Empirical feed formulations for the marine ornamental fish, striped damsel, Dascyllus aruanus (Linné 1758) and their physical, chemical and nutritional evaluation

Abstract Formulated feeds containing a common ingredient mixture (CIM) consisting of ¢shmeal (anchovies), shrimp meal (Acetes), squid meal (Loligo) and soybean meal incorporated in ascending levels to obtain protein levels ranging from 180 to 560 g kg . This is the ¢rst report on the development of formulated feeds for damsel¢sh that would help in rearing and aquarium keeping of damsel¢sh worldwide

Not Available

Not AvailableKuruma shrimp Penaeus (Marsupenaeus) japonicus is a high-value penaeid shrimp in Japanese live fish markets owing to its characteristic colour and flavour. Although this species was believed to be the single species of subgenus Marsupenaeus, the exist-ence of two morphotypes (Form I and Form II) have been confirmed recently. Recent studies classified the native stock from Indian coast as Form II. Four different experi-ments were carried out to study the reproductive performance, larval survival, salinity tolerance and growout performance of P. japonicus Form II. The reproductive per-formance experiment was conducted using two treatment groups comprising female shrimp differentiated by the maturity stages (T1–Early maturing and T2–Immature). Female shrimp were unilaterally eyestalk ablated to accelerate the reproductive maturation. Although no significant differences (p > 0.05) were found in fecundity, spawning frequency, number of nauplii and hatching percentage between the treat-ments, early maturing shrimp had significantly lower (p 0.05) mean body weight (BW) and survival (1.31–1.39 g, 63.3%) compared to shrimp reared at 25 g/L (1.46 g, 79.9%) at the end of 60 days. The 167 days farming trial at stocking density of 50 PL/m2 resulted in productivity of 0.55 kg/m2, with a mean BW of 20.48 ± 0.68 g and 55% survival. Low salinity produc-tion performance observed in this study indicates that the native P. japonicus Form II may be physiologically distinct from the other forms/stock elsewhere. The study also concludes the suitability of the species for brackishwater aquacultureNot Availabl