1 2015; 2(1): IJMRD 2015; 2(1): Received: Accepted: e-issn: p-issn: Impact Factor: Minette Tabi Eyango Tomedi Institute of Fisheries and Aquatic Sciences at Yabassi, the University of Douala, P.O.Box 2701, Douala, Claudine Tekounegning Tiogué Ichthyology and Hydrobiology, Department of Animal Productions, Faculty of Agronomy and Agricultural Joseph Eben Penkem Ichthyology and Hydrobiology, Department of Animal Productions, Faculty of Agronomy and Agricultural Eric Mialhe Aquasol S.A. Structure, Irad of Kribi, Department of Ocean Southern- Correspondence: Claudine Tekounegning Tiogué Ichthyology and Hydrobiology, Department of Animal Productions, Faculty of Agronomy and Agricultural Effect of salinity on survival and growth performances of juveniles of marine shrimp Penaeus notialis (Perez Farfante, 1967) under controlled conditions in the tropics Minette Tabi Eyango Tomedi, Claudine Tekounegning Tiogué, Joseph Eben Penkem, Eric Mialhe Abstract Effect of salinity on survival and growth performances of marine shrimp Penaeus notialis fingerlings was carried out between April and September 2011 at AquaSol structure in IRAD of Kribi in A pregnant female with total weight 32 g and 15 cm total length has been collected in the natural environment by a fisherman using a bottom thread. Thirty 20 days old post larvae (PL20) born from this progenitor were seeded in triplicate in plastic bins at 15 (S0), 20 (S1), 25 (S2) and 30 (S3) salinity. Survival rates were high regardless of salinity. However, the higher survival rates (94.44 and 96.67%) were respectively recorded from 25 and 30 salinity. The higher feed conversion ratio, mean weight and weight gain were obtained at 15 salinity. The best specific growth rate was recorded at 20. Keywords: Exogenous factors, Penaeus notialis, growth, survival, Cameroon 1. Introduction Aquaculture involves several types of livestock including shrimp culture. According to  shrimp is the most consumed product in the world . Aquaculture farms provide 20 to 25% of the world's marine shrimp production . Asia is the largest supplier of shrimp in the world with 88% of production, 41% from China alone . The rest (12%) is largely provides by the Latin America. According to  shrimp farming is recent in Africa and in most cases, African farms produce the shrimp Penaeus monodon; highly appreciated in the world market for its growth performances . In Cameroon the data available on the shrimp fishery were merely within the marine capture . Despite the production of freshwater shrimp; shrimp production increased from 2000 tons in 1972 to around tons in 2006 . This drastic decline in shrimp production is the result of overexploitation, climate change, pollution and destruction of mangroves for shrimp spawning grounds; associated with rapid population increase . To this context, the need for domestication and biodiversity conservation of endogenous shrimp was imposed; therefore the first potential breeding structure of shrimp was construct in Cameroon . The breeding success of all living species implies a good control of its environment. According to , physico-chemical water conditions are essential to the vital functions of aquatic species. The study on the effect of salinity in survival, growth, and osmotic capacity of early juveniles of Farfantepenaeus brasiliensis have shown that when juvenile shrimp are exposed to environmental variations, there occur changes in the osmotic and ionic balance as well as assimilation and growth . Furthermore, domestication and breeding of a species depends on the knowledge of the factors promoting its growth and survival . The basis of the shrimp farming relies on the availability of larvae / post larvae . Temperature and salinity are among the most important environmental factors affecting the breeding of post-larval penaeid . In Cameroon, some studies have already been conducted in captivity on the effects of environmental factors on shrimp reproduction and growth to the mysis and post-larvae1 stages [12, 13, 14, 15, and 16]. To our knowledge no study has been done on the effects of these factors on juvenile rearing. This work is therefore devoted to evaluate the effect of salinity on the survival and growth of juveniles of marine shrimp Penaeus notialis in captivity. ~ 134 ~
2 2. Materials and methodes 2.1 Study area The study was carried out in the AQUASOL SA structure, IRAD Kribi, Department of Ocean in Southern Cameroon region (latitude 2 56 N et longitude 9 54 E), between April and November The climate is classic guinean type with maritime predominance. It offers two main climatic shades: maritime nuance and shade within Guinea, respectively introduced by the proximity of the sea and continentality . In fact, the oceanian climate is warm and rainy. There are four seasons reducing in the coastal area into two main seasons: a long rainy season (March to October) and a long dry season (November to February); there are no completely dry months. Average rainfall and temperature are respectively 2970 mm and 26 C. This Department is characterized by a particularly dense hydrographical network, with many rivers (Kienké, Lokoundjé, Lobe, Nyong and Ntem), most of which are rooted in the South Cameroon Plateau and all flow into the Atlantic Ocean . The hatchery is located in the border of the sea and far enough away from rivers joining it to prevent the influx of fresh water (greater than 25 ppt salinity) and water too loaded with suspended solids. 2.2 Origin and maintenance of spawning stock A pregnant shrimp (total weight 32 g and 15 cm total length) was collected in the natural environment (sea) by a fisherman using a bottom mesh. In the hatchery, it was kept in a concrete storage basin, of cylindrical shape of 3.14 m  volume. This basin was filled with sea water filtered through a 5µm pocket attached to the water supply piping for seawater. Aeration was provided by two air-lifts maintaining a dissolved oxygen level of 3 mg / L in the tank (with a temperature of 28 C, the salinity of 29, ph 7.8 and a NO 2 rate of 0.8 mg / L). The spawner was fed daily to 3% of its body weight in a compound feed (crab gonads, crab meat, granules for breeding, mollusks and sardines); in a 4 hour gap. Siphoning of leftover food and feces was performed every morning to reduce the organic contamination of water and raise the level of ammonia. The water renewal was done once a day to less than 100% of the volume of the basin 2.3 Egg laying and hatching The spawner was transferred to the cover with a tarp breeding tsank to create a dark environment and thus ensure better conditions for spawning. Spawning was observed at 02:30 the next day. While the female was removed from the tray and marked in the eye by a numbered ring and then returned to the concrete storage basin. Egg collection was made by siphoning through the drain device installed at the tank bottom. Eggs were then rinsed with water filtered at 5 µm for 5 min at the same salinity and temperature as the water in the hatching tank. They were then transferred into a bucket of 100 liters using hatching tray, filled with filtered water to 5µm, salinity of 28, and at a temperature of 30 C (optimum) obtained and maintained by an electrical resistance at 300W. Hatching occurred between 12 and 15 hours after laying (J0). 2.4 Production of 20 days old post larvae (PL20) of P. notialis Larval rearing had lasted 28 days and consisted in obtaining PL20 through the Nauplii phases, Zoe, Mysis and post- larvae. During the Nauplii phase, Nauplii (1 to 5 hours) feed on their yolk reserves, mutate and move on to the Zoe phase from 18h (J1). Zoe larvae were able to feed on living and purified diatomaceous algae (Thalassiosira pseudonana), microparticles (Larval AP 100, Zeigler) powder, size < 50µm and imported nauplii of Artemia salina. At the end of this phase, the larva becomes Mysis to fairly strict carnivorous diet. Mysis were fed to Nauplii of Artémia salina. Following a metamorphosis, Mysis III becomes a young shrimp very similar to the adult animal, called Post larvae (PL1). The young post larvae lead a pelagic life, but changes gradually in behavior. Obtaining PL20 lasted for 20 days and the seeding density was 20 PL / liter, whether 2000 PL1 per plastic tray of 100 liter. The food distribution period varied according to the type of food (dry food or Nauplii of Artemia salina). 2.5 Experimental design: Survival and growth of 20 days old post-larvae (PL20) of P. notialis at different salinities The approach was that of . The survival and growth were conducted in four concentrations of saltwater (15, 20, 25 and 30 ), in triplicate and at 27.7 C of temperature. 30 animals in triplicates were randomly distributed in 12 plastic containers of 100 l at a density of 1PL20 / liter. These larvae were fed on commercial diet with 50% protein pellet 1mm in diameter and 0.75 g ration by ferry, 5 times a day to 4 hours interval. Bromatological characteristics of the food were as follows: 10% moisture, 50% protein, 10% fat, 3% fiber, 12% of vitamin and 0.8% P / Ca. The foods were weighed using an electronic balance of 0.01 g accuracy, brand Sartorius Competence. The salinity was measured by a salinometer. The photoperiod was artificial (100% artificial light). Other physical and chemical parameters of the water (temperature, dissolved oxygen, ph, and nitrite) were measured daily during the test using respectively a mercury thermometer, oxy-meter mark "Oxy-check-HI, 9147" and JBL ph TEST and Tetra Test NO 2. The cleaning was done by siphoning with a hose every morning; and the water renewal every two days. The control fishing took place every ten days. At day 30, all tanks were emptied. At the beginning of the test, at each control fishing and at end of the experiment, shrimp were counted and weighed using an electronic balance, with precision 0.01g and brand Sartorius Competence. The following parameters were studied: Survival rate (SR (%) = (Nf/Ni) X 100 with Ni and Nf : number of shrimp at the beginning and at the end of experiment respectively); Food conversion rates (FCR = Rd / (Bf Bi) where Rd (g): ration distributed for a fixed period, Bf (g) and Bi (g) : initial and final biomass of shrimp) ; initial (imw) and final (fmw) mean weights, gain weight (WG (mg) = fmw imw); mean daily gain weight (mdgw (mg/j) = (fmw imw)/t,with t : time in day) and specific growth rates was calculated according to  formula (SGR (%) = 100 [Ln fmw Ln imw)] t where Ln : logarithm Neperian). 2.6 Statistical analysis Data were subjected to analysis of variance (ANOVA I), and when the differences were significant, means were separated using the LSD test at 5% probability level. ARC-VIEW software was used for this analysis. ~ 135 ~
3 3. Results 3.1 Survival rate of juveniles of P. notialis by age depending on water salinity Figure 1 shows the survival rate of P. notialis juveniles at different salinity. It is appears that whatever the salinity, survival rates were high ( 80%). However, the S2 and S3 salinity showed similar survival rates and significantly higher (P 0.05) than the other concentrations a 94,44 a 96,67 94 Survival rate (%) b 88,89 ab Salinity ( ) (a, b, c) : each column with same superscript were not significantly different (P 0.05). Fig 1: Average survival rate of P. notialis juveniles rearing in trays within 30 days depending on water salinity Feed conversion ratio of P. notialis juveniles by age and depending on water salinity Figure 2 illustrates the feed conversion ratio in P. notialis juveniles by age and depending on water salinity. It follows that whatever the water salinity, 50 days old post larvae (PL50) less converted significantly (P 0.05) the food than younger. Furthermore, the 30 days old (PL30) and 40 days old (PL40) post larvae significantly (P 0.05) better converted food respectively on S3 and S1 salinities. Feed conversion ratio PL 30 PL 40 0 Salinity ( ) Fig 2: Evolution of feed conversion ratio depending on water salinity and age of P. notialis juveniles in trays ~ 136 ~
4 3.3 Growth performances of P. notialis juveniles depending on water salinity From Table 1 shows growth performances of P. notialis juveniles depending on water salinity, it appears that shrimp rearing in S1 salinity, recorded (P 0.05) the higher growth performances, except the specific growth rate (SGR) which was significantly higher at 25 salinity (S2). S3 salinity recorded the weakest growth performances (P 0.05). Table 1: Growth performances of juvéniles of P. notialis in function of water salinity in plastic bowls Growth parameters Water salinity ( ) mwi (mg) 10 ± 03 b 22 ± 05 a 7 ± 00 c 13 ± 00 b mwf (mg) 242 ± 00 a 240 ± 02 a 224 ± 07 a 202 ± 09 b mgw (mg) 116 ± 02 b 131 ± 04 a 113 ± 06 b 97 ± 07 b mdwg (mg/j) 7,7 ± 0,4 a 7,3 ±1,15 a 7,2 ± 2,3 a 6,3 ± 3,10 a SGR (%/j) 10,56 ± 4,78 a 7,98 ± 2,84 b 11,55 ± 4,24 a 9,14 ± 2,26 ab (a, b, c) : each line with same superscript were not significantly different (P 0.05). mwi = mean initial weight (PL20), mwf = mean final weight (PL50), mgw = mean gain weight, mdwg = mean daily weight gain, SGR = specific growth rate, (S0, S1, S2 et S3) = Salinity rate at 15, 20, 25 et Discussion 4.1. Survival rate The value of ± 4.43% is the best survival rate which implies the best salinity to 30. Survival rates in this study are significantly higher than 5.57% and 16.67%, respectively, reported by  and  in Mexico. This superiority could be due to differences in experimental conditions . Indeed, these authors worked at a water temperature of 25 C, photoperiod of 12 hours of daylight and 12 hours of artificial light, and food to 37% protein. In contrary for this study, the mean temperature was 27.7 ± 0.05 C with 100% of artificial illumination and a food to 50% protein. However, our study respected the optimal conditions of temperature (between 17 and 28 C) and salinity (between 15 and 30 ) were different for salinity levels (between 20 and 38 ) as indicated by  Feed conversion ratio The feed conversion ratio is the efficiency of a food on shrimp production; higher it is, the food is less efficient. At the juvenile stage, the mean values (3.5, 2.5, 2.51 and 2.2) obtained at different salinity are greater than 1.8 which is the optimum value . However these values are similar to 2.5; which is the tolerated value and beyond which the profitability random deviate . These results are different from those reported by . Contrary to environmental conditions in our study, the tests of these authors were conducted at the optimum temperature for breeding and the animals were fed with a food protein level below 50% Growth performances The best mean final weight was recorded at 15. These results are different to those of  reported to the salinity of 30, a temperature of 25 C and from 60 days old post larvae (PL60). They are moreover similar to those of  from Litopenaeus stylirostris at the same salinity. The specific growth rate recorded in this study varied depending on the water salinity. These rates were higher than those reported by  in Penaeus vannamei. This would probably be due to differences in experimental conditions, or to intrinsic factors related to the species. In fact, these authors worked under optimum conditions of temperature, ph, dissolved oxygen, nitrite and nitrate. ~ 137 ~ 5. Conclusion At the end of this study on the effect of salinity on the survival and growth performances of P. notialis (Perez Farfante, 1967) juveniles, the main conclusions are as follows: The survival rate was high regardless of the level of salinity. The highest survival rates were obtained at salinity 25 and 30. The very best weight growth performance has been recorded on the group of animals subjected to the 15 water salinity in terms of the FCR, mw and WG. The highest SGR was recorded in the group of animals subjected to the treatment 25. In short, the rate of salinity 25 and 30 may be recommended for improved survival and high growth performance of P. notialis juveniles in tropical conditions. However, to complete this study it would be desirable to assess in this species, the combined effect of temperature and salinity on the survival and growth performances of juveniles at same age. 6. 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