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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Salinity Levels on Survival Rate and Development of Mud Crab (Scylla olivacea) from Zoea to Megalopa and from Megalopa to Crab Stage) ผู้เขียน: ดร.พัฒนี จันทรโรทัย, รองศาสตราจารย์ ,  ไกรฤกษ์ ทวีเชื้อ, สุภาพ ไพรพนาพงศ์ สื่อสิ่งพิมพ์:pdf AbstractEffect of salinity on survival rate and development of mud crab (Scylla olivacea) were conducted into two phases: phase I from zoea 1 to megalopa and phase II from megalopa to the crab stage. In phase I, four different levels of salinity, 28, 30, 32 and 34 parts per thousand (ppt) were used. The results showed that zoea reared at 28, 30, 32 and 34 ppt developed to megalopa stage with survival rates of 13.16, 22.19, 8.25 and 7.08 percent respectively. At 30 ppt, zoea developed to megalopa stage with better survival rate than at the other salinity levels (P<0.05). In all salinity levels, high mortality rate of zoea occured during the development of zoea 1 to zoea 3 and was higher than that of zoea developed from stage 3 to megalopa. Duration for development of zoea 1 to megalopa at all salinity levels were 23.64-24.22 days which were not significantly different (P>0.05) among treatments. In phase II, the effect of salinity on survival rate and developmental period of megalopa to the fifth crab stage (C5) at salinity levels of 12, 16, 20, 32, 36 and 40 ppt were studied. The results showed that survival rates of the crab developed from megalopa at 16, 20, 32 ppt were 80.95, 76.19, and 80.95 percent respectively. These figures were significantly higher (P<0.05) than those at 12, 36, and 40 ppt. Time used for megalopa to develop into the fifth crab stage (C5) was influenced by salinity. The developmental period to the fifth crab stage from megalopa were 29.14, 28.25, 30.10, 31.75, 32.55, and 43.50 days, respectively. Aging also had influenced on time for crab development. The more advanced crab stage, the longer time used for the development of crab to the next stage. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Population Structure and Size at Maturity of the Orange Mud Crab Scylla olivacea in Klong Ngao Mangrove Swamp, Ranong Province, Thailand) ผู้เขียน:Kanchana Jirapunpipat สื่อสิ่งพิมพ์:pdf AbstractPopulation structure and size at maturity of the orange mud crab Scylla olivacea in Klong
Ngao mangrove swamp, Ranong Province, Thailand was investigated to derive information for its
management. Sampling was carried out monthly during November 2002 to December 2003. The results
showed that the large crabs with a carapace width greater than 8 cm, the weight of male is greater than
that of female. The small sized mud crabs of both male and female accounted for the major catches
while large crabs dominated the lower catches. The size frequency distribution of S. olivacea indicated
that the recruitment of this species was continuous throughout the year with males being recruited in
larger numbers than females. The proportion of males was significantly higher than that of females with
a ratio of 1.3:1 (male: female). The sex ratio of large sized females, with a carapace width greater than
9 cm, varied depending on the spawning period. When 50% of females were mature for the first time
their carapace width was 9.55 cm, as estimated from a logistic model. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Evaluation of Different Larval Feeds for Survival and Development of Early Stage Mud Crab (Scylla olivacea)) ผู้เขียน:ดร.พัฒนี จันทรโรทัย, รองศาสตราจารย์, Praphaphan Temphakdee, สุภาพ ไพรพนาพงศ์ สื่อสิ่งพิมพ์:pdf AbstractThe effects of early feeds and feeding regimes on survival and development of mud crab (Scylla olivacea) larvae were studied in two experimental phases ; phase 1 from zoea 1 to zoea 5 and phase 2 from megalopa to the first crab stage. In the first phase trial, the treatments were characterized by feeding regimes of two types of feeds of which the first feed was applied from outset zoea 1 and later when entering zoea 2, the first feed was partially substituted by the second feed. The treatments of aboved regimes were as followed: 1. rotifer and artemia 2. rotifer and frozen copepod 3. artemia and rotifer 4. artemia and frozen copepod 5. microencapsulated feed and artemia and 6. microencapsulated feed and frozen copepod. It was shown that the survival rate of zoea when developed till zoea 5 were 13.89, 4.00, 2.50, 10.33, 0.11 and 0.00% for treatments 1 to 6, respectively. The survival rates for treatments 1 and 4 were higher (P<0.05) than those of the other treatments. The average time for the development of zoea into zoea 5 were less (P<0.05) in treatments 1 and 4 which were 20.67 and 21.67 days, respectively. The second phase aimed to study the effects of feed on the development of megalopa to the first crab stage. The experiment was randomized into five treatments for the following feeds: 1. artemia 2. chopped mussel 3. artemia and larval shrimp feed 4. artemia and chopped mussel 5. larval shrimp feed and chopped mussel. Survival rates of megalopa developed to the first crab stage were 75.00, 16.44, 63.89, 58.33 and 47.22% for treatments 1 to 5, respectively. There were no significant differences (P>0.05) in survival rates for treatments 1, 3 and 4 and these were higher (P<0.05) than that of treatment 2. The average development time of megalopa to the first crab stage in treatments 1 to 5 were 12.05, 15.22, 10.77, 12.15 and 10.99 days, respectively, which were not significantly different (P>0.05) among treatments. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Morphological Study in Zoeal Stages of Mud Crabs: Scylla olivacea (Herbst, 1796)) ผู้เขียน:ดร.พัฒนี จันทรโรทัย, รองศาสตราจารย์, Kannika Sirisintruwanich, สุภาพ ไพรพนาพงศ์, Chuchart Chayarat สื่อสิ่งพิมพ์:pdf AbstractThe larva of mud crab, Scylla olivacea consisted of five zoeal stages. These zoeal stages were illustrated on the basis of laboratory culture from three ovigerous females. The appendage such as mandible, maxillule, maxilla including antennule, antenna, maxilliped and telson were described showing the difference among the zoeal stages. In the first zoeae, the presence of the sessile eyes and 3 pairs of setae at the telson were used to distinguish from the other zoeal stages. From the second through the fifth zoeal stages, the number of setation on maxillule, maxilla, first and second maxilliped were used to discriminate among these zoeal stages. The more advanced zoeal stages, the more number of setation on these appendages. From the second through the fifth zoeae, the setae on basal endite of maxillule and maxilla were 8, 9, 12, 14 and 9, 10, 12, 16 setae, respectively. The setae on the exopod of the first and second maxilliped were 6, 8, 10, 12-15 and 6, 9, 11-12, 14-16 setae, respectively. For the fifth zoeae, the presence of biramous pleopod on the second to the fifth segment was the key character to distinguish from the other zoeal stages. The zoeal morphology of Scylla olivacea from this study were compared with those of Scylla serrata. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Histological Study on the Development of Digestive System in Zoeal Stages of Mud Crab (Scylla olivacea)) ผู้เขียน:ดร.พัฒนี จันทรโรทัย, รองศาสตราจารย์, นพรัตน์ สระแก้ว, Anong Sawanyatiputi สื่อสิ่งพิมพ์:pdf AbstractHistological study of the digestive system was conducted in the zoeal stages (zoea 1- zoea 5) of mud crabs (Scylla olivacea). The results showed that the digestive system of zoeae could be divided into three parts; foregut, midgut and hindgut. For the foregut, the gastric mill was not present in the cardiac stomach. The gland filter, anterior midgut caeca and posterior midgut caeca were not developed in the first and the early second zoeal stage. However, in the third zoea stage, these structures were developed and progressively increased in the later zoeal stage. The midgut gland or hepatopancreas was developed throughout the zoeal stages (zoea 1- zoea 5). This result showed the complexity of hepatopancreas , the more branched and larger size of this structure were found in the later zoeal stage. |
 ที่มา:FISHERIES RESEARCHหัวเรื่อง:The effect of escape vents in collapsible pots on catch and size of the mud crab Scylla olivacea |
ที่มา:การประชุมวิชาการ ครั้งที่44 มหาวิทยาลัยเกษตรศาสตร์หัวเรื่อง:ชีววิทยาการสืบพันธุ์ของปูทะเล, Scylla olivacea (Herbst, 1796) ในบริเวณเขตสงวนชีวมณฑลระนอง |
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