Biology and population dynamics analysis of fringescale sardine (Sardinella fimbriata) in Bali Strait waters, Indonesia

Abstract

Fringescale sardine (Sardinella fimbriata) is small pelagic fish that has an increasing production every year. This can trigger the occurrence of overfishing, so it is necessary to study the biology and dynamic population of fish. This research was conducted in December 2016 -May 2017. The purpose of this research was to determine the biological aspects and population dynamic of fringescale sardine (S. fimbriata) in Bali Strait. Samples were obtained from surface gillnet landed in Muncar fishing port, with 1471 of fish. Results showed that sex ratio was about balanced with the proportion of 55% male and 45% female. Length and weight relationship was negative allometric patterns. Length of first mature (Lm) male and female was 11.95 cm and 10.79 cm respectively. Based on dynamics population analysis it was found that length at first capture (Lc) was 10.44 cm. While K, L∞ and t0 were 0.54/year, 19.6 cm and -0.149 year respectively. In addition there was only one peak recruitment occured in 7th month of recruitment pattern. Another analysis indicated that a value of natural mortality (M) was 1.38 with sea surface temperature (SST) of 29.45°C. According to length frequency data total mortality (Z) was 6.41 so that fishing mortality (F) was calculated to be 5.03. Hence value of exploitation rate (E) was 0.79. It can be concluded that the fisheries resources status is categorized as overfishing.

Growth and Mortality, Recruitment and Exploitation Rate of Fringescale Sardinella Sardinella fimbriata (Valenciennes 1847) in Rote Island in the Savu Sea

“…Compared to previous studies, similar results were obtained from Banda Aceh with negative allometric growth (b < 3), which was 2.44 (Perdana et al, 2018). Bintoro et al (2019) also reported a negative allometric growth (b = 2.804), whereas research on the southeastern coast of India, the Bay of Bengal and the East Indian Ocean showed 3.14 (b > 3) (Karuppiah et al, 2020). The differences in the b values were due to differences in environmental conditions and the caught fish size.…”

“…After that, it continued with the determination of the cohort of long-frequency distribution data using the Batthacharya method (Sparre andVenema, 1998 in Tangke et al, 2021). Analysis of the long-weight relationship was done using the Pauly equation (Bintoro et al, 2019;Bintoro et al, 2020) with the equation W = aLb, where W is the body weight of the fish, L is the total length, a is the intercept and b is the slope. This equation is then converted into a linear equation to obtain the values of a and b, namely Log W = Log a + b Log L. Estimated parameters a and b are obtained using regression analysis with Log W as Y and Log L as x with the equation y=a+bx.…”

“…They showed negative allometric growth patterns and fecundity ranges of 2801-60 578 eggs with a diameter range of 8-67 µm. In the study of biology and population dynamics in Bali strait waters, Bintoro et al (2019) reported that the value of exploitation rate (E) was 0.79, meaning that the fisheries resources status is categorized as overfishing. Meanwhile, Bintoro et al (2020) showed that the overfishing situation occurred in Prigi waters in Trenggalek, East Java.…”

The Environmental Friendliness Level of Boat Bagan Fishing Gear in Belitung Regency

“…Bintoro (2019) stated that the length of the first mature gonad fringescale sardinella in the Bali Strait for males and females was 11,95 cm and 10,79 cm respectively [6]. In the study of Aryuningka (2016) in the Sunda Strait, the first mature female fringescale sardinella gonad is 157 mm.…”

“…After analyzing all the obtained data, if the length of fish that is caught most (Lc) less than LM, it can be concluded that the fishing gear is not selective and vice versa, but this remains based on each species. To obtain data for LM the main target catch by referring to the previous research such as research of Bintoro [6] for fringescale sardinella, Nugraha [7] for spotted sardinella, and Fauziyah (2012) for devs' anchovy.…”