude protein and lipid levels was observed as nymphs metamorphosised into later instars. The nutrient content of the adult stage was different from the nymphal stages with distinct differences evident between sexes. Secondly, in the feeding trial of pearl arowana, Scleropages jardini, three groups of live cockroaches were used; adult males with low lipid and high protein levels (3% and 30.1%, respectively; A-LLHP, control group), adult males with mid-level lipid and high protein levels (6.1% and 29.7%, respectively; A-MLHP) and late nymphs with high lipid and lower protein levels (10.3% and 22.9%, respectively; N-HLLP). Each group of cockroaches was fed to eight replicate individually-housed fish once daily for 12 weeks. A-LLHP and N-HLLP cockroaches were fed a commercial rat feed, whereas A-MLHP cockroaches were fed a specially formulated feed with added astaxanthin (80Â mg/kg) to produce nutrient-enriched cockroaches. Arowana growth was highest in the N-HLLP-fed group followed by A-MLHP and A-LLHP (
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| å ¨é¨æé´ | è¿å»ä¸å¹´ | è¿å»30天 | |
|---|---|---|---|
| æè¦æµè§æ¬¡æ° | 714 | 240 | 28 |
| å ¨ææµè§æ¬¡æ° | 24 | 13 | 1 |
| PDFä¸è½½æ¬¡æ° | 41 | 22 | 3 |
This is the first report on the use of live cockroaches as feed for farmed arowanas. Firstly, the nymphal development period, reproductive potential, longevity and nutrient profiles of the various development stages of the lobster cockroach, Nauphoeta cinerea, were determined. The fecundity of each female cockroach averaged 82.9 nymphs. An increase in body crude protein and lipid levels was observed as nymphs metamorphosised into later instars. The nutrient content of the adult stage was different from the nymphal stages with distinct differences evident between sexes. Secondly, in the feeding trial of pearl arowana, Scleropages jardini, three groups of live cockroaches were used; adult males with low lipid and high protein levels (3% and 30.1%, respectively; A-LLHP, control group), adult males with mid-level lipid and high protein levels (6.1% and 29.7%, respectively; A-MLHP) and late nymphs with high lipid and lower protein levels (10.3% and 22.9%, respectively; N-HLLP). Each group of cockroaches was fed to eight replicate individually-housed fish once daily for 12 weeks. A-LLHP and N-HLLP cockroaches were fed a commercial rat feed, whereas A-MLHP cockroaches were fed a specially formulated feed with added astaxanthin (80Â mg/kg) to produce nutrient-enriched cockroaches. Arowana growth was highest in the N-HLLP-fed group followed by A-MLHP and A-LLHP (
| å ¨é¨æé´ | è¿å»ä¸å¹´ | è¿å»30天 | |
|---|---|---|---|
| æè¦æµè§æ¬¡æ° | 714 | 240 | 28 |
| å ¨ææµè§æ¬¡æ° | 24 | 13 | 1 |
| PDFä¸è½½æ¬¡æ° | 41 | 22 | 3 |