A comparison of length distributions of rockfishes (Sebastes spp.) from submersible and trawl surveys off central California

Watters, Diana L.; Dick, Edward J.

doi:10.7755/fb.116.3-4.7

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Growth increments were not validated during this study. However, these counts were assumed to correspond to daily ages because the formation of daily growth increments has been validated for several of these species, including S. jordani (Laidig et al, 1991), S. paucispinis , and S. goodei (Woodbury & Ralston, 1991).…”

Section: Methodsmentioning

confidence: 99%

Momma's larvae: Maternal oceanographic experience and larval size influence early survival of rockfishes

Fennie,

Ben‐Aderet,

Bograd

et al. 2023

Fisheries Oceanography

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Identifying factors that affect larval mortality is critical for understanding the drivers of fish population dynamics. Although larval fish mortality is high, small changes in mortality rates can lead to large changes in recruitment. Recent studies suggest maternal provisioning can dramatically affect the susceptibility of larvae to starvation and predation, the major sources of early‐life mortality. We measured otolith core width‐at‐extrusion and validated that this is a proxy for larval size‐at‐extrusion for eight species of rockfishes (genus Sebastes) to examine the influence of initial larval size on larval growth and survival and to understand how oceanographic conditions experienced by gestating females affect larval size (i.e., quality). Otolith core width‐at‐extrusion was significantly positively related to larval rockfish recent growth rate (5/7 species with sufficient sample size) and survival (all eight species). This suggests that individuals that are larger at extrusion generally grow faster and are more likely to survive early life stages. Otolith core width‐at‐extrusion was positively related to higher presence of Pacific Subarctic Upper Water and was negatively related to warmer, saline waters at the depths gestating mothers inhabited during the months prior to larval collection. In addition, otolith core width was larger further from fishing ports, possibly because these locations were historically less fished, contained more older, larger females, and/or had inherently better habitat quality (higher Pacific Subarctic Upper Water) than sites closer to shore. These results indicate that the environmental conditions female rockfish experience during gestation drive the size of the larvae they produce and impact larval growth and survival.

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Section: Methodsmentioning

confidence: 99%

Momma's larvae: Maternal oceanographic experience and larval size influence early survival of rockfishes

Fennie,

Ben‐Aderet,

Bograd

et al. 2023

Fisheries Oceanography

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show abstract

“…This is why hydrobiologists, as well as taxonomists and archaeologists, often rely on the shape and size of preserved or undigested otoliths to determine which species and sizes of fish were eaten by predators (Olsson and North, 1997). The relationships between the otolith and the fish have been studied by several authors (Echeveria, 1987;Campana et al, 1993;Aydin et al, 2004 andVeen et al, 2005). Also, some researchers have succeeded in measuring the duration of the reproductive cycle of fish (Seret and Opic, 2011) and calculating their age (Panfili et al, 1990) using the otolith.…”

Section: Introductionmentioning

confidence: 99%

Otolith morphology of six species of Cichlidae from Lake Buyo in the South-west of Côte d’Ivoire

2024

Int. J. Biosci.

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The morphology of otoliths is used as an indicator of various ecological processes or properties. So the present study was aimed to provide baseline data on the morphology of otoliths in six species of Cichlidae. A total of 179 individuals belonging to six species of the Cichlidae fished in Lake Buyo in June 2021 by artisanal fisheries. The sagitta of these species studied present common morphological characteristics. Indeed, they are elliptical in shape and robust with a concave internal face and a convex external face. However, there are a few differences that help distinguish each species. In the relationships between the total length of the fish and the length of the otolith, the values of the allometry coefficient "a" are between 0 and 1 (0 ˂ a ˂ 1) for all the species considered; they reflect a lowering allometry between the length of the fish and the length of the otolith. The values of the coefficient of determination are very high in Sarotherodon melanotheron (r2 = 0.8961), Oreochromis niloticus (r2 = 0.8469) and Coptodon zillii (r2 = 0.8403). These values reflect a strong correlation between the total length of the fish and the length of the otolith of each species. Our study, in the Ivorian or West African context, has the advantage of providing, on the one hand, morphological data on the otoliths of freshwater fish and, on the other hand, means of estimating the size of fish at from those of the otoliths.

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A comparison of length distributions of rockfishes (Sebastes spp.) from submersible and trawl surveys off central California

Cited by 2 publications

References 9 publications

Momma's larvae: Maternal oceanographic experience and larval size influence early survival of rockfishes

Momma's larvae: Maternal oceanographic experience and larval size influence early survival of rockfishes

Otolith morphology of six species of Cichlidae from Lake Buyo in the South-west of Côte d’Ivoire

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