Cerezo, Rolando B. <br/><br/>
Effect of different types of shelter on the production of mud crab, scylla serrata juveniles in concrete nursery tanks / 
by Rolando B. Cerezo. 
 - Miagao, Iloilo :  University of the Philippines in the Visayas,  2001. 
 - viii, 70  pages :  illustrations ;  28 cm. 
<br/><br/> Thesis (MS Fisheries -- Aquaculture) University of the Philippines in the Visayas 
<br/><br/>Includes bibliographical references. 
<br/><br/> CEREZO, ROLANDO B. University of the Philippines in the Visayas, September, 2001. “Effect of Different Types of Shelter on the Production of Mud Crab, Scylla serrata, Juveniles in Concrete Nursery Tanks”. Thesis Adviser: Romeo D. Fortes, PhD.<br/><br/>The study was conducted to determine the effect of different types of shelter on the production of mud crab, Scylla serrata, juveniles in concrete nursery tanks. One day- old mud crab megalopae were nursed at four different treatments: Treatment I (Nylon ribbon screen), Treatment II (Nipa shingle), Treatment III (Piled cobbles) and Treatment IV (Control/No shelter). Weight increment, production and survival of nursing megalopa to crablets were analyzed in each treatment.<br/><br/>Treatment I (Nylon ribbon screen) had the highest mean final weight (0.4567g), percentage weight increment (7387%) and specific growth rate (14.39%) which was significantly higher (P<0.05) than Treatment II (Nipa shingles’ mean final weight of 0.33672; 5420% percentage weight increase and 13. 37% specific growth rate). However, it was not significantly different than Treatment 3 (Piled cobbles) and Treatment 4 (No shelter). .<br/><br/>Total production in terms of weight showed significant differences (P<0.05) among treatments. Treatment 1 was significantly higher (5.36g) than Treatments 2 (2.35g) and 4 (2.75g) but was not significantly different than Treatment 3 (4.24g). The differences in the rates of survival and the sizes of crablets produced in each treatment may have contributed to this statistical difference.<br/>Treatment I had the highest mean survival rate (26%) followed by Treatment 3<br/>(22%), Treatment 4 (16%) and Treatment 2 (15%). Analysis of variance however, did<br/>not show significant differences among them.<br/><br/>Results indicated that there was a positive effect of the Nylon ribbon screen as shelter used to the total weight gain and production of m<br/> 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crabs<br/>Crab culture<br/>Scylla serrata
<br/><br/><label>Dewey Class. No.: </label>565  / C33 2001