This paper describes the weight–length relationships (WLRs) and Fulton’s condition factors (K) of skipjack tuna (Katsuwonus pelamis) in purse seine fisheries from three cruises in the western and central Pacific Ocean (WCPO): (ND12), and (JJ13). The fork length and weight of a total of 1678 specimens were measured. The results showed that the fork length of more than 70% of specimens was below 60 cm (76% in AS09, 87% in ND12, and 73% in JJ13). The coefficient b in the combined sex group was 3.367, 3.300 and 3.234 in JJ13, AS09 and ND12, respectively. The b values of WLRs when fork length was >60 cm were significantly less than 3 (P = 0.062), but when fork length was <60 cm they were significantly greater than 3 (P = 0.028). The K value ranges of JJ13, AS09 and ND12 in different fork length groups were 1.3–1.84 (1.62 ± 0.18), 1.57–2.02 (1.86 ± 0.15), and 1.44–1.78 (0.65 ± 0.13), respectively. Moreover, K aplicaciones de citas barba reddit values in different fork length classes for each cruise had one turning point: 60–65 cm for JJ13; 60–65 cm for ND12; and 55–60 cm for AS09. The results of this study provide basic information on the WLRs and K values of skipjack tuna in different seasons and growth phases in the WCPO, which are useful for fishery biologists and fishery managers.

Addition

Skipjack tuna (Katsuwonus pelamis) try a great pelagic, higher yields species that have a max many years less than 4.five years (Fromentin Fonteneau, 2001). Due to the fact an essential industrial species, it is generally caught within the tropical and you can subtropical seas of your own Pacific, Atlantic, and Indian seas. Grabs away from skipjack tuna happened to be over 70% of all tuna captures in the western and you will main Pacific Ocean (WCPO), where 1 / 2 of the new world’s tuna try stuck (Food and Agricultural Business of your own United nations, 2011). In the WCPO, 86% of skipjack tuna try c). While in the fishery circumstances, some elementary biological parameters (e.grams., dimensions, weight) are very important to possess researching fishery durability in order to determine brings (Fromentin Fonteneau, 2001; Hampton, 2000).

Weight–size relationships and you will Fulton’s status things from skipjack tuna (Katsuwonus pelamis) on the west and main Pacific Water

The weight–length relationships (WLR) and you may Fulton’s condition basis (K) are two fundamental parameters used in fishery research, and now have come closely associated since they have been earliest advised (Froese, 2006). The WRL ‘s the relationships ranging from pounds and you can size for a given types, and can be employed to imagine the growth development. Previous studies have believed the new WLRs of skipjack tuna from the CPWO (Crazy Hampton, 1993; Sunshine Yeh, 2002; Sunshine mais aussi al., 2003; Froese Pauly, 2014); yet not, it mostly dedicated to the fresh WLR of all skipjack tuna specimens trapped. Therefore, what included in various other ages/human body classes was not obviously understood. Additionally, centered on a current WCPO skipjack tuna updates statement (Harley mais aussi al., 2011), quick fish (40–60 cm; 1–2 years) ruled catches, except in the 2005. But not, little is now identified in regards to the differences when considering biological details during different development stages. Dilemma eters of one’s WLR) were used examine the distinctions one of several some other amounts of 1 observance, and various inside situ observations; especially, just like the a degree can impact b philosophy, and higher b values try regarding the quicker an amounts (Froese, 2006). The value of K is determined from the lbs and you may size, and certainly will be employed to guess alterations in nutritional reputation. Partners studies in recent years enjoys checked-out this new K worth having skipjack tuna. Past research has shown the K opinions for other seafood alter seasonally (see Froese, 2006 and you can sources therein) with gains phase. Skipjack tuna are known to feel strongly influenced by macro-aquatic standards, e.g., El Nino and La Nina (Lehodey mais aussi al., 1997; Lehodey mais aussi al., 2013; Loukos mais aussi al., 2003); however, a similar transform as with almost every other fish variety just weren’t stated getting skipjack tuna. Even in the event both the WLR and you can K can also be echo the growth standards of particular seafood, zero studies you to combine research of these two indicator have been advertised. For this reason, it stays not sure whether they possess uniform trend you to reflect the fresh population functions of skipjack tuna on the WCPO.