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Journal : JOURNAL OF COASTAL DEVELOPMENT

BOTTOM WALL CONSTRUCTION OF “JODANG” TRAP APPLIED SELECTIVELY TO BABYLON TIGER (Babylonia spirata) SNAIL SIZE Gondo Puspito; Agus Suherman
JOURNAL OF COASTAL DEVELOPMENT Vol 15, No 2 (2012): Volume 15, Number 2, Year 2012
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

The objective of this research was to obtain net mesh bottom wall construction of “jodang” trap that selective to babylon tiger snails size, i.e. only shell length of    l < 4.27 cm approximately could pass through. There were 3 designs shapes of bottom wall construction tested, i.e. rectangular shape of 2.4 ´ 2.8 (cm) and 2 diamond shapes with net mesh size of 5,6 cm and primary hanging ratio of  E1 = 0.7 and 0.5. The results showed that rectangular shape bottom wall trap construction  was better than those two other constructions. Only 6.78% of snails with l ³ 4.27 cm could escape the rectangular shape bottom wall trap construction. Whereas 41.90% and 17.46% of  snail shells with l ³ 4.27 cm could escape from both the diamond mesh bottom wall trap construction. According  to selectivity curve, the rectangular shape bottom wall trap construction could retained snails with shells length of  l ³ 4.33 cm. The two others retained shells length of  l ³ 4.14 cm and l ³ 4.60 cm.