Ambient temperature influences adult size and life span in jumbo squid (Dosidicus gigas)

Abstract

17The eastern Pacific jumbo squid Dosidicus gigas is one of the largest and most abundant 18 squid of the world ocean. To reveal possible interannual variability in the life span, statoliths 19were aged from mature females belonging to two modal size groups (<490 cm and >500 mm of 20 mantle length) collected before (1991-1996), during (1997-1998) and after (1999-2011) strong 21El Niño event in Peruvian waters. We have demonstrated that water temperatures encountered 22 between 3 rd and 6 th months of ontogenesis had the strongest negative effect on age. Together 23 with weaker but significant negative effect coming from temperatures encountered during early 24 life (1 st -3 rd months) and later ontogenesis (7 th and 8 th months), these temperature parameters 25 (together with other environmental factors) were important to determine whether a given animal 26 has a 1 year life cycle (matures early and attains small sizes), or 1.5-2 year life cycle (delayed 27 maturation and large size). Possible cause of a sudden increase in abundance of the large group 28 of D. gigas in 2000-2001 is discussed. 29 30

Age, growth, and population structure of the red flying squid (Ommastrephes bartramii) in the North Pacific Ocean, determined from beak microstructure

“…5). There are 2 potential reasons for this difference: 1) the female squids in this study belonged to the group of small-size females in the northwestern stock (Chen and Chiu, 2003), a group that tends to have a low growth rate than that of the squid used in the other 2 studies, especially in the study by Yatsu et al (1997), whose samples may have belonged to large-size females of that stock, and 2) the size and life span of squid can be influenced by ambient temperature, an influence that is more obvious in extreme weather (e.g., El Ninõ or La Ninã), as has been documented for the jumbo squid (Dosidicus gigas) (Arkhipkin et al, 2015).…”

'Superbull' males: what role do they play and what drives their appearance within the Doryteuthis gahi Patagonian Shelf population?

“…In other species, anomalously large individuals have delayed maturation and an extended life cycle. For example, in the eastern Pacific, temperature determines whether jumbo squid Dosidicus gigas have a 1-year life cycle (early maturation and a small size) or a 1.5-to 2-year life cycle (delayed maturation and a large size; Arkhipkin et al 2015b). If this is the case for D. gahi, these individuals may also potentially maintain temporal connectivity by reproducing with the following spawning cohort.…”

Physicochemical and sensory properties of yogurt as affected by the incorporation of jumbo squid (Dosidicus gigas) powder

“…Jumbo squid (Dosidicus gigas) is a hydro-biological resource abundant in the Peruvian sea which is, at present, directly consumed by the population (Alegre et al, 2014;Arkhipkin, Argüelles, Shcherbich, & Yamashiro, 2014). As a commercial activity, the Peruvian fishing industry has undergone periods of crisis, which have had as main causes the overexploitation of this resource, underpinned by the lack of innovative competitiveness of companies in both the fishing and food industry sectors (Liu et al, 2013).…”