Celeste B. Atas, Sandee Kaye R. Briones, Christabel T. Nalangan (March 2010)
Philippine Science High School Western Visayas Campus – Department of Science and Technology (DOST-PSHS WVC), Brgy. Bito-on, Jaro, Iloilo City 5000, Philippines
ABSTRACT
In the Philippines, Acetes serve as one of the primary source of income to both fishermen and vendors of shrimp paste. It is necessary to understand the population parameters of Acetes shrimps to undertake effective management on the local Acetes shrimp stock.
The mean total length, length frequency, sex ratio, maturity ratio and biomass of Acetes spp. were determined. Collection of shrimps was done starting from July to December 2009 in Banate Bay, Anilao. Of the 12.5%, 500 were sampled and examined. The sex ratio was determined by using a ruler. SPSS Version 18.5 was used for the sex ratio analysis. The biomass was determined using the dry weight (DW) method.
The mean length of the shrimps were found out to be 17.06 (± 4.36)mm and 17.66 (± 4.61) for the males and and females respectively. The minimum and maximum lengths were 5mm and 32 mm and 5mm an 37 mm for males and females, correspondingly. A total 5500 shrimps that were examined for sex ratio of which 1865 (33.91%) were males and 3612 (65.67%) were females, the over-all result indicated that the sex ratio of males to females was 1:1.94. In the catch, more adults were observed than juveniles. November had the highest shrimp biomass of 11135.2 g.
The demographic characteristics of Acetes showed that females were more numerous than males in all body sizes as adults were more numerous as compared to juveniles in all months.