1 1562-2916 Iranian Fisheries Research Organization 3155 Biotechnology Physiochemical changes in tissue of edible oyster Crossostrea glomerata at refrigerated temperature Zamir R. Khan A. Qasim R. 1 1 2001 3 1 1 12 11 12 2017 11 12 2017 Oysters are bivalve molluscs in the family Osteridae of the order Ostereoida and are found throughout the world. Quality of stored muscle of oyster, Crossostrea glomerata depends on the temperature and storage time. Investigation on factors responsible for spoilage of oyster meat in refrigerator (7±2°C); in term of biochemical indices, indicated that in 1-2 days the following changes will accur: oyster tissue total protein from 7.6±0.44g% to 7.06±0.64g%, salt soluble protein from 3A6±0.52mg% to 2.53±0.14g%.Totallipid from 3.0±0.38g% to 2.5±0.29g%, TMA from 1.1±0.11 mg% to 1.46±0.09 and TVB, from 946±0.29mg% to 19.33±0.06 and on 7th day of storage, total protein to 4.5±0.32g%, salt soluble protein to 1.1±0.21g%, total lipid to 1.4±0.19g%, TMA, to 4.3±0.41 mg% and TVB to 83.3±3.5 changed. Amount of Glycogen in fresh meat was 5.3g% which decreased to 3.2g% during 7 days storage. Water content in fresh tissue was 79.0±0.57g% and increased at 7±2°C gradually with the increase of storage time. After 7 days it reached to the highly significant (p<0.001) value of 89.1±0.54g%.pH in fresh tissue was also noted 6.60±0.17and slightly non significant change was observed during 7 days of storage. On the 7th day it decreased to 6.3±0.05 from its fresh tissue value significantly (p£0.001) with storage time. Results concluded that oyster meat could be preserved for 4 days up to acceptable refrigeration temperature.
3156 fish disease Specific composition and morphological peculiarities of endemic monogenean parasites of freshwater fishes of Iran Jalali B. Shamsi Sh. Imanzadeh F. 1 1 2001 3 1 13 22 11 12 2017 11 12 2017 Result obtained during ten years research work (1990-2000) on distribution of monogenean fauna Iranian fishes indicates that its composition of monogenean fauna of Iranian fishes depends on their habit and since Iran includes three different zoogeographical zones with highly endemic fish hosts, its monogenean parasites have specific composition. The Caspian fauna is characterized by relatively great diversity of monogenean species (eleven genera and at least forty-eight species). Presence of some species with sphymoid type of anchors is one of its speciation. The Iranian part of Mezopotomian (Tigris) fauna (six genera and at least twenty-six species) is characterized by distinct monogenean parasites, for instance, presence of Dogielius type of anchors and prevalence of Dactylogyrus spp. with morphilogical peculiarities not similar to Sarmatian fauna. The most of its specific character is the shape of dorsal and ventral bar in Dactylogyrus species found in the Tigris Zone. Endemism in the a forsaid zone is high therefore species of Dactylogyrus will be increased more. The oriental monogenean fauna of Iran (three genera and at least eleven species) shows special characteristics, amongthem, the presence of one connective dorsal bar only, presence of varicorhinoid type of bar and haptor would suggest that aforesaid zone of Iran has been influenced by the Indian fauna.  3157 Biology & physiology Condition of pH and ionic composition of water in a macrophyte dominated reservoir (Hanna Reservoir- Isfahan Province), Iran Esteki A.A. 1 1 2001 3 1 23 38 11 12 2017 11 12 2017 2/3 of the reservoir surface area was approximately covered with dense populations of Myriophyllum, Ceratophyllum and Potamogeton species. The headwaters of the reservoir were considered as hard water and had both carbonatic and non-carbonatic hardness. When they were exposed to lentic condition of the reservoir and its intensive photosynthetic activities of macrophyte communities, the bicarbonate ions were absorbed significantly and the pH of water increased to relatively serious levels and calcium carbonate precipitated as subsequontly. These processes caused a significant decrease in calcium and bicarbonate ion concentrations of the water column of the reservoir. Thus, in the headwaters, calcium and bicarbonate ions were dominated and the cationic and anionic ratios in water were in the order of Ca2 +>Mg2+>Na+ and HCO3 >C  l->CO32->SO4-2 respectively. But in the water column of the reservoir, due to above mentioned reasons, magnesium and chloride ions prevailed and ionic status order changed to Mg2+ >Ca2+>Na+, and C l->HCO3->CO32->SO42- 3158 fish disease Influence of infestation by Labratrema minimus (Bucephalidae: Digenea) on oxygen consumption of edible cockle Cerastodema edule (Mollusca: Bivalvia) in laboratory conditions Javanshir A. 1 1 2001 3 1 39 54 11 12 2017 11 12 2017 Short-term oxygen consumption and filtration rate experiments were conducted to evaluate the response of edible cockle Cerastoderma edule when infested by the Digenean trematod Labratrema minimus. In this experiment the metabolic activities of bivalves were measured to detennine this particular aspect of the host-parasite interaction. We have used the Bucephalidae digenea Labratrema minimus infestation as a factor which can alter the metabolic rates of its host: the edible cockle Cerastoderma edule from Arcachon bay (France). The results show that specific oxygen consumption of infested cockles decreases in comparison with that of healthy ones. This decrease in specific pumping rate is partly due to increase in the total cockle biomass measured, which is due to the presence of the parasite and can represent 20% of a healthy cockle's O2 consumption (it can constitute up to 92% of live mass in high infestation ii1tensities(personal observations; 1996) but consume little oxygen. In addition, the disease provoked by infestation can reduce the true metabolic activities. The results show that pumping rate is related to the intensity of the infestation with greater infestation associated with lower oxygen consumption. We also demonstrate that L. minimus is capable of oxygen consumption regulation. The consumption rate is maintained below 0.3 mmol O2 min-1 g-1 FDW (Fresh Dry Weight) in all external oxygen concentrations experimented. 3159 Ecology Application of adaptive sampling in fishery part 1: Adaptive cluster sampling and its strip designs Salehi M. 1 1 2001 3 1 55 76 11 12 2017 11 12 2017 Abstract:  The precision of conventional sampling designs is not usually satisfactory for estimating parameters of clump and rare populations. Many of fish species live in school and disperse all over a vast area like a sea so that they are rare compare to their habitats. Theory of a class of sampling designs called adaptive sampling designs has rapidly grown during last decade which solved the mentioned problem. These sampling designs are successfully used to asses fish life stocks in number of cases. The first aim of this article is to develop some versions of adaptive sampling which are more useful for fishery study. The author will introduce Adaptive Cluster Sampling (ACS) and its strip version which is more useful for fishery and marine studies. Since the parameter of interest is usually the density in fishery study, estimators of the density are developed in this article. In many biological studies, it has been shown that non-overlap two stage adaptive sampling and strip adaptive sampling are very efficient sampling designs so that we also develop non-overlap two stage adaptive cluster sampling of strips. The second aim of this article is to introduce adaptive cluster sampling to our fishery researchers' community and demonstrate the idea and computation to those who know statistics in some level. 3160 Ecology Application of adaptive sampling in fishery part 2: Truncated adaptive cluster sampling designs Salehi M. 1 1 2001 3 1 77 84 11 12 2017 11 12 2017 There are some experiences that researcher come across quite number of time for very large networks in the initial samples such that they cannot finish the sampling procedure. Two solutions have been proposed and used by marine biologists which we discuss in this article: i) Adaptive cluster sampling based on order statistics with a stopping rule, ii) Restricted adaptive cluster sampling. Until recently, the unbiased estimators were not available for both sampling. Restricted adaptive cluster sampling was used (Lo et al., 1997) under investigation in US Southwest Fisheries Science Center which was reasonably efficient even with a biased estimator. Salehi and Seber (2002) propose an unbiased estimator for this sampling design. They show that the unbiased estimator is shown to compare very favorably with the standard biased estimators, using simulation. 3161 Biotechnology A study on the production of gelatin from sturgeon fish skin Kouchakian Sabour A. Zare Gashti Gh. Sababi H. Moeini S. 1 1 2001 3 1 85 87 11 12 2017 11 12 2017 Gelatin was extracted from hydrolyses of collagen muscle bonds. Gelatin was of two types. Type A was obtained from acidic and type B from alkaline procedures. In the present study we used sturgeon fish skin to produce 25 samples of gelatin. Microbiological and chemical examinations were conducted on the gelatin samples. Based on the results obtained from the chemical examination, gelatin type A and B were composed of 15.40% and 15.30% total nitrogen, 0.30% and 0.25% CaO, 6.48% and 7.26% moisture, 1.59% and 2.89% ash, and 1.51% and 1.2% fat, respectively. The pH of gelatin A was 4.23 and that of B type was 7.00. Total count obtained from microbiological examinations was 10-70 cfu/g. The quality of gelatine prepared from sturgeon skin met the requirements of standard gelatin. Time required for production of gelatin using acidic procedure was one week whereas the production of gelatin using the alkaline procedure lasted 3 weeks. The yield of gelatin obtained from alkaline procedures (4.52%) was less than that of acidic gelatin (6.33%).