Length–weight relationships of eleven mesopelagic fishes from oceanic islands of the Southwestern Tropical Atlantic

Eduardo, Leandro Nolé; Villarins, Bárbara T.; Frédou, Thierry; Lira, Alex Souza; Bertrand, Arnaud; Lucena‐Frédou, Flávia

doi:10.1111/jai.13840

Cited by 13 publications

(12 citation statements)

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“…Thus, estimated values can be used within the referred length range. These equation parameters are the reflection of not only local environmental variations, but also intrinsic characteristics and adaptative processes of each species like ontogenetic reproductive and variations between sexes (Froese, 2006; Eduardo et al, 2018a). Since fixation in formaldehyde and preservation in alcohol can affect length and weight measurements through the shrinking and dehydration of specimens, LWRs presented here may be slightly different than those found for fresh specimens.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, this parameter may be used for ecological modeling, infer body condition indices, and estimating fish growth patterns as a part of stock assessment and conservation strategies (Froese, 2006; Eduardo et al, 2018a). Nevertheless, available information on LWR of many mesopelagic species from the western Tropical Atlantic is still lacking (Catelani et al, 2017; Eduardo et al, 2018a, 2018b). In this study, we take advantage of a large‐scale deep‐sea expedition to provide new LWRs for twelve mesopelagic fish species.…”

Section: Introductionmentioning

confidence: 99%

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Length‐weight relationship of twelve mesopelagic fishes from the western Tropical Atlantic

et al. 2020

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Mesopelagic fishes (0-1,000 m depth) are major components of the oceans usually presenting global distribution, vertical migratory behavior, and a diverse array of morphological adaptations (Priede, 2017). These species are crucial for several ecosystem processes, such as carbon sequestration, nutrient regeneration, fisheries production, and waste absorption (Mengerink et al., 2014; Cavan et al., 2019; Eduardo et al., 2020). However, despite their importance, mesopelagic species remain mostly understudied and increasingly threatened by anthropogenic impacts (e.g. seabed mining, plastic pollution, ocean warming, and deoxygenation) (Steinberg et al., 2012; Mengerink et al., 2014; Levin & Bris, 2015). Given the difficulty of sampling in the deep-sea, even basic biological knowledge is lacking for many species, hampering the sustainable management of mesopelagic species as well as the comprehension of their numerous functions in the ecosystem (e.g. transport of carbon between oceanic layers). One of the key basic knowledge concerns the length-weight relationships (LWR), which is widely applied in the management of fish populations (Froese & Binohlan, 2000; Froese, 2006; Froese et al., 2011). For example, LWR is an effective approach for assessing fish biomass based on the conveniently obtained length data (Froese, 2006). Additionally, this parameter may be used for

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Length‐weight relationship of twelve mesopelagic fishes from the western Tropical Atlantic

et al. 2020

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“…In general, the parameters for LWRs differ among species due to multiple factors, including the fish body shape (Froese, 2006;Jellyman et al, 2013;Kulbicki et al, 2005;Schneider et al, 2000), whilst intraspecific differences may be due to gonad maturity, gender, diet, stomach fullness, health, preservation techniques, season and habitat (Beyer, 1987;Sakuma et al, 1999). Even the sampling protocols (e.g., fresh, frozen or preserved in solution) can lead to variations in LWR estimations (Eduardo et al, 2019). Some applications of LWRs include the ecosystemmodelling approach to obtain confident production-over-biomass estimates (Christensen & Pauly, 1992;Christensen & Walters, 2004;Pauly, 2000;Torres et al, 2012).…”

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confidence: 99%

Length–weight relationships of mesopelagic fishes from the equatorial and tropical Atlantic waters: influence of environment and body shape

López-Pérez

Olivar

Hulley

et al. 2020

Journal of Fish Biology

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Length-weight relationships (LWRs) were estimated for 36 mesopelagic fish species collected from the equatorial and tropical Atlantic encompassing several oceanographic regions: oligotrophic, equatorial, Cape Blanc, Cape Verde and the Canary Islands. The sample was composed of myctophids (25 species), gonostomatids (5), sternoptychids (3), stomiids (2) and phosichthyids (1). The species were clustered according to body shape: "short-deep" (sternoptychids), "elongate" (gonostomatids, stomiids and some phosichthyids) and "fusiform" (myctophids and some phosichthyids). Three types of weight and LWRs were considered: wet weight (WW), eviscerated wet weight (eWW) and eviscerated dry weight (eDW). The study demonstrated that most species present a positive allometric growth, independent of the weight used. However, the allometric value varied in 40-50% of species depending on the type of weight considered. Significant variations linked to fish morphology were found in the relationship between the slope and intercept of the LWR equation. Significant differences were also noted in the water content linked to fish body shape. Based on the distributions of several species we compare their fitness between oceanographic regions using the relative condition factor (K rel). Except for Diaphus brachycephalus (oligotrophic vs. equatorial waters) and Lampanyctus alatus (equatorial, Cape Blanc, Cape Verde and the Canary Islands), no regional significant differences were observed in the species analysed.

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“…To define the size range of mesopelagic fish, we used the minimum and maximum recorded sizes from three datasets of mesopelagic fish length-weight measurements (85)(86)(87). The combined datasets contained samples from the trophic and equatorial Atlantic as well as the Southern Ocean and gave a body size range of 0.01-500gm for mesopelagic fish.…”

Section: Mesopelagicsmentioning

confidence: 99%

The global ocean size-spectrum from bacteria to whales

Hatton

Heneghan

Bar-On

et al. 2021

Preprint

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It has long been hypothesized that aquatic biomass is evenly distributed among logarithmic body mass size-classes. Although this community structure has been observed locally among plankton groups, its generality has never been formally tested across all marine life, nor have its impacts by humans been broadly assessed. Here, we bring together data at the global scale to test the hypothesis from bacteria to whales. We find that biomass within most order of magnitude size-classes is indeed remarkably constant, near 1 Gt wet weight (10^15 grams), but that bacteria and whales are markedly above and below this value, respectively. Furthermore, human impacts have significantly truncated the upper one-third of the spectrum. Size-spectrum theory has yet to provide an explanation for what is possibly life's largest scale regularity.

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Length–weight relationships of eleven mesopelagic fishes from oceanic islands of the Southwestern Tropical Atlantic

Cited by 13 publications

References 10 publications

Length‐weight relationship of twelve mesopelagic fishes from the western Tropical Atlantic

Length‐weight relationship of twelve mesopelagic fishes from the western Tropical Atlantic

Length–weight relationships of mesopelagic fishes from the equatorial and tropical Atlantic waters: influence of environment and body shape

The global ocean size-spectrum from bacteria to whales

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