Length–weight relationship of six notothenioid species from sub‐Antarctic waters (Beagle Channel, Argentina)

Abstract

This study presents length‐weight relationships (LWR) for six species of fishes of the Suborder Notothenioidei that inhabit the sub‐Antarctic waters of the Beagle Channel (Argentina). These species represent five of the nine families of this Suborder. The specimens belong to historical fish collections in the area (from 1987 to 1990) using gill and trammel nets. All species but Eleginops maclovinus had no previous LWR estimates. The coefficient of determination (r2) ranged from 0.91 to 0.99 and b values ranged from 2.74 to 3.2. Harpagifer bispinis was the only species with a b value lower than three. This information is useful to predict the weight from the length data and to provide insights into the ecology of sub‐Antarctic nototheniod fish.

First Insights Into the Growth and Population Structure of Cottoperca trigloides (Perciformes, Bovichtidae) From the Southwestern Atlantic Ocean

“…Cottoperca trigloides captured between 41 • and 54 • S of the southwestern Atlantic Ocean, with sizes ranging from 8.4 to 51.5 cm TL, belonged to 8-year classes, and 92.8% of them were juveniles. In this regard, Lobao-Tello and Hüne (2012) mentioned that C. trigloides less than 55 cm TL are the most frequent individuals in wild populations, in agreement with the size range registered by Vanella et al (2007) and Fernández et al (2012Fernández et al ( , 2018. The lack of older fish in the capture restricted the ages to a narrow range that is functionally linear and makes it difficult to fit a non-linear function, especially those with a horizontal asymptote.…”

“…Additionally, studies performed in the Beagle Channel indicated that C. trigloides lives in association with the holdfast of Macrocystis pyrifera kelp forest (Vanella et al, 2007), in accordance with their low buoyancy (Fernández et al, 2012). In those ecosystems, Fernández et al (2018) described an isometric growth for the species, without intersex differences in the slope for the length-weight relationships. Moreover, Fernández et al (2009) determined the energy content of C. trigloides, obtaining the lowest value (21.82 kJ g −1 dry weight) among different notothenioid species.…”

Assemblage structure and spatial diversity patterns of kelp forest-associated fishes in Southern Patagonia

“…Biomass of individual fishes was estimated using the allometric length-weight conversion: W = aTL b , where parameters a and b are species-specific constants, TL is total length in cm, and W is weight in grams. Length-weight fitting parameters were obtained from FishBase [ 39 ] and for notothenioid species from Fernández et al [ 40 ]. Salinity and temperature were recorded using a YSI model 556 handheld multiparameter instrument at KNP and an RBR Concerto multi-channel logger at CH and DR. For MP and IE, salinity and temperature measurements were obtained close to the sampling areas during February of 2015 and April of 2017, at 10 m depth [ 41 , 42 ].…”

Ocean acidification and seasonal temperature extremes combine to impair the thermal physiology of a sub-Antarctic fish

“…The Beagle Channel is a unique subpolar marine ecosystem located in the southern extreme of South America, connecting the Pacific and the Atlantic Oceans (Flores Melo et al, 2020). Due to its location, this area hosts a mixture of marine ichthyofauna with different origins that have experienced distinct evolutionary histories (Fernández et al, 2019). Fishes of the suborder Notothenioidei are the most dominant component of the ichthyofauna in the Beagle Channel (Lloris and Rucabado, 1991;Vanella et al, 2007).…”