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80 results for “fish length”
Fig. 2 in Length-Weight Relationships And Condition Factors Of The Naleh Fish Barbonymus Gonionotus (Pisces, Cyprinidae) Harvested From Nagan Raya Waters, Indonesia
Fig. 2. Map of Nagan Raya District, Aceh Province showing location sampling (black dots).
Fig. 1 in Length-Weight Relationships And Condition Factors Of The Naleh Fish Barbonymus Gonionotus (Pisces, Cyprinidae) Harvested From Nagan Raya Waters, Indonesia
Fig. 1. Fresh sample of naleh FIsh Barbonymus gonionotus.
Fig. 2 in Relationship between fish length and otolith dimensions of Yellow striped goatfish, Upeneus vittatus (Forsskal, 1775) along the Indian coast
Fig. 2 — Photograph of U. vittatus
Fig. 1 in Relationship between fish length and otolith dimensions of Yellow striped goatfish, Upeneus vittatus (Forsskal, 1775) along the Indian coast
Fig. 1 — Map showing the sampling locations of U. vittatus along the Indian coast.
Figure. Map of Turkey showing the sampling sites in the Black Sea. in Length-weight relationships of 28 fish species caught from demersal trawl survey in the Middle Black Sea, Turkey
Figure. Map of Turkey showing the sampling sites in the Black Sea.
Fig. 1 in Total mercury in the fish Trichiurus lepturus from a tropical estuary in relation to length, weight, and season
Fig. 1. Location and details of the study area, Goiana Estuary at the Brazilian Northeast.
Figure. Map of the study area. in Length-weight relationships of 14 fish species from the Gulf of Antalya (northeastern Mediterranean Sea, Turkey)
Figure. Map of the study area.
Figure. Study area. in Length-weight relationships of 22 fish species from the Gallipoli Peninsula and Dardanelles (northeastern Mediterranean, Turkey)
Figure. Study area.
Figure. Sampling stations (BS: beach seine, BT: beam trawl). in Length-weight relationships of forty-nine fish species from shallow waters of Gökçeada Island, northern Aegean Sea
Figure. Sampling stations (BS: beach seine, BT: beam trawl).
Figure. Study area (the Sea of Marmara, Türkiye) and the sampling stations. in The length-weight relationship and condition factors of coastal small-sized adult and juvenile fish species following dense mucilage in the Sea of Marmara, Türkiye
Figure. Study area (the Sea of Marmara, Türkiye) and the sampling stations.
Data From: Shortened food chain length in a fished versus unfished coral reef
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Delta Smelt Formalin Fixation and Preservation Effects on Fish Weight and Length
Natural history museum specimen are invaluable for a variety of conservation and ecological applications. Fishes are commonly preserved in formalin; however, formalin preservation is associated with reduced fish length and increased weight, but the magnitude and timing of these changes may vary among species. Unaccounted for preservation-driven shifts in fish length and weight may have drastic effects on any conservation or ecological conclusions drawn from specimen preserved for various durations as well as when compared to fresh, unpreserved specimen. The purpose of this study was to test whether formalin fixation and preservation affects endangered Delta Smelt, Hypomesus transpacificus, lengths and weights with implications for the use of data collected on preserved and fresh specimen. Fresh Delta Smelt were lengthed and weighted, then fixed and preserved in 10% buffered formalin. Repeated measures of specimen length and weight were recorded weekly for 4 weeks, fortnightly from preservation week 4 through preservation week 24, and then approximately annually through 6 total years of preservation.
Data from: Fishing-induced changes in adult length are mediated by skipped-spawning
Elucidating fishing effects on fish population dynamics is a critical step toward sustainable fisheries management. Despite previous studies that have suggested age or size truncation in exploited fish populations, other aspects of fishing effects on population demography, e.g., via altering life histories and density, have received less attention. Here, we investigated the fishing effects altering adult demography via shifting reproductive trade-offs in the iconic, overexploited, Pacific bluefin tuna Thunnus orientalis. We found that, contrary to our expectation, mean lengths of catch increased over time in longline fisheries. On the other hand, mean catch lengths for purse seine fisheries did not show such increasing trends. We hypothesized that the size-dependent energetic cost of the spawning migration and elevated fishing mortality on the spawning grounds potentially drive size-dependent skipped spawning for adult tuna, mediating the observed changes in the catch lengths. Using eco-genetic individual-based modeling, we demonstrated that fishing-induced evolution of skipped spawning and size truncation interacted to shape the observed temporal changes in mean catch lengths for tuna. Skipped spawning of the small adults led to increased mean catch lengths for the longline fisheries, while truncation of small adults by the purse seines could offset such a pattern. Our results highlight the eco-evolutionary dynamics of fishing effects on population demography and caution against using demographic traits as a basis for fisheries management of the Pacific bluefin tuna as well as other migratory species.
Data from: Is telomere length a molecular marker of past thermal stress in wild fish?
Telomeres protect eukaryotic chromosomes; variation in telomere length has been linked (primarily in homoeothermic animals) to variation in stress, cellular ageing and disease risk. Moreover, telomeres have been suggested to function as biomarker for quantifying past environmental stress, but studies in wild animals remain rare. Environmental stress, such as extreme environmental temperatures in poikilothermic animals, may result in oxidative stress that accelerates telomere attrition. However, growth, which may depend on temperature, can also contribute to telomere attrition. To test for associations between multitissue telomere length and past water temperature while accounting for the previous individual growth, we used quantitative PCR to analyse samples from 112 young-of-the-year brown trout from 10 natural rivers with average water temperature differences of up to 6°C (and an absolute maximum of 23°C). We found negative associations between relative telomere length (RTL) and both average river temperature and individual body size. We found no indication of RTL–temperature association differences among six tissues, but we did find indications for differences among the tissues for associations between RTL and body size; size trends, albeit nonsignificant in their differences, were strongest in muscle and weakest in fin. Although causal relationships among temperature, growth, oxidative stress, and cross-sectional telomere length remain largely unknown, our results indicate that telomere-length variation in a poikilothermic wild animal is associated with both past temperature and growth.
Weight and length measurements for 37 Mekong River fish species of the 'Dai' fishery
<p>The Lower Mekong Basin supports some of the world's largest and most diverse inland fisheries by supplying nutrition to over 60 million people and an estimated 11 billion USD of economic activity each year. Despite the nutritional and economic importance of the fishery, there are limited data available on which fishery officers and managers can build fishery stock management plans. Traditional fishery stock management relies on models of individual and population growth that in turn rely on robust individual-based data sets, preferably collected over long time scales. One such fishery for which there are robust data sets are for the "dai," or bagnet, fishery located on the Tonle Sap River that connects the Mekong River mainstream with the Tonle Sap Lake. However, datasets from the dai fishery are not publicly available, limiting their utility for understanding how catches in this fishery have changed over time. Several papers have utilized the data from the dai fishery, but none have made the data publicly available. By partnering with commercial fishers who participate in the dai fishery and in partnership with the Cambodian Department of Fisheries and the Inland Fisheries Research and Development Institute we collected weight and length data bi-monthly for fish captured at two dai operations starting in November 2020 and continuing to February 2021, totaling 32,274 measurements of length and weight for 37 species. Here we report weight and length data for individuals captured during this timeframe as well as calculated weight-length relationships for total length and standard length for all 37 species for which there were ³30 measurements. Plots of all weight-length regressions are also included in the data package. Finally, we report equations for converting standard length measurements to total length estimates and vice versa.</p>
Data for: Warming temperatures limit the maximum body length of teleost fishes across a latitudinal gradient in Norwegian waters
<p>As the majority of marine organisms are water-breathing ectotherms, temperature and dissolved oxygen are key environmental variables that influence their fitness and geographic distribution. In line with the gill-oxygen limitation theory (GOLT), the maximum asymptotic body size of water-breathing ectotherms is limited by an insufficient amount of oxygen that is supplied to meet metabolic demand once a threshold of gill surface area to body weight ratio is surpassed. Here we employed generalised additive models (GAMs) to investigate the relative influence of temperature, regional variation in dissolved oxygen, and geographic location (that encompasses multiple latent variables) on the maximum body length of ten teleost fish species, as well to predict their maximum body length, across a large temperature, depth and latitudinal gradient throughout Norwegian waters. As dissolved oxygen levels were near saturation across the study area, we conclude that the predicted maximum lengths of our study species were not limited by oxygen availability. Conversely, the majority of study species display a clear relationship in that their predicted maximum length is either decreasing, asymptotic or parabolic across their observed temperature range. We also observed smaller maximum body lengths for multiple species within the coldest extent of their temperature range, which may be explained by increases in basal metabolism via cold denaturation. Overall, our results suggest that the maximum lengths of our study species are influenced by temperature, thus supporting the tenants of the GOLT.</p>
Data from: Ontogenetic development of intestinal length and relationships to diet in an Australasian fish family (Terapontidae)
Background: One of the most widely accepted ecomorphological relationships in vertebrates is the negative correlation between intestinal length and proportion of animal prey in diet. While many fish groups exhibit this general pattern, other clades demonstrate minimal, and in some cases contrasting, associations between diet and intestinal length. Moreover, this relationship and its evolutionary derivation have received little attention from a phylogenetic perspective. This study documents the phylogenetic development of intestinal length variability, and resultant correlation with dietary habits, within a molecular phylogeny of 28 species of terapontid fishes. The Terapontidae (grunters), an ancestrally euryhaline-marine group, is the most trophically diverse of Australia's freshwater fish families, with widespread shifts away from animal-prey-dominated diets occurring since their invasion of fresh waters. Results: Description of ontogenetic development of intestinal complexity of terapontid fishes, in combination with ancestral character state reconstruction, demonstrated that complex intestinal looping (convolution) has evolved independently on multiple occasions within the family. This modification of ontogenetic development drives much of the associated interspecific variability in intestinal length evident in terapontids. Phylogenetically informed comparative analyses (phylogenetic independent contrasts) showed that the interspecific differences in intestinal length resulting from these ontogenetic developmental mechanisms explained ~65% of the variability in the proportion of animal material in terapontid diets. Conclusions: The ontogenetic development of intestinal complexity appears to represent an important functional innovation underlying the extensive trophic differentiation seen in Australia's freshwater terapontids, specifically facilitating the pronounced shifts away from carnivorous (including invertebrates and vertebrates) diets evident across the family. The capacity to modify intestinal morphology and physiology may also be an important facilitator of trophic diversification during other phyletic radiations.
Figure 4. Regression lines between average length and sampling depth for the 19 in Bathymetric trends in distribution and size of demersal fish species in the north Aegean Sea
Figure 4. Regression lines between average length and sampling depth for the 19 species with significant size-depth relationships.
Data from: Fishing-induced changes in adult length are mediated by skipped-spawning
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Data from: Is telomere length a molecular marker of past thermal stress in wild fish?
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