Study on banana prawn (Fenneropenaeus merguiensis) movement in the Hormozgan waters in the northern Persian Gulf

This research was carried out in Strait of Hormuz in 2020. The present study aimed to investigate the migration and growth pattern of tagged shrimps in the study area. Bloodstock shrimps were reared in June (2010). About 50000 juvenile shrimps were tagged by red color florescent elastomeric tag and released in the estuaries of Tiab, Kolahi and Koolgan at night in July 2010. Local people were informed through posters describing the tagging program, as well as articles published in a local magazine. A tagging program film was broadcasted on local television three times prior to the shrimp fishing season and during shrimp catch period. In the catch season, September and November months, 11 tagged prawns (0.022%) were recaptured. Movement direction of tagged prawns was northwesterly of deeper waters of releasing areas. Speed was recorded at 0.33-0.33 km/day and tagged prawns were recaptured 46 km from the released locations. The mean (±SD) weight of released banana prawns and the average weight of the recaptured prawns were1.2±0.2 g and 22.06±4.9 g, respectively. The growth rate of recaptured prawns was 16-26 g and growth speed was 0.88-1.41 g per week. In the study area, the major sea current was from the Oman Sea to the Persian Gulf through Strait of Hormuz probably influencing the pattern of banana prawn movement in Hormozgan area

Probiotic effects of Bacillus spp. bacteria on the survival and growth of white shrimp (Litopenaeus vannamei) in 30 and 40 g/lit salinities

The probiotic effects of Bacillus spp. bacteria on the growth and survival rate of Litopenaeus vannamei in 30 and 40 g, salinities was investigated. We conducted the experiment in Bandargah Research Station, Bushehr province during 45 days. Four treatments with three replicates, and two controls were used and probiotic powder, dissolved in water along with the growth stage pellet was applied in 3O ppt and 4O ppt salinities. The control treatments were only fed by the growth stage pellet in 3O ppt and 4O ppt salinities. The results revealed that growth and survival rate of treatment groups in 3O ppt salinity exposed to the probiotic powder were higher than those of the controls without increasing probiotic powder (P0.05). Survival rate of the treatment groups in 4O ppt salinity was significantly higher than those of the control (P<0.05). Also, the results indicated that growth and survival factors of the treatment groups in 3O ppt salinity in comparison with those of the control in 4O ppt salinity were significantly higher. We conclude that addition of Bacillus spp. bacteria to 3O ppt salinity together with application of growth stage pellets to white shrimp, Litopenaeus vannaiiiei, could be very useful in comparison with 4O ppt salinity. The results of this study were obtained through ANOVA and LSD tests

The growth of faunal aquatics on artificial reefs in Bandar Lengeh Area, Persian Gulf

The growth of organisms on seven different artificial reef structures was surveyed from 2004-2006 in Hormuzgan offshore waters (Bandar Lengeh area). The organisms consisted of 12 groups the main of which included Barnacle (Megabalanus tintinnabulum), Sponges with five families and Tunicates. The highest density was observed in 2005, amounting to some 409.224g wet weight on each structure. However, a decrease was observed afterwards in the total mass of aquatics living on the structures. Some organisms such as crabs, polychaets, bivalves and fish larvae showed an increasing in size in the first year. Bivalves showed a decreasing trend in density but otherwise an increasing trend in size over time. Artificial shape of the reefs was not effective on the total density of the organisms living on the structures. Total density of live organisms on different parts of the artificial reefs (surface, middle and bottom) was not statistically significant (P>0.05). Numbers of crabs on mixed artificial reefs were higher than the other artificial reefs. This was also the same for barnacles

Productivity, biochemical composition and biofiltering performance of agarophytic seaweed, Gelidium elegans (red algae) grown in shrimp hatchery effluents in Malaysia

Aquaculture systems may release large amounts of nutrients into the marine ecosystem that can lead to eutrophication. Many seaweed species are efficient in reducing the nutrient concentration in aquaculture waste. In this study, the agarophyte Gelidium elegans originating from Korea was investigated for bioremediation of tiger shrimp (Penaeus monodon) broodstock effluent (SBE) in a shrimp hatchery in Malaysia. The G. elegans was cultivated in SBE using a semi-continuous culture system to evaluate the effects of elevated nutrients on the biomass, growth rate, quality and quantity of agar, pigment content and biochemical composition of seaweed. In the treatment containing G. elegans, pollutant nutrient concentration was reduced by 100%, and by 78.7%, 47.9%, and 19.6% for ammoniacal-nitrogen, nitrite, nitrate, and orthophosphate, respectively. The seaweed grew well (1.4 ±0.3% d^-1) in SBE and produced appreciable amounts of protein (3.8% DW), carbohydrate (41.4 % DW) and agar (25.9% DW), that were significantly enhanced when cultured in the SBE compared to control. The photosynthetic performance of G. elegans assessment using a Diving-PAM showed the healthy condition of the grown seaweed without any indication of stress in shrimp hatchery effluent. Results showed that G. elegans has biofiltering and bioremediation potential for the shrimp hatchery effluent

Determination of biotechniqe and bionormative of breeding and culturing of Penaeus merguiensis de Man in Bushehr Area

To introduce the native commercial shrimp species to aquaculture industry, the Iranian Fisheries Research Organization conducted a project to investigate the possibility of reproduction and cultivation of the banana shrimp (Penaeus merguensis). The present work has been carried out from 21st March 2001 in two phase, reproduction and cultivation, in Iran Shrimp Research Center. The main objectives of this study was to find the possibility of reproduction and cultivation of banana shrimp with emphasis on its cost and benefit and to find if this species could be introduced to aquaculture industry in Iran. In this work, 42 brood stocks of banana shrimp caught in Jask waters and were transported to Bushehr. The shrimps were reproduced in aquaculture research station, and then cultivated in 0.4 ha ponds in Heleh region. Most of the broodstocks perished, due to long distance of Jask from Bushehr province, or had problem in hatching. Finally 8 of broodstock shrimps spawned. In 3 cases, the reared naplii larva suffered high mortality, but the other 5 spawner’s bread successfully. The post larvae were introduced to the shrimp ponds. The primary stocking was 360,000 larvae, introduced to each of two 4 m 3 tanks. The survival in both tanks for mysis stage was 83% but for PL stages, the survival was 5% for Tank 1 due to disease outbreak (until PL 24), and 62% for Tank 2. On 10 th June 2001 the PL 24 were stocked into the ponds but unfortunately due to adaptation problem, all of the shrimps perished. It seems that banana shrimp couldn’t to be adapted to the pond condition in Heleh region. On the basis of the results, the reproduction of the banana shrimps is achievable, but broodstocks needs to be transferred to reproduction areas as soon as possible to reduce stress on the shrimps. Our finding shows that the optimum conditions of salinity and temperature for growth of the reared banana shrimp in Heleh region is 33ppt and 30 °C, respectively