The Length-Weight Relationship and Condition Factors of Bullet Tuna Landed at the Tanjung Luar Fishing Port, Indonesia

Abstract

HighlightBullet tuna (Auxis rochei Risso 1810) has been identified (measured, weighed) and analyzed.The resource status of bullet tuna has been estimated based on body shape and age group.LWR curve is implemented to describe and express the age group of bullet tuna (immature, adult/mature, old)This study has resulted the composition and ratio of bullet tuna that is suitable to be caught, fit for consumption and worthy of maturationAbstractBullet tuna (Auxis rochei Risso 1810) or tongkol lisong (Indonesian) is important for human consumption and health as well as an income source for fishers and coastal communities. Its utilization problems are over exploitation, catch domination by immature groups, and the threatened stock security of the bullet tuna (BLT). This research aimed to determine the status of the prospective parent of bullet tuna caught in the Lesser Sunda region, particularly from the Alas Strait to the Indian Ocean, West Nusa Tenggara (WNT). Meanwhile, the data were collected from July to September 2020 (2nd transitional season) at the Tanjung Luar Fishing Port, East Lombok and a dependent survey method was adopted with sampling, interview, observation, and documentation techniques. Fork length and body weight data were used to estimate the length and weight relationship, growth pattern, condition factor, fish age group, and catch worth. The primary and secondary data were processed quantitatively using several equations. The growth pattern of bullet tuna was minor allometric (b = 2.875), worth selling (K > 1.00), and the majority was adult fish or mature group. The LWR model is . This condition indicates the bullet tuna is worth catching and worth spawning, so that it is eligible to be a potential broodstock candidate to support a sustainable management of BLT fisheries. Furthermore, fishers have applied the code of conduct for responsible fisheries (CCRF) in supporting the sustainable development goals.

Influence of Colors on the Catching Performance of Artificial Lures of Multiple Troll Line in Bongao Waters, Tawi-Tawi, Philippines

“…For eastern little tuna, some reports that this fish exhibited isometric growth close to 3 (Rohit et al 2012;Ahmed et al 2015), but most reported that it likewise showed positive allometric growth (Al-Zibdah and Odat 2007; Arnenda et al 2020;Herath et al 2019;Lelono and Bintoro, 2019). For bullet tuna, it was reported that this fish showed positive allometric growth patterns (Herath et al 2019), and other studies reported that its growth was minor allometric (Asrial et al 2021). In the length-weight relationship, when b is less than 3, fish become slimmer with increasing length, and growth will be negatively allometric.…”

Length-weight Relationship and Condition Factors of Endemic Fish, <I>Lagusia micracanthus</I> Bleeker, 1860 (Pisces: Terapontidae) in Gilireng River, Wajo Regency, Indonesia

“…The obtained value "b" can be used to determine the fish growth type. This value can be divided into the following three forms: isometric (b = 3), negative or minor allometric or hypo-allometric (b < 3), and positive or major allometric or hyper-allometric (b > 3) (Froese et al, 2011;Kumar et al, 2017;Asrial et al, 2021).…”

“…The length−weight relationship is a standard method that produces important biological information in fishery evaluations (Kuriakose, 2017). Nehemia et al (2012), Ujjania et al (2012), Safi et al (2014), Asrial et al (2021), andHamid et al (2015) have used this relationship to predict fish weight based on fish length. Fish weight can be calculated on the basis their length, and vice versa.…”

Biological aspects of bullet tuna (Auxis rochei Risso, 1810) landed in Towo’e Market Tahuna Indonesia

“…The biological aspects research of bullet tuna is very important considering the limited information on this fish species, especially in Sulawesi Sea waters. The biological aspects research of bullet tuna has been widely conducted in Indonesian waters, such as in Indian Ocean south of Java, Bali, and Nusa Tenggara [24][25][26][27], Indian Ocean west of Sumatra [9], [28][29], Banda Sea [18], Bone Bay [17], Majene waters [10], Makassar Strait [12], and Donggala waters [11]. But it has never been done in Sulawesi Sea waters.…”