Effects of added artificial substrate on the growth and survival of juvenile Indian white prawn (Penaeus indicus)

The effects of added artificial substrates on juveniles of Indian white prawn (Penaus indicus) were evaluated. Three replicate tanks were randomly assigned to receive added substrate to increase available surface 20, 40, 60 and 80 percent. Control tanks received no added substrate. Juveniles with mean weight of 0.42±0.027gwere raised for 90 days in 5000 lit concrete tanks filled with 4000 lit of water and stocked at a density of 30 ind/m2. Growth and survival of P. indicus juveniles were studied during the culture period. Results showed that substrates significantly (P0.05)

Feeding and spawning characters of Barbus grypus Heckel, 1843 in Khouzestan water bodies

The result from conducted surveys on Shirbot (B. grypus) in Khuozestan water bodies showed that this fish has a wide occurence in almost all water bodies, and in a wide range of temperature and salinity. It is revealed that it can grow up to 20 kg in weight. Due to its tasty flesh, there is a good demand for it, especially for local markets. Diet characteristics and food intakes indicate its omnivorous habit. Data indicate that its presence in Khouzestan plain, seems to be mainly for feeding purpose. Its reproductive activities, occur in the northern parts of the regions characterized with sandy or gravel substrate high water current, low temperature and high oxygen content. This condition is not available in Khouzestan plain

Effect of LHRHA2 and carp pituitary extract hormone on some spermatozoa fertility and quality indices in Barbus sharpeyi

Effects of LHRHA2 hormone in 2.5, 5 and 10µg/kg doses and anti-dopamine metoclopramide on Barbus sharpeyi spermiation, spermatozoa quality and fertility indices, chemical (Na+ , K+ and Ca+2) and biochemical component (Alkaline phosphates, Glucose and Triglyceride) of seminal plasma and its osmotic pressure were assessed in comparison to Carp pituitary extract treatment. Results indicated that the highest incubation survival, hatching rate, sperm volume, duration of sperm motility as well as the lowest larval deformity were achieved by injection of LHRHA2 (10µg/kg +2.5mg/kg metoclopramide) and it was significantly different to others groups. Application of above mentioned treatment had the highest osmotic pressure with about (Mean ±SD) 324±7.31mOsmol kg-1 among other groups. Also, the highest level of Na+ was assessed by injection of LHRHA2 (10µg/kg +2.5mg/kg metoclopramide). Result showed that injection of Carp pituitary extract caused the highest spermatocrit, K+ value and larval deformity in comparison to other treatments. In conclusion, optimum sperm quality can be produced by injection of LHRHA2 (10µg/kg + 2.5mg/kg metoclopramide) in males of B. sharpeyi at 8 hour following hormonal stimulation. Also, above mentioned treatment caused increasing of incubation survival and decrease of larval deformity in B. sharpeyi

Study of spawning season and spawning ground of soboor (Tenualosa ilisha, Ham. Bunch., 1822) during its migration in Khuzestan rivers

During 12 months of sampling, from 17 stations, 327 specimens of Soboor fish Tenualosa ilisha, including 120 females, 113 males and 86 immature were caught. Total length (TL) of the fishes was 120-500mm. Maximum diameters of soboor ova 0.795mm and the ova with diameter more than 0.7 mm released at one spawning round. Temporal and spatial distribution of ova diameter corresponding to GSI changes showed that ova with diameters between 0.64 to 0.795 mm released spontaneously in many rounds along fish migration route during its spawning season. The results indicate that the spawning of soboor begins upon its entering to Bahmanshir and Arvand Rivers on April and continued up to Shushtar and Dezful cities on September where their migration route and season are ended

Culture of Indian white prawn (Penaeus indicus) brooders from adolescent shrimps using natural diet in the captivity

The shrimp farming success in the future will greatly depend upon increasing supplies of healthy and high quality seed for stocking ponds. The limited and inconsistent availability of wild shrimp postlarvae together with an urgent need of establishing selective breeding programs, increased the interest in captive broods of penaeids. Many investigations have been carried out on several shrimp species world-wide. This study has been conducted on 3 shrimp groups since September to July 1999 in Bandar-e-Imam southwest Iran. The wild group (SPB) prepared from Jask area and the pond group (POB) prepared from artificial ponds upon harvesting them as marketable size have been investigated. 2 groups were exposed to natural diets consisting of squid and artemia biomass in same conditions using 12 m33 concrete tanks. Stocking density was 2 piece/m2 (1F:1M). Half part of the pond bottom covered by fine sand to reduce the stress where the other part has been used for feeding. Daily ration given in 3 times by satiation method. Also reproductive performance of wild gravid brooders (WLB) was recorded as a control group. 2 examined groups well and around 30% of POB females successfully ripened a produced eggs and nauplii. Almost all males of both groups were matured. Data showed fecundity is highly correlated to the TL and W of the brooders by positive trend. Considering the TL, W, fecundity and nauplii production the WLB brooders are significantly (P<0.05) higher than 2 other groups, while the SPM brooders are significantly (P<0.05) higher in hatchability. Meanwhile the survival rate from nauplii to postlarvae stage was around 30% for SMP brooders. On the other hand the growth parameters (TL,W) of the marketable size of the shrimps produced from SMP brooders were significantly (P<0/05) higher than those produced from WLB group. Since the fecundity is important by increasing the brood size thus the data suggest the superiority of the SPM brooders

In vitro effects of salinity and algae genera on the Rotifer (Brachionus plicatilis Muller 1786)

The marine rotifer Brachionus plicatilis is extensively used as a major live food in fish larvae culture all over the world. In the present study an attempt was made to find out the optimum salinity and feeding conditions for growth of the rotifer B. plicatilis. The rotifer was cultured using Batch culture method at four salinities ranges (20, 25, 30 and 35ppt) and was fed with 3 species of microalgae including, Nannochloropsis oculata, Isochrysis galbana and Chlorella sp. The difference between salinity was not significant (P>0.05) but there was a significant difference between the food types (P<0.05). In all of the experiments, the combined effect of salinity and algal type on rotifer growth were significant (P<0.05). The best result was observed in the experiment conducted at 35ppt salinity using N. oculata as the main food (378 ind/ml)

Lysine and methionine supplementation in high soy protein content diets for silvery-black porgy (Sparidentex hasta) juveniles

A two-month feeding trial was conducted to evaluate the effect of partial replacement of fish meal (FM) by soybean protein (SP) alone or in combination with lysine (Lys) and methionine (Met) supplementation in practical diets for silvery-black porgy juveniles (16.7±0.1 g). Seven isoproteic (ca. 50% crude protein) and isoenergetic (ca. 22.4 MJ kg-1) diets were formulated in which 45% (SP45), 60% (SP60) and 75% (SP75) of FM protein were replaced by SP and the control diet (FM) was prepared with FM as the major source of protein. In SP45+, SP60+ and SP75+ diets, 45 to 75% of FM was replaced by SP with supplementing blends of Lys and Met. Growth performance, feed utilization, and protein and lipid digestibility decreased with increasing dietary SP levels (p<0.05). Fish fed SP75 had the highest whole body lipid content, but with the lowest whole body arginine, lysine, histidine, phenylalanine and taurine concentrations (p<0.05). Supplementing Lys and Met in SP based diets did not improve growth performance, suggesting that the anti-nutritional factors in soybean protein products rather than Met and Lys deficiency might limit FM substitution with SP in silvery-black porgy juveniles.info:eu-repo/semantics/publishedVersio

Effects of soy protein base diet supplemented with lysine and methionine on digestive enzymes activity and hematological parameters in silvery-black porgy (Sparidentex hasta) juveniles

The effect of dietary partial replacement of fish meal (FM) by soybean protein (SP) alone or in combination with lysine (Lys) and methionine (Met) supplementation were tested in a 60-days feeding trial for silvery-black porgy (Sparidentex hasta) juveniles. Seven isoproteic (ca. 50% crude protein) and isoenergetic (ca. 22.4 MJ/kg) diets were formulated in which 45% (SP45), 60% (SP60) and 75% (SP75) of FM protein were replaced by SP and the control diet (FM) was prepared with FM as the major source of protein. In SP45+, SP60+ and SP75+ diets, 45 to 75% of FM was replaced by SP with supplementing blends of Lys and Met (98% of purity). The activities of the trypsin, lipase and α-amylase were higher in fish fed SP diets with crystalline amino acids supplementation than in the other groups (P < 0.05). Fish fed SP75 and SP75+ diets had the lowest red blood cell count and hematocrit level (P < 0.05). The results of the current study indicated that anti-nutritional factors in a soy-protein based diet rather than lysine and methionine deficiencies may have adverse effects on digestive enzymes activities and health condition in silvery-black porgy juveniles.info:eu-repo/semantics/publishedVersio

Length frequency, length -weight relationship and gonad development status of silver pomfret, Pampus argenteus, in Khouzestan (Iran) and Kuwait coastal waters, Persian Gulf

Data used in this publication is a part of a comprehensive study was carried out jointly between South Aquaculture Research Center (SIARC) and Kuwait Institute for Scientific Research (KISR) on silver pomfret (Pampus argenteus) in 2003 to 2005. The study was aimed to collect efficient data from two regions from biological and population parameters of this economically important fish to properly explain its stock situation and ultimately leads to improve a better management program for conservation of stock and yield sustainability. Monthly data collection on length and biology, started since May 2003 and ended by December 2005. Shrimp trawl and gill nets were used for sample collection from the predicted areas in both sea regions. FL of the fish was within the range of 12-34cm, with the dominant length of 18-25cm in Kuwaiti waters. In Khouzestan waters fork length was ranged 14-22cm for the years of 2003 and 2004 but 14-26cm for 2005. Strong relationship between length and weight in both countries with a scanty difference was observed for this species (R2 =0.989 for Khouzestn, R^2=0.947 for Kuwait). The findings of present study are suggesting that silver pomfret is following an allometric growth pattern in studied area. Spawning of silver pomfert begin in July and continue till October in Kuwaiti waters but in Khouzestan waters the heights spawning of this fish started in end of May till October. Length at first maturity of this species in the studied area of Kuwait was found to be 19.6cm FL based on Spearman-Karber method but 23.3cm (FL) based on the logistic model. The parameter was estimated 20.0 cm (FL) in Khouzestan waters according to the logistic model

Effects of varying levels of dietary protein and energy on the growth, food performance and body composition of Sobeity (Sparidentex hasta) juvenile

This study was carried out to evaluate the effect of varying dietary levels of protein (45%, 50%, 55% and 60%) and energy (20, 22 and 24 kjg^-1) on the growth, survival rate, food performance and body chemical composition of sobaity Juvenile. 36, 300 Lit polyethylene containers equipped with a flow-through water system (with 1 Lit/min water exchange) were provided and each stocked with 18 Juvenile fish (27.99 ± 0.14 g weight). During the rearing period, a biometric measurement was carried out once fortnightly. After a 56-day rearing period, results showed the significant effect of the treatments (the interaction between protein and energy) and the varying levels of protein and energy on the growth and food performance, survival rate and body composition) P≤0.05) of the fish, but the effect of the dietary protein was not significant on the FCR, PER, fat and body crude fiber (P>0.05). Also, the effect of dietary energy was not significantly effective (P> 0.05) on the growth and food performances, but was significantly effective on the survival rate and body composition) P≤0.05) of the fish. Results also showed the highest amount of growth of the fish in the diet with 60% CP and 24 kJg^-1 energy, the highest survival rate in the diet with 55% CP and 22kJg^-1 energy and the best FCR and PER in the diet with 50% CP and 24 kJg^-1 energy. According to the results of the present study, 50% CP and 22 kJg^-1 energy are recommendable to cover the dietary protein and energy requirements of sobaity fish in the Juvenile stage