scholarly journals Protection of spawning habitat for potamodromous fish, an urgent need for the hydropower planning in the Andes

2021 ◽  
Vol 19 (3) ◽  
Author(s):  
Cintia Moreno-Arias ◽  
Silvia López-Casas ◽  
Carlos A. Rogeliz-Prada ◽  
Luz Jiménez-Segura
Keyword(s):  
Embryo Development ◽  
Upstream Migration ◽  
Spawning Habitat ◽  
Spawning Grounds ◽  
Spawning Areas ◽  
Fish Spawning ◽  
Nursery Habitats ◽  
Migratory Routes ◽  
Future Loss ◽  
Magdalena River

Abstract Because dams block migratory routes of potamodromous fish to their spawning areas, and energy generation changes natural flow seasonality, it is necessary to identify spawning areas and their conditions. This information will help in management decisions in the Magdalena River basin regarding the future hydropower development. We identified which characteristics of the tributaries to the Magdalena River are important for determining potamodromous fish spawning grounds, and we estimated the percentage of future loss of spawning areas because of dam development. Ichthyoplankton density is directly related to the floodplain area, and inversely related with channel slope. Low channel slopes offer adult fish a longer distance for their upstream migration and a longer time for embryo development during their drift downstream from the spawning areas to nursery habitats (floodplain lakes). These features could increase the migration distance of the adults, the time for initial embryo development, and, because of its relationship with nursery habitats access, the offspring survival. The potential loss of the actual spawning grounds in the river network was estimated to be nearly 70% because of new dams. Our findings will help to reduce conflicts between hydropower and ecological interests.

Does the value of newly accessible spawning habitat for walleye (Stizostedion vitreum) depend on its location relative to nursery habitats?

2003 ◽  
Vol 60 (12) ◽  
pp. 1527-1538 ◽  
Author(s):  
Michael L Jones ◽  
John K Netto ◽  
Jason D Stockwell ◽  
Joseph B Mion
Keyword(s):  
Habitat Restoration ◽  
Stizostedion Vitreum ◽  
Spawning Habitat ◽  
Nursery Areas ◽  
Western Lake ◽  
Spawning Areas ◽  
Nursery Habitats ◽  
Larval Production ◽  
Sandusky River ◽  
Western Lake Erie

The benefit accrued from habitat restoration actions may depend not only on the quality and quantity of habitat restored, but also on its location relative to other critical habitats. For example, walleye (Stizostedion vitreum) larvae need to be transported by river currents from spawning to nursery habitats soon after emergence. We developed a model of river transport survival for larval walleye to evaluate potential recruitment from riverine spawning habitats to lacustrine nursery areas. Published relationships were used to model transport survival as a function of temperature and velocity. At greater distances from nursery areas, mortality risk increases, particularly as a result of starvation at relatively high river temperatures. We applied the model to the Sandusky River, a tributary to western Lake Erie, and found potential larval production from spawning habitat above an existing dam to exceed the potential of presently accessible spawning areas by a factor of 8. We used a generalized version of the model to show that for transport distances of less than 100 km, transport survival is much more sensitive to variations in river flows, whereas at greater distances, temperature becomes increasingly important.

scholarly journals Electronic tagging data and habitat envelope modeling used to monitor spatial persistency and possible relocation of spawning grounds for the bluefin tuna in the East Atlantic and the Mediterranean Sea

2016 ◽  
Author(s):  
Andres Ospina-Alvarez ◽  
Susana Sainz Trápaga ◽  
Sergi Tudela ◽  
Antonio Di Natale ◽  
Gemma Quílez-Badia
Keyword(s):  
Mediterranean Sea ◽  
Bluefin Tuna ◽  
Habitat Characteristics ◽  
Management Approach ◽  
Tyrrhenian Sea ◽  
Spawning Habitat ◽  
Spawning Grounds ◽  
Climate Conditions ◽  
Spawning Areas ◽  
The Mediterranean

A spawning habitat envelope has been created for bluefin tuna in its traditional spawning ground in the Mediterranean Sea by combining environmental variables and species behavior. We used logistic regressions through a generalized linear model (GLM) approach to determine whether reproduction was affected by spawning habitat characteristics and individual behavior. Results from the implementation of the model predicted a high probability of occurrence of reproductive events associated with 17 tagged tuna. Some of them matched the already well known spawning grounds in the Mediterranean Sea (the area around the Balearic Islands, the Tyrrhenian Sea and the Gulf of Sirte). The model also proposed some other areas seldom or not at all mentioned in the bibliography in both, the Mediterranean and the Atlantic Ocean, such as the Alboran Sea, the Catalan Sea, the Gulf of Lions and the Bay of Biscay. This model provides an objective methodology to predict and adapt spawning areas, and to identify other potential but unknown, or even new, spawning areas and periods for the species. Moreover, the application of the present methodology could help the implementation of an adaptive management approach for Atlantic bluefin tuna by predicting areas suitable for spawning and identifying changes in spawning areas and season in the currently highly changing ocean and climate conditions.

scholarly journals Electronic tagging data and habitat envelope modeling used to monitor spatial persistency and possible relocation of spawning grounds for the bluefin tuna in the East Atlantic and the Mediterranean Sea

2016 ◽  
Author(s):  
Andres Ospina-Alvarez ◽  
Susana Sainz Trápaga ◽  
Sergi Tudela ◽  
Antonio Di Natale ◽  
Gemma Quílez-Badia
Keyword(s):  
Mediterranean Sea ◽  
Bluefin Tuna ◽  
Habitat Characteristics ◽  
Management Approach ◽  
Tyrrhenian Sea ◽  
Spawning Habitat ◽  
Spawning Grounds ◽  
Climate Conditions ◽  
Spawning Areas ◽  
The Mediterranean

A spawning habitat envelope has been created for bluefin tuna in its traditional spawning ground in the Mediterranean Sea by combining environmental variables and species behavior. We used logistic regressions through a generalized linear model (GLM) approach to determine whether reproduction was affected by spawning habitat characteristics and individual behavior. Results from the implementation of the model predicted a high probability of occurrence of reproductive events associated with 17 tagged tuna. Some of them matched the already well known spawning grounds in the Mediterranean Sea (the area around the Balearic Islands, the Tyrrhenian Sea and the Gulf of Sirte). The model also proposed some other areas seldom or not at all mentioned in the bibliography in both, the Mediterranean and the Atlantic Ocean, such as the Alboran Sea, the Catalan Sea, the Gulf of Lions and the Bay of Biscay. This model provides an objective methodology to predict and adapt spawning areas, and to identify other potential but unknown, or even new, spawning areas and periods for the species. Moreover, the application of the present methodology could help the implementation of an adaptive management approach for Atlantic bluefin tuna by predicting areas suitable for spawning and identifying changes in spawning areas and season in the currently highly changing ocean and climate conditions.

scholarly journals Resources and fishery of Pacific salmon in Magadan region in the beginning of the 21st century

Trudy VNIRO ◽  
2020 ◽  
Vol 179 ◽  
pp. 90-102
Author(s):  
M. N. Gorokhov ◽  
V. V. Volobuev ◽  
I. S. Golovanov
Keyword(s):  
Chum Salmon ◽  
Coho Salmon ◽  
Pacific Salmon ◽  
Pink Salmon ◽  
Spawning Grounds ◽  
Magadan Region ◽  
Spawning Areas ◽  
Optimal Values ◽  
In The Beginning ◽  
Salmon Fishery

There are two main areas of pacific salmon fishing in the Magadan region: Shelikhova Gulf and Tauiskaya Bay. The main fishing species is pink salmon in the region. Its share of total salmon catch by odd-year returns reaches 85 %. Data on the dynamics of escapement to the spawning grounds of pink salmon of the Shelikhova Gulf and Tauiskaya Bay are presented. The displacement of the level of spawning returns of pink salmon into the Shelihova Gulf with the simultaneous reduction of its returns to the Tauiskaya Bay is shown. Data on the dynamics of the fishing indicators of pink salmon for the two main fishing areas are provided. The Tauiskaya Bay as the main pink salmon fishery area loses its importance is shown. Graphical data on the escapement of producers pink salmon to the spawning grounds are presented and the optimal values of spawning escapements are estimated. Chum salmon is the second largest and most fishing species. Information on the dynamics of the number of returns, catch and escapement to the spawning grounds of chum salmon is given. The indicators of escapement to the spawning areas and their compliance with the optimal passes of salmon producers are analyzed. The issues of the dynamics of returns number, catch and the escapement to the spawning grounds of coho salmon producers are considered. The level of the escapement to the spawning areas is shown and the ratio of actual to optimal values of passes is estimated. The role of coho salmon as an object of industrial fishing and amateur fishing is shown. The extent of fishing press on individual groups of salmon populations is discussed. It is concluded that it is necessary to remove the main salmon fishery from the Tauiskaya Bay to the Shelikhova Gulf.

scholarly journals Impact of fifteen days fishing ban in the major spawning grounds of hilsa (Tenualosa ilisha Hamilton 1822) on its spawning success

2015 ◽  
Vol 2 (3) ◽  
pp. 491-497 ◽  
Author(s):  
Md Anisur Rahman ◽  
Flura ◽  
Tayfa Ahmed ◽  
Md Mehedi Hasan Pramanik ◽  
Mohammad Ashraful Alam
Keyword(s):  
Positive Impact ◽  
Breeding Period ◽  
Spawning Grounds ◽  
Female Ratio ◽  
Spawning Areas ◽  
Percent Composition ◽  
Male Female Ratio ◽  
Similar Quantity ◽  
The Impact ◽  
Spawning Success

The present study was conducted to assess the impact of fifteen days fishing ban on breeding success of hilsa shad in the major spawning grounds of hilsa in the month of September and October, 2015. The study showed that fishing ban during spawning seasons have significant role in the successful reproduction of hilsa. In and around the spawning grounds among all the captured hilsa, male: female ratio was found 1: 1.86 and percent composition was 35% and 65% respectively. In 2015, percent composition of spent hilsa during major breeding period in the spawning grounds was found 36.60%. The eggs production of hilsa was calculated, in the year 2010, 2011, 2012, 2013, 2014 and 2015 about 336199Kg, 385500Kg, 380400Kg, 447100Kg, 417765Kg and 494365Kg respectively, hilsa eggs could have been produced indicating a positive impact of 15 days fishing ban in the spawning season. Comparatively higher percentages of gravid hilsa were found which were not available in the similar quantity and condition in the fishing ban period in other than spawning areas of hilsa. During the present investigation, fairly higher amount of spent hilsa and juveniles were observed in the spawning grounds. On the other hand, fewer juveniles and spent hilsa were observed in the adjacent areas of the spawning grounds indicating that in comparison to the recent reports there might have little or no changes of the spawning grounds of hilsa occurred. Along with the jatka fry, spawn and fries of other fishes were also found in higher quantity than the previous years and thus it is assumed that 15 days fishing ban also might have positive impact on the successful breeding of other fishes. Overall, the fishing ban was found effective for successful breeding of hilsa.Res. Agric., Livest. Fish.2(3): 491-497, December 2015

Spawning-habitat selection of an Indo-Pacific amphidromous gobiid fish, Sicyopterus lagocephalus (Pallas)

2013 ◽  
Vol 64 (11) ◽  
pp. 1058 ◽  
Author(s):  
Nils Teichert ◽  
Pierre Valade ◽  
Pierre Bosc ◽  
Marine Richarson ◽  
Philippe Gaudin
Keyword(s):  
Habitat Selection ◽  
Logistic Models ◽  
Sampling Procedure ◽  
Limiting Factor ◽  
Spawning Habitat ◽  
Gobiid Fish ◽  
Spawning Areas ◽  
Selection For ◽  
Geomorphic Units ◽  
Selection Of

Freshwater-fish populations of the Indo-pacific region are characterised by a large proportion of amphidromous species. We analysed the spawning-habitat selection of Sicyopterus lagocephalus (Gobiidae: Sicydiinae) within two rivers of the Reunion Island. Reproduction traces are rare events, so a presence-only sampling procedure was performed to collect egg clutches and a random description of available habitat was conducted to generate pseudo-absence data. Logistic models showed a strong selection for microhabitat variables and mesohabitat units. S. lagocephalus selected areas where availability of potential nests was high (small cobble to small boulder) and where interstitial substratum allowed intragravel flow. Our results suggest that the availability of favourable substratum may be a limiting factor, which could result in occupancy of suboptimal areas. Water depth and velocity had less of an effect on the selection of a spawning area. Higher selection for shallow (<60 cm) and lotic (>30 cm s–1) geomorphic units, with an optimum for riffle and cascade, suggested that mesohabitat could be a satisfactory approach to quickly assess the availability of spawning areas within a watercourse for expertise studies.

scholarly journals Evolutionary and ecological constraints of fish spawning habitats

2014 ◽  
Vol 72 (2) ◽  
pp. 285-296 ◽  
Author(s):  
Lorenzo Ciannelli ◽  
Kevin Bailey ◽  
Esben Moland Olsen
Keyword(s):  
Environmental Changes ◽  
Fish Habitat ◽  
Evolutionary Constraints ◽  
Spawning Habitat ◽  
Ecological Constraints ◽  
Genetic Changes ◽  
Fish Spawning ◽  
Developmental Phases ◽  
Plastic Responses ◽  
Spawning Habitats

Abstract For marine fish, the choice of the spawning location may be the only means to fulfil the dual needs of surviving from the egg to juvenile stage and dispersing across different habitats while minimizing predation and maximizing food intake. In this article, we review the factors that affect the choice of fish spawning habitats and propose a framework to distinguish between ecological and evolutionary constraints. We define the former as the boundaries for phenotypically plastic responses to environmental change, in this case the ability of specific genotypes to change their spawning habitat. Processes such as predation, starvation, or aberrant dispersal typically limit the amount of variability in spawning habitat that fish may undergo from 1 year to the next, and thus regulate the intensity of ecological constraints. Evolutionary constraints, on the other hand, refer to aspects of the genetic make-up that limit the rate and direction of adaptive genetic changes in a population across generations; that is, the potential for micro-evolutionary change. Thus, their intensity is inversely related to the level of genetic diversity associated with traits that regulate spawning and developmental phases. We argue that fisheries oceanographers are well aware of, and more deeply focused on, the former set of constraints, while evolutionary biologists are more deeply focused on the latter set of constraints. Our proposed framework merges these two viewpoints and provides new insight to study fish habitat selection and adaptability to environmental changes.

scholarly journals Long-term stability in modelled zooplankton influx could uphold major fish spawning grounds on the Norwegian continental shelf

2016 ◽  
Vol 73 (2) ◽  
pp. 189-196 ◽  
Author(s):  
Anders Frugård Opdal ◽  
Frode B. Vikebø
Keyword(s):  
Continental Shelf ◽  
Gadus Morhua ◽  
Fish Larvae ◽  
Ocean Model ◽  
Clupea Harengus ◽  
Calanus Finmarchicus ◽  
Crustacean Zooplankton ◽  
Spawning Grounds ◽  
Fish Spawning ◽  
Norwegian Continental Shelf

Early life stages of fish spawned on the Norwegian continental shelf have long been suggested to depend on eggs and nauplii from the crustacean zooplankton Calanus finmarchicus for survival. Calanus finmarchicus overwinters in the deep basins of the Norwegian Sea, and gravid females must be advected onto the shelf prior to spawning if eggs and nauplii larvae are to serve as food for fish larvae. In this study, cross-shelf advection of C. finmarchicus is simulated over 52 years (1960–2011) using a numerical ocean model coupled with an individual-based model. The results suggest that cross-shelf transport of C. finmarchicus is surprisingly stable across years and that transport is particularly concentrated immediately upstream of the two major spawning areas for the Northeast Arctic cod (Gadus morhua) and the Norwegian spring-spawning herring (Clupea harengus), namely Lofoten and Møre, respectively. Two large topographical features, the Træna Trough and the Norwegian Trench, appear to be funnelling C. finmarchicus onto the shelf in these two areas. This could suggest that the fish spawning grounds outside Møre and Lofoten are, in part, maintained owing to stable interannual food supply in spring.

Differences in sexual maturity and fall emigration between diploid and triploid brook trout (Salvelinus fontinalis) in an Adirondack lake

1997 ◽  
Vol 54 (8) ◽  
pp. 1808-1812 ◽  
Author(s):  
J A Warrillow ◽  
D C Josephson ◽  
W D Youngs ◽  
C C Krueger
Keyword(s):  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Gonadal Development ◽  
Spawning Habitat ◽  
Diploid Males ◽  
Reproductive Risk ◽  
Spawning Areas ◽  
In Captivity ◽  
Adirondack Lakes ◽  
Triploid Fish

High levels of emigration coincident with maturity and spawning have been reported from brook trout (Salvelinus fontinalis) populations in Adirondack lakes. These lakes typically had few spawning areas and required stocking to maintain populations. We compared diploid and triploid brook trout to identify differences in gonadal development and emigration. Age 1 + and 2 + diploid and triploid brook trout held in captivity were examined internally for gonadal development. More diploid trout were mature than triploid fish (p < 0.01). Of triploid brook trout that matured, all were males. Yearling diploid and triploid brook trout were also stocked into a lake that had an outlet but no spawning areas. During the fall spawning season, only mature yearling triploid males, diploid males, and diploid females were caught in an outlet trap. No triploid females were caught. A greater proportion of diploids emigrated than triploids (p < 0.01). Triploidy in females arrested emigration by preventing sexual maturation. Triploid male brook trout should not be stocked because they can pose a reproductive risk to wild brook trout downstream from lakes. Stocking triploid females could reducefall emigration and thus reduce the loss of catchable brook trout from Adirondack lakes with outlets and little spawning habitat.

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