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Articles by Efrizal
Total Records ( 3 ) for Efrizal
  Efrizal , A. Arshad , M.S. Kamarudin , C.R. Saad and S.M.N. Amin
  This study was carried out to observe and describe sexual dimorphism, reproductive system, macroscopic and histological gonad development and Gonado Somatic Index (GSI) of blue swimming crab (P. pelagicus) during post-spawning, spent spawner and berried female under laboratory conditions. The general sex dimorphism and reproductive system of male and female blue swimming crab were observed similar to be most other decapods crustaceans. The pubertal molt, the abdomen and gonopores of female show changes that are generally accepted as external morphological indications of sexual maturity. Unlike female, the males show prepubertal (loosing of the attachment of the abdominal flap to the cephalothorax) rather than pubertal molt. The ovaries and testes were classified into five and three development stages and the ovarian histology of each stage was characterized. The ovarian stages correlated closely with the Gonado Somatic Index (GSI), the characteristics of ovarian histology and oviposition period.
  Indra Junaidi Zakaria , Rera Agung Syukra , Izmiarti and Efrizal
  Background and Objective: The gluing method has good prospect to the growth of transplanted coral if compared to the regular binding method. This study aimed to determine the differences in growth rates between transplanted corals with these two methods. Materials and Methods: Coral seedlings used in this study were about 70-129 mm in size, taken from the branching life form of Acropora genera. Coral transplantation were mediated through regular the binding method and the gluing method, before the experiment result statistically tested with Mann-Whitney test. The experiment consisted of 2 treatments and 20 replicates. Results: The absolute growth rate, the monthly growth rate and the branching rate of transplanted coral between the two methods were not different (p>0.05). On the other hand, the survival rate and quantitative carbon absorption of corals transplanted with gluing method were observed better than those with binding method. All transplanted corals through gluing method survived, while those transplanted with binding method survived 95% (19 living corals from initial 20 observed samples). The gluing transplanted corals averagely absorbed carbon as much as 23% (11.38 mg L1), while the other method absorbed only 18% (8.99 mg L1). Conclusion: There is no significant difference of the growth rate between gluing transplanted corals and binding transplanted coral, however, the first method showed better survival rate and the carbon absorption than the later.
  Efrizal , Rusnam , Suryati , Nofa Yolanda , Ferry Lismanto Syaiful and Ainul Mardiah
  Background and Objective: Spinach extract (Amaranthacea tricolor) is a very prospective feed raw materials to stimulate the molting and growth of crab female broodstock. The purpose of this study was to evaluate the quality of broodstock females, Portunus pelagicus (Linnaeus, 1758) at different levels of spinach extract based on physical, organoleptic and chemical tests. Materials and Methods: Four different treatments of spinach extract (0, 250, 500 and 750 ng g1 crab, respectively) were used in this study. The female crab samples were collected from coastal region of Padang, West Sumatera and placed randomly in four concrete tanks (200×100×100 cm). Each concrete tank consist of five units of plastic box (45.5×32.5×16.5 cm) with the maximum density was one crab per box. Results: The organoleptic test showed that formulated diets enriched with spinach extract (0, 250 and 500 ng g1 crab) had a smooth texture, pungent aroma and brown. Whereas from the physics test results obtained good water stability (rupture velocity ranged from 89.20-105.40 min and solids dispersion ranged from 4.97-7.17%), hardness (92.66-98.07%) and sinking velocity (3.88-5.88 cm sec1) (p<0.05). The results also showed that formulated diet enriched with spinach extract doses of 250-750 ng g1 crab gave a value of delicacy of feed (0.195-0.386 g crab1 weight/day) which was significantly different (p<0.05) with 0 ng g1 crab (0.445 g crab1 weight/day). The chemical test shows the moisture content were 11.60%, ash 9.31%, protein 44.38%, fat 7.64% and carbohydrate 14.46%. Conclusion: It was concluded that there was a linear relationship between dose of spinach extracts in formulated diet and rupture velocity and a quadratic relationship between dose of spinach extracts in formulated diet and solid disperse, hardness and sinking velocity and delicacy of feed.
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