Quantifying aquaculture-derived organic matter in the sediment in and around a coastal fish farm using stable carbon and nitrogen isotope ratios

Yokoyama, Hisashi; Abo, Katsuyuki; Ishihi, Yuka

doi:10.1016/j.aquaculture.2005.10.024

Cited by 123 publications

(92 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For example, the incidental source of organic enrichment below bivalve culture apparatus has been recognized as important in a review of ecosystem effects of bivalve culture by the US National Academy of Sciences (Ocean Studies Board 2010). Gaertner-Mazouni et al (2012) estimated the sediment flux in Ahe Atoll lagoon (French Polynesia) using a sediment trap, and found that the sedimentation rates beneath the pearl oyster culture can be 5 times higher than in the control zone, and the percentage of small particles (≤63 µm) was about double, although the impact of pearl farming is generally much lower than fish or other bivalve farming (Gifford et al 2004, Yokoyama et al 2006, André-fouët et al 2012.…”

Section: Changes In Grain Size In Response To Pearl Farmingmentioning

confidence: 99%

Paleo-ecological analyses to assess long-term environmental effects of pearl farming in Western Australia

Chen¹,

Peng²,

Keesing³

et al. 2016

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Small environmental disturbances accumulating over a long period of time may cause a regime shift in marine ecosystems, particularly in sensitive oligotrophic waters. Pearl oyster aquaculture, which has a 50 yr history in Australia, has been regarded as an anthropogenic activity with low environmental risk. To assess the long-term environmental effects of pearl oyster farming, sediment cores taken in Cygnet Bay, Western Australia, were used to reconstruct environmental processes covering an approximately 90 yr period. Biogeochemical parameters in sediment cores from inside and outside a pearl farming area displayed contrasting characteristics over time. Total organic carbon, total nitrogen, biogenic silica (BSi), and fine-grained sediment at the farming site displayed significant increases with the expansion of oyster stocking. In contrast, only small variations in response to climatic signals (rainfall and temperature) occurred over time in the cores outside the farm. The variation in the C:N ratio, δ 13 C and δ 15 N ranges over time suggested that increased organic matter was mainly contributed by autochthonous sources rather than terrestrial input. The sequential t-test for a regime shift detected approximately 2-to 3-fold increases in organic matter, 1-to 5-fold increases in silt proportion and 2-to 5-fold increases in BSi concentrations after pearl oyster farming, in contrast to the control site. The rapid development of modern long-line culture since the late 1980s is presumed to have been the dominant driver of environmental changes in sediments. The results provide insight into the magnitude of environmental change which can occur over decades as a result of even minimal anthropogenic activity.

show abstract

Section: Changes In Grain Size In Response To Pearl Farmingmentioning

confidence: 99%

Paleo-ecological analyses to assess long-term environmental effects of pearl farming in Western Australia

Chen¹,

Peng²,

Keesing³

et al. 2016

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…In aquaculture pond systems, which represent semi-controlled aquatic mesocosms, both measurements of stable isotopes at natural abundance levels and isotopically-enriched nutritional substrates have been used to assess the sources and sinks for dietary carbon and nitrogen (Schroeder, 1983;Bombeo-Tuburan, et al, 1993;Nunes et al, 1997;Epp et al, 2002;Burford et al, 2004aBurford et al, , 2004b. Such studies have determined, for example, the flow of nutrients from feeds into sediments (Yokoyama et al, 2006), from feeds to microbial flocs (Burford et al, 2002), and the relative contribution of formulated feeds and natural productivity to tissue growth (Parker et al, 1989). In laboratory studies, the use and application of stable isotopes allows the direct determination of ingestion and assimilation rates, with straightforward collection techniques and rapid, accurate, sample analysis (Michener and Schell, 1994;Dittel et al, 1997;Verschoor et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Naturally-occurring stable isotopes as direct measures of larval feeding efficiency, nutrient incorporation and turnover

Vay

Gamboa‐Delgado

2011

Aquaculture

View full text Add to dashboard Cite

Stable isotopes are non-hazardous markers that have been widely-used in assessing energy flow within aquatic ecosystems. Hatchery systems are also highly amenable to this approach, as they represent controlled mesocosms with a limited number of food sources and short planktonic food chains with rapid and measurable bioaccumulation of the heavier stable isotopes of carbon and nitrogen at each trophic step. Differences in the natural isotopic composition of dietary components may be used to provide direct integrated measures of ingestion, nutrient incorporation and growth through development under normal feeding and environmental conditions, in either the laboratory or the hatchery. Simple isotopic mixing models allow estimation of relative utilisation of inert diets and live feeds, and individual components of compound feeds. Such experiments have investigated the effectiveness of cofeeding regimes, optimal timing of live food transitions (eg from rotifers to Artemia), presentation of inert diets, optimal size/age for weaning and incorporation of specific dietary components. Furthermore, time-series measurement of changes in tissue isotopic signature (δ 15 N, δ 13 C) enables modelling of growth dilution and tissue turnover components of isotopic change driven by nutritional sources. These measures need to take into account the difference in isotope values that is typically observed between the diet and consumer (isotopic discrimination factor, ∆). In marine larvae and early post-larvae, ∆ 13 C and ∆ 15 N have been found to range widely, from 0.4-4.1‰ and 0.1-5.3‰ respectively. The observation of such a high level of variation within species and life stages indicates a strong effect of diet quality on isotopic discrimination. Elucidating mechanisms underlying such observations, and much greater resolution in larval nutritional studies, can be achieved by application of rapidlydeveloping techniques for compound specific stable isotope analysis in tracing the transfer of dietary sources of carbon and nitrogen into tissue components. Fast growing aquatic larvae represent excellent model organisms exhibiting rapid transitions in isotopic composition in 3 response to diet, rapidly changing feeding behaviour and transitions in trophic level with ready ingestion of modifiable experimental diets in short and controlled food chains. Thus results of studies of the effects of diet composition, developmental stage, growth rates or environmental conditions on stable isotope incorporation will be of broad relevance not only in terms of larval nutrition but can also more broadly inform the design and interpretation of ecological studies.

show abstract

“…N concentrations in trap contents, can verify the extent and severity of deposition footprints from fish farms (Sarà et al 2004, Yokoyama et al 2006, Holmer et al 2007. It is possible that this technique could help to distinguish fish feed and faeces from biofouling organisms if these are sufficiently different in stable isotope profile.…”

mentioning

confidence: 99%

MERAMOD: predicting the deposition and benthic impact of aquaculture in the eastern Mediterranean Sea

Cromey¹,

Thetmeyer²,

Lampadariou³

et al. 2012

Aquacult. Environ. Interact.

View full text Add to dashboard Cite

A model composed of coupled particle tracking and benthic response modules was developed for predicting waste solids flux and benthic impacts of gilthead sea bream Sparus aurata L. and sea bass Dicentrarchus labrax L. aquaculture. The model was tested at 6 sites with different hydrodynamics, bathymetries and biomasses in the Aegean and Ionian seas, eastern Mediterranean Sea, and sediment trap flux and benthic impact indicators were observed. Seven sediment trap validation studies were conducted that varied in design with traps deployed either on the seabed, attached to nets or suspended in the water column. Model predictions of flux to traps spaced 5 m apart up to 50 m from the cages over a 13 d period were significant (R 2 = 0.61, n = 57, p ≤ 0.05). However, the model could not predict adequately the flux to traps spaced 2 m apart in the high-flux zone underneath cages where variability between trap observations was high. In this high-flux zone underneath cages, the averaged model flux predictions resulted in a performance of ± 49%. Statistically significant relationships were established at 4 sites between modelled flux and either benthic fauna impact indicator species (S), abundance (A), A/S ratio, Shannon-Wiener index or biomass fractionation index (BFI), (R 2 = 0.82, 0.60, 0.57, 0.67 and 0.48, respectively; n = 24, p ≤ 0.05). Two other sites, which did not exhibit an abundance peak in enriched zones, did not fit these relationships. Using relative abundance of taxonomic groups, a modelled flux of 4.1 g m −2 d −1 was determined to be a useful boundary; on either side of this boundary, clear trends occurred in pollutant tolerant and intolerant species.

show abstract

Quantifying aquaculture-derived organic matter in the sediment in and around a coastal fish farm using stable carbon and nitrogen isotope ratios

Cited by 123 publications

References 36 publications

Paleo-ecological analyses to assess long-term environmental effects of pearl farming in Western Australia

Paleo-ecological analyses to assess long-term environmental effects of pearl farming in Western Australia

Naturally-occurring stable isotopes as direct measures of larval feeding efficiency, nutrient incorporation and turnover

MERAMOD: predicting the deposition and benthic impact of aquaculture in the eastern Mediterranean Sea

Contact Info

Product

Resources

About