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Aquaculture production is often accompanied by some stressors which undesirable effects on growth and physiological function. Music is one of the cases that could eliminate or reduce the effects of stressors. The purpose of this study was to determine the effect of Iranian traditional music on growth, reproduction and behaviour of zebra cichlid (Pseudotropheus zebra). Fish with an average weight 5.5  0.18 g were put under both music and silence treatment with the number of 2 fish/aquarium with 3 replicates for 4 weeks. Fish under music treatment were put twice a day and every 30 minutes under the Iranian traditional music. At the end of this period, suitable conditions for fish were created to spawning. The results showed no significant differences in growth parameters, but 50 percent of fish during the 2-week were spawned in music treatment. However, only 16.6 percent of fish under silent treatment were spawned. Of eggs and spawn time, significant differences were observed between two groups. When is music being played, the fish were found mainly along approach the speakers, while the distribution of fish treated silence was uniform. The results of present study showed that use of music can affect physiological function of fish, which have more tranquility and less stress on fish.

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The huge attention toward dried food in ornamental fish culture is caused by the difficulty related to live-food preparation. This study investigated the effects replacement of live feed by commercial feed TetraMin on growth, survival rate and resistance to environmental stress in Oscar fish (Astronotus ocellatus) larvae. The experimental setup was completely randomized design comprised of five treatments including, namely T1 (Forty days Artemia nauplii), T2 (Thirty days Artemia ten days of commercial food), T3 (Twenty days Artemia twenty days of commercial food), T4 (Ten days Artemia thirty days of commercial food) and T5 (Forty days commercial feed). All treatments were performed in triplicate. In this study, fish larvae were fed 4 times a day and to apparent satiation, commercial feed and live feed. After a 40-day feeding experimental period, all the larvae each aquarium were sampled for and growth determination. Fish larvae in T1, T2, and T3 treatments showed the highest total length, weight and survival rate. Lowest total length, weight and survival rate were recorded in T5 treatment (p<0.05). Also, against challenge tests in T1, T2 and T3 treatments was significantly in comparison with T5 (p<0.05). The results of the present study demonstrate that the Oscar fish larvae could consume commercial feed starting from the 20 without any difference in growth with live food.

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The present study was conducted in Electric Blue Cichlid Sciaenochromis fryeri in early larval developmental stages from the fifth day post hatching (DPH) until 51 DPH to determine day of transforming from embryo to juvenile. Morphological characteristics were evaluated by using ImageJ software. Allometric growth patterns were calculated based on the formula Y=aX^b. Yolk sac depletion was occurred on day 9. Scales were developed on day 19 and finaly developed juvenile shape. allometric pattern of different body segments were calculated according to isometry, positive, and negative allometry. Positive allometry of head and tail prior to inflexion point and variation in allometric growth pattern in different body segment determine priorities of organogenesis for survival in fish early life history. The obtained results showed consistency between the larval morphological changes and development of organs related to sensory movements and larval behavior. Every morphological change in larvae displays the development and evolution of one of the organs involved in feeding, breathing, swimming and sensory organs.