The Morphoedaphic Index, a Fish Yield Estimator — Review and Evaluation

1974 ◽  
Vol 31 (5) ◽  
pp. 663-688 ◽  
Author(s):  
R. A. Ryder ◽  
S. R. Kerr ◽  
K. H. Loftus ◽  
H. A. Regier
Keyword(s):  
Ecological Theory ◽  
Total Dissolved Solids ◽  
Future Application ◽  
Commercial Fish ◽  
Fish Yield ◽  
Climatic Regions ◽  
Changing Environments ◽  
Morphoedaphic Index ◽  
North Temperate Lakes ◽  
Fish Yields

The morphoedaphic index (MEI), a fish yield estimator, was historically reviewed and evaluated. Background papers leading to the development of the MEI were discussed, as well as more recent advances. The MEI was defined and its criteria for use examined. The significance of its components — total dissolved solids and mean depth — were explained. The MEI was compared with related models developed by other workers. The global range of the MEI was outlined as well as restrictions on its use. Sustained fish yields at different MEI values for various climatic regions were predicted. Several special applications of the MEI were described, including: prediction of angling yield in north-temperate lakes; prediction of commercial fish yield on a newly created reservoir; indicator of ecological stresses and changing environments; and contrasting responses to cultural eutrophication in the littoral and profundal zones of lakes. The implications of the MEI for ecological theory were explored, and its potential for future application in management was outlined.

Measures of Optimal Thermal Habitat and Their Relationship to Yields for Four Commercial Fish Species

1988 ◽  
Vol 45 (2) ◽  
pp. 301-314 ◽  
Author(s):  
Gavin C. Christie ◽  
Henry A. Regier
Keyword(s):  
Lake Trout ◽  
Regression Equations ◽  
Lake Area ◽  
Important Species ◽  
Commercial Fish ◽  
Thermal Habitat ◽  
Lake Bottom ◽  
Morphoedaphic Index ◽  
North Temperate Lakes ◽  
Species Specific

Measures of thermal habitat space were developed by integrating, over time during the summer period, the amount of lake bottom area and pelagic volume with water temperatures within species' optimal thermal niches. These species' specific measures, thermal habitat area, THA (hectares per 10 d), and thermal habitat volume, THV (cubic hectometres per 10 d), were used as predictor variables in regression equations estimating the total sustained yield, SY (kilograms per year), of each of four commercially important species: lake trout, Salvelinus namaycush; lake whitefish, Coregonus Clupeaformis; walleye, Stizostedion vitreum vitreum; and northern pike, Esox lucius. One or both of THA and THV were strongly correlated with SY for each of the four species for a set of 21 large north-temperate lakes. Several other habitat variables were assessed with respect to species' SY: total lake area and volume, mean depth, total dissolved solids, and the ratio of the latter two as R. A. Ryder's morphoedaphic index. The various statistical results are interpreted with respect to the ecology of the four species.

Total Dissolved Solids as a Predictor of Lake Biomass and Productivity

1983 ◽  
Vol 40 (1) ◽  
pp. 92-95 ◽  
Author(s):  
E. E. Prepas
Keyword(s):  
Chlorophyll A ◽  
Significant Relationship ◽  
Positive Relationship ◽  
Biomass Productivity ◽  
Total Dissolved Solids ◽  
Fish Production ◽  
Dissolved Solids ◽  
Significant Positive Relationship ◽  
Morphoedaphic Index ◽  
Shield Lakes

Total dissolved solids (TDS) and chlorophyll a were not related in 25 lakes which were all off the Precambrian Shield. Both on-shield and off-shield lakes were included in the previous reports which showed a significant relationship between TDS and productivity. When data from on-shield and off-shield lakes were analyzed separately, there was no significant positive relationship between TDS and lake biomass or productivity. It was also shown that mean depth ([Formula: see text]) was as good a predictor of fish production as the TDS: [Formula: see text] ratio, the morphoedaphic index.Key words: TDS, biomass, productivity, morphoedaphic index, chlorophyll a, lakes

Relationships of Fish Yield to Lake Phytoplankton Standing Crop, Production, and Morphoedaphic Factors

1977 ◽  
Vol 34 (12) ◽  
pp. 2271-2279 ◽  
Author(s):  
Ray T. Oglesby
Keyword(s):  
Primary Production ◽  
Standing Crop ◽  
Crop Production ◽  
Fishery Management ◽  
Cold Water ◽  
Phytoplankton Production ◽  
Fish Yield ◽  
Morphoedaphic Index ◽  
Intensively Managed ◽  
Predicted Values

Fish yield is related to annual primary production, summer phytoplankton standing crop, and the morphoedaphic index for lakes representing a wide variety of typologies by a series of models in the form of log-log regressions. Tentative boundary conditions are established by which lakes inappropriate to the models can be excluded. Confidence intervals for predicted values about the mean are given for the fish yield–phytoplankton standing crop regression. From this relation, potential yields for the lakes studied are reduced from a range of 10,000 to one of 25-fold. Efficiencies with which carbon is transferred from primary production to fish yield vary by 2 to 3 orders of magnitude and are highest for small, intensively managed ponds and lowest for large, deep, cold-water lakes. Models based upon fish yield as a function of phytoplankton production or standing crop are inherently more accurate and subject to fewer exceptions than are those related to morphoedaphic factors. The former appear to be capable of substantial refinement but even in their present state might be employed to make useful predictions for groups of lakes. A suggested supplement to existing approaches in fishery management involves the following sequence: (1) use of expectation-variability diagrams to obtain an overview of the problem, (2) selection of an appropriate model or models to predict yield, (3) prediction of a range of yields, and (4) implementation of regulations proved successful for other lakes in the same yield category. Key words: fish, lakes, phytoplankton, morphoedaphic index, fishery management

Yield Properties and Structure of Boreal Percid Communities in Ontario

1977 ◽  
Vol 34 (10) ◽  
pp. 1613-1625 ◽  
Author(s):  
G. F. Adams ◽  
C. H. Olver
Keyword(s):  
Total Yield ◽  
Fishing Effort ◽  
Productive Capacity ◽  
Lake Productivity ◽  
Net Community Production ◽  
Yield Data ◽  
Northern Ontario ◽  
Fish Yield ◽  
Theoretical Yield ◽  
Morphoedaphic Index

A synoptic review of yield data for 70 northern Ontario lakes from 1917 to 1973 showed that percids mainly walleye (Stizostedion vitreum vitreum) constituted about one-third, by weight, of the total fish yield. This relationship, which was independent of fishing effort, lake size, and lake productivity, is considered to be an emergent property of this type of fish community and represents a degree of homeostasis within the community under exploitation. The relation of percid yield to theoretical yield (based on the morphoedaphic index — MEI) reflected organizational structure and suggested the existence of a community (percid) component within the MEI, and from this we recommend upper limits of percid harvest for boreal percid lakes.Most (83%) of the 70 lakes had an average total yield of less than 2.5 kg∙ha−1∙yr−1, 53% (37 lakes) yielding less than one-half of the theoretical yield (average 3.4 kg∙ha−1∙yr−1). Long-term average yields exceeded the theoretical maximums in only 11 lakes. Mesotrophic to slightly eutrophic waters appeared as optimum for percid yields.Inferences from the data suggest an unexploited boreal percid community is characterized by high community stability and low net community production with resiliency low because of the low productive capacity of the waters. A yield index (RYI), which was assumed to reflect both effort and vulnerability to exploitation, showed that fishing intensity tended to be higher on the smaller, less productive lakes in this study. Key words: Percidae, Stizostedion, community ecology, yield properties, management implications

scholarly journals KEBIJAKAN PEMACUAN SUMBERDAYA IKAN DI PERAIRAN UMUM DARATAN INDONESIA: TEKNOLOGI ALTERNATIF UNTUK MENINGKATKAN PRODUKSI IKAN DAN PENDAPATAN NELAYAN

2017 ◽  
Vol 1 (2) ◽  
pp. 99
Author(s):  
Endi Setiadi Kartamihardja ◽  
Chairulwan Umar
Keyword(s):  
Code Of Conduct ◽  
Monitoring And Evaluation ◽  
Future Application ◽  
Optimum Number ◽  
Potential Yield ◽  
Fish Yield ◽  
Fisheries Resources ◽  
Cost Development ◽  
Species Optimum ◽  
Fisheries Enhancement

Pemacuan sumberdaya ikan adalah suatu teknologi untuk meningkatkanhasil tangkapan ikan dan sekaligus pendapatan nelayan. Potensi produksi ikan perairan umum daratan Indonesia (luasnya 13,85 juta ha) ditaksir 3.034.934 ton/th, sedangkan produksi ikan yang telah dicapai 325.000 ton/th. Berdasarkan keberhasilan penerapan pemacuan sumber daya ikan di beberapa badan air, produksi ikan dapat ditingkatkan menjadi 1.452.947 ton/th. Ke depan, penerapan kebijakan pemacuan sumber daya ikan yang selama ini kurang didasarkan hasil kajian yang memadai perlu diperbaiki. Untuk setiap badan air perlu ditetapkan protokol pemacuan sumber daya ikan. Protokol tersebut meliputi identifikasi sumber daya perairan, menentukan tujuan penebaran, menentukan jenis, jumlah dan ukuran ikan, serta biaya yang diperlukan, mengembangkan strategi penebaran, monitoring dan evaluasi, serta pembentukan kelembagaan pengelolaan. Pedoman pemacuan sumber daya ikan di Indonesia perlu segera ditetapkan yang mengacu pada tata laksana perikanan yang bertanggungjawab.Fisheries enhancement is a technique to increase fish yield and fishers’income. Fish potential yield of inland open waters (13.85 million ha in area) was estimated at 3,034,934 ton/yr, while an average of the actual fish production was 325,000 ton/yr. Based on the success story of fisheries enhancement techniques applied in some water bodies, the fish yield total can be increased to be 1,452,947 ton/yr. In the future, application of policy on fisheries enhancement should be improved. Protocol on fisheries enhancement should be designed for every waterbody. The protocol should consit of identification of fisheries resources,establishment of the objective, determine a suitable fish species, optimum number and size of fish released, estimation of total cost, development of stocking strategy, monitoring and evaluation, and establishment of fisheries management unit. A guideline of fisheries enhancement in Indonesian inland open waters need to be constructed referring to code of conduct for responsible fisheries.

Empirical Prediction of Fish Biomass and Yield

1982 ◽  
Vol 39 (2) ◽  
pp. 257-263 ◽  
Author(s):  
John Mark Hanson ◽  
William C. Leggett
Keyword(s):  
Biomass Yield ◽  
Phosphorus Concentration ◽  
Fish Biomass ◽  
Data Sets ◽  
Dissolved Solids ◽  
Total Phosphorus Concentration ◽  
Data Set ◽  
Fish Yield ◽  
Empirical Prediction ◽  
Morphoedaphic Index

Data taken from the literature were used to develop and compare predictors of fish biomass and yield in lakes. Two new indices, total phosphorus concentration and macrobenthos biomass/mean depth, were the best univariate predictors offish yield (r2 = 0.84 and r2 = 0.48, respectively) and biomass (r2 = 0.75 and r2 = 0.83, respectively) for four different data sets. Both new indices were stronger predictors of fish yield when compared to the morphoedaphic index, total dissolved solids, or mean depth for the same data set. The relatively constant relationship between fish biomass and macrobenthos biomass/mean depth implies a near-constant energy transfer from the benthos to the fish regardless of the number of fish species present.Key words: biomass, yield, fish, macrobenthos, phosphorus, depth, dissolved solids, morphoedaphic index, lakes

scholarly journals Potential future fisheries yields in shelf waters: a model study of the effects of climate change and ocean acidification

2016 ◽  
Vol 13 (2) ◽  
pp. 441-454 ◽  
Author(s):  
S. M. van Leeuwen ◽  
W. F. Le Quesne ◽  
E. R. Parker
Keyword(s):  
Climate Change ◽  
Ocean Acidification ◽  
Biogeochemical Model ◽  
Size Spectrum ◽  
Climatic Effects ◽  
Fish Yield ◽  
Yield Increase ◽  
The North ◽  
Order Of Magnitude ◽  
Fish Yields

Abstract. We applied a coupled marine water column model to three sites in the North Sea. The three sites represent different hydrodynamic regimes and are thus representative of a wider area. The model consists of a hydro-biogeochemical model (GOTM-ERSEM-BFM) coupled one way upwards to a size-structured model representing pelagic predators and detritivores (Blanchard et al., 2009). Thus, bottom-up pressures like changing abiotic environment (climate change, chemical cycling) will have an impact on fish biomass across the size spectrum. Here, we studied three different impacts of future conditions on fish yield: climatic impacts (medium emission scenario), abiotic ocean acidification impacts (reduced pelagic nitrification), and biotic ocean acidification impacts (reduced detritivore growth rate). The three impacts were studied separately and combined, and results showed that sites within different hydrodynamic regimes can respond very differently. The seasonally stratified site showed an increase in fish yields (occurring in winter and spring), with acidification effects of the same order of magnitude as climatic effects. The permanently mixed site also showed an increase in fish yield (increase in summer, decrease in winter), due to climatic effects moderated by acidification impacts. The third site, which is characterised by large inter-annual variability in thermal stratification duration, showed a decline in fish yields (occurring in winter) due to decline in the benthic system which forms an important carbon pathway at this site. All sites displayed a shift towards a more pelagic-oriented system.

Evaluation of the Phosphorus–Chlorophyll Relationship for Lakes Off the Precambrian Shield in Western Canada

1983 ◽  
Vol 40 (1) ◽  
pp. 27-35 ◽  
Author(s):  
E. E. Prepas ◽  
D. O. Trew
Keyword(s):  
Total Nitrogen ◽  
Total Phosphorus ◽  
Saline Lakes ◽  
Total Dissolved Solids ◽  
Western Canada ◽  
Meromictic Lakes ◽  
Freshwater Lakes ◽  
Precambrian Shield ◽  
The Mean ◽  
North Temperate Lakes

Summer chlorophyll (Chl), spring and summer total phosphorus (TP), and total nitrogen (TN) data were collected from 25 lakes off the Precambrian Shield in Alberta. Contrary to the results reported in previous studies in western Canada, the spring TP–summer Chl relationship (n = 29, r2 = 0.67) and TN:TP ratios were similar to those reported for other north-temperate lakes. However, there was less variation in the summer TP–summer Chl relationship (n = 34, r2 = 0.81) than in the spring TP–summer Chl relationship. This is a result of the variability in the summer TP:spring TP ratio which ranged from 0.5 to 2.9 in these lakes. In the shallow productive freshwater lakes TP concentrations increased dramatically between spring and summer (the average summer TP:spring TP ratio was 1.7), whereas in the thermally stratified freshwater lakes (most of which were partially meromictic) summer TP concentrations were much lower than spring TP concentrations (the mean ratio was 0.7). There was less chlorophyll per unit TP in saline lakes (i.e. lakes with more than 500 mg/L total dissolved solids) than in freshwater lakes.Key words: phosphorus, chlorophyll, western lakes, saline lakes, meromictic lakes

Assessing Fishery Potentials of Lakes and Reservoirs

1973 ◽  
Vol 30 (12) ◽  
pp. 2000-2009 ◽  
Author(s):  
H. F. Henderson ◽  
R. A. Ryder ◽  
A. W. Kudhongania
Keyword(s):  
Lake Tanganyika ◽  
Direct Methods ◽  
Total Dissolved Solids ◽  
Lake Productivity ◽  
Potential Yield ◽  
First Order ◽  
Morphoedaphic Index ◽  
Lakes And Reservoirs ◽  
The Mean ◽  
Actual Yield

Timeliness in estimating fishery potentials seems more important than precision, at least in the earlier periods of development of specific fisheries. Comparative studies of several sets of lakes, particularly of those supporting developing fisheries in Africa, suggest that potential yield may be related to several simple indices of production. The morphoedaphic index, derived from measures of total dissolved solids and the mean depth, has provided the simplest and most general approach to the problem of initial estimates of potential yield in lakes and reservoirs. Other methods of relating yield to nutrient concentration and primary production reinforce the concept of the dependence of potential yield on lake productivity. During the developing phase of a fishery more direct methods of estimating potential yield, through estimates of the production of the extant stocks, are also being used with some success. These have been adapted from fishery models developed for single stocks. In keeping with the need for rapid assessments during development, the simplest models have been emphasized. An equivalence between production and the product of biomass and mortality rate, along with the assumption that from 30 to 50% of the production of a stock is potentially harvestable, appears particularly useful. The problem of additivity of the potential yields of individual stocks seems relatively unimportant in first-order estimates, though the question of interactions is being examined, particularly in Lake Tanganyika. Programs of monitoring relative abundance of stocks over time have also been useful, both in indicating the approach of actual yield to potential yield and, after "calibration" against actual yields, as indices of stock and total biomasses.

scholarly journals Future fisheries yield in shelf waters: a model study into effects of a warmer and more acidic marine environment

2015 ◽  
Vol 12 (13) ◽  
pp. 9695-9727
Author(s):  
S. M. van Leeuwen ◽  
W. le Quesne ◽  
R. E. Parker
Keyword(s):  
Ocean Acidification ◽  
Biogeochemical Model ◽  
Size Spectrum ◽  
Climatic Effects ◽  
Fish Yield ◽  
Yield Increase ◽  
The North ◽  
Model Study ◽  
Order Of Magnitude ◽  
Fish Yields

Abstract. We applied a coupled, marine water column model to three sites in the North Sea. The three sites represent different hydrodynamic regimes and are thus representative of a wider area. The model consists of a hydro-biogeochemical model (GOTM-ERSEM-BFM) coupled one way upwards to a size-structured model representing pelagic predators and detritivores (Blanchard et al., 2009). Thus, bottom-up pressures like changing abiotic environment (climate change, chemical cycling) impact on fish biomass across the size spectrum. Here, we studied three different impacts of future conditions on fish yield: climatic impacts (medium emission scenario), abiotic ocean acidification impacts (reduced pelagic nitrification) and biotic ocean acidification impacts (reduced detritivore growth rate). The three impacts were studied separately and combined, and showed that sites within different hydrodynamic regimes responded very differently. The seasonally stratified site showed an increase in fish yields (occuring in winter and spring), with acidification effects of the same order of magnitude as climatic effects. The permanently mixed site also showed an increase in fish yield (increase in summer, decrease in winter), due to climatic effects moderated by acidification impacts. The third site, which is characterised by large interannual variability in thermal stratification duration, showed a decline in fish yields (occuring in winter) due to decline of the benthic system which forms an important carbon pathway at this site. All sites displayed a shift towards a more pelagic oriented system.

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