Djoko Suprapto
Program Studi Manajemen Sumberdaya Perairan Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

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Journal : JOURNAL OF COASTAL DEVELOPMENT

AN OPEN-SYSTEM RESPIROMETER FOR MEASURING STEADY-STATE OXYGEN UPTAKE BY AQUATIC ANIMALS APPLIED TO THE SCALLOPS PECTEN MAXIMUS L. Suprapto, Djoko
JOURNAL OF COASTAL DEVELOPMENT Vol 5, No 2 (2002): Volume 5, Number 2, Year 2002
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

An open-system respirometer for measuring steady-state oxygen uptake rate of aquatic animals is described. The principle of the measurement was to calculate the difference between the oxygen concentrations of the water entering the respiratory chambers with that out from the respiratory chambers. This difference indicated the oxygen consumed by the animals for their respiration. The measuring system was tested to calculate the oxygen consumption related to dry body weight of scallop Pecten maximus L. collected from different populations. This correlation was  expressed by allometric equation as: Y = aXb. The equation was then discussed with the finding of several authors.
EFFECT OF FRESH FEED AND DENSITY TO THE SURVIVAL RATE OF JUVENILE MANGROVE CRAB SCYLLA SERRATA Suprapto, Djoko
JOURNAL OF COASTAL DEVELOPMENT Vol 5, No 1 (2001): Volume 5, Number 1, Year 2001
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

The problem of seed production of Scylla serrata juvenile is the massive mortality due to cannibalism among them that normally happen when the animal undergone the molting. The density of juvenile and the feed play important role to avoid the cannibalism. The aim of the study is to understand the interaction between fresh feed and density in controlling the mortality of the juvenile reared in the laboratory scale. A factorial plot with three levels of treatments of fresh feed and three levels of juvenile densities was used in this experiment. The fresh feed treatment did not significantly influence either survival rate or growth rate of juvenile. On the other hand, the density strongly influenced the survival rate of juvenile but not to the growth rate.
OXYGEN CONSUMPTION OF SCALLOP PECTEN MAXIMUS IN DIFFERENT PHYSIOLOGICAL CONDITION Suprapto, Djoko
JOURNAL OF COASTAL DEVELOPMENT Vol 1, No 3 (1998): Volume 1, Number 3, Year 1998
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

The level of oxygen consumption is one of the indicators of organism physiological condition. It can be used to understand the energetical flow of the organism and finally some measures can be take to manipulate the environmental condition in order to give the optimum environment to grow. A semi open system or semi running system was used to measure the oxygen consumption. The principle of the measurement was to calculate the difference between the oxygen concentration of water entering respiratory chambers with the one out of respiratory chambers. The experiment was using Pecten maximus coming from Brest, Scotland, Ireland, and Saint Brieux. Each population showing difference rate of oxygen consumption, meanwhile oxygen consumption influenced by bodyweight and other physiological conditions. Scotland population having the best performance of energetical balance, compared with the other three population.