The Studied Of Food Habit And Growth Of Barb (Barbonymus Balleroides Val. 1842) In Serayu River, Banjarnegara, Central Java
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Date
2013Author
Rumondang
Affandi, Ridwan
Kamal., M. Mukhlis
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A study of food habit and growth was conducted in the Serayu River, where there is Mrica Reservoir. The damming activity has led to habitat fragmentation which affects the pattern of food habits and growth. The aims of this study were, to examine the composition of fish food, to learn about relationship between chemical composition and energy content of the food related to gonad maturity level, and to find out the effects of habitat fragmentation on the composition of food and the growth of fish. The research was conducted from October 2012 to January 2013. Fish sampling was carried out in three zones (downstream, middlestream, and upstream), which consisted of 6 stations. The sampling locations were determined based on the existence of the reservoir, river characteristics and fish habitat. Fish samplings were done using a 3-meter long nets and gill nets with 3 mesh size (¾, 1 ½ and 2 inches) measuring 20 meters in length and 2 meters in width, and electrofishing. There were 1 602 fishes captured and total length are ranged from 64 to 250 mm. Barb was categorized as omnivore fish (with a tendency of being herbivore) with a diet composition of phytoplankton, aquatic plants, detritus, insects, pieces of fish, gastropods and crustaceans. Small-sized fish (64-114 mm) ate phytoplankton and insects, while large fish (115-250 mm) had such food composition as fitoplanton, insects, gastropods, fish, and crustaceans. The food composition was different in each zone. To support the reproduction, the fish consumpt gastropod. The stomach contents of the male and the female are similar. To support their reproduction barb was usually increase the kind of their food from aquatic animal. The chemical composition of 3rd gonad maturity in the middle zone had the highest number of food calories (4.83 kcal /g). The number of calories based on gonad maturity ranged from 3.90 to 5.16 kcal/g. The food of Barb in 1st and 2nd gonad maturity (5.13 and 5.16) have higher energy than 3rd and 4th gonad maturity (3.90 and 4.55). The growth pattern of Barb was positive allometric (p <0.05). The average condition factor of female fish was larger than male. The middle zone had a higher condition factor than the other zones. The asymptotic length of fish (L∞) was 253 mm, the coefficient growth (k) was 1 per year, and the theoretical age when the fish length was equal to zero (t0) -0,087 so that the growth equation of von Bertalanffy of Barb was Lt=253(1-e -1(t+0.087)). The highest natural mortality rate of Barb was found in the downstream zone (0.73), and then by the middle zone (0.58) and the upstream zone (0.57). The highest exploitation rate of Barb was found in the downstream zone (0.93), and then the upper zone (0.70), and middle zone (0.57). The exploitation rate Val.ue of Barb in upstream area of Serayu river was exceeded the optimum exploitation rate value of 0.5.
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- MT - Fisheries [3011]