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Potential whitebait spawning zones. Data also shows which areas are inside and outside the Coastal Marine Area (CMA). |
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Potential whitebait spawning zones. Data also shows which areas are inside and outside the Coastal Marine Area (CMA). |
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Bay of Plenty Regional Council |
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5000 |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-weight:bold;">11/01/2024 - </SPAN><SPAN>Added field </SPAN><SPAN STYLE="font-weight:bold;">DrainWaterQuality</SPAN><SPAN>. The information in this field comes from the SDE layer WaterQualityLine. If the WaterQualityLine layer</SPAN><SPAN> i</SPAN><SPAN>s change</SPAN><SPAN>d</SPAN><SPAN> then this whitebait layer needs to </SPAN><SPAN>be </SPAN><SPAN>checked and updated.</SPAN></P><P><SPAN>This dataset identifies potential inanga spawning zones based on where the salt wedge extended to at </SPAN><SPAN>high tide. The condition of the potential spawning habitat was also examined although information on these is not contained in this dataset.</SPAN></P><P><SPAN>Field </SPAN><SPAN>surveys were carried out in 2017-2018 to identify where spawning is likely to occur</SPAN><SPAN> including surveys to measure the extent of the salt wedge in 19 waterways across the Bay of Plenty region. </SPAN></P><P><SPAN>For the salinity survey sites see Salinity_SaltWedgeSurveyLocation in PROD_VECTOR.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>Adult inanga spawn in the lower, tidally influenced reaches of waterways amongst vegetation that has been submerged on the mean high-water spring (MHWS) tides. Spawning occurs mostly between January and May, although spawning may occur during later months in more northern areas of the country. Spawning only occurs at the upper margin of the saltwater wedge, which is the furthest extent that salt water can penetrate upstream against the flow of the river. In steep gradient streams, the location of a salt wedge will be in a relatively small area, while in low gradient streams, the potential location of the salt wedge may vary greatly along the river’s length depending on the magnitude of the tide pushing the salt inland, and the flow of the stream pushing the salt wedge seaward.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>Given the potentially large variability in the location of the salt wedge, Suren and Sykes (2021) identified potential īnanga spawning zones throughout the region, based on salt wedge extent at high tide. This work was based on field surveys conducted in 2017-2018 that measured the location of the salt wedge, and on a subsequent model based on the Digital Terrain Model (LiDAR survey). This allowed us to produce </SPAN><SPAN>data </SPAN><SPAN>that show</SPAN><SPAN>s</SPAN><SPAN> the location of the areas in these lowland waterways where potential salt wedges could occur.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>This </SPAN><SPAN>data was created by</SPAN><SPAN> overlay</SPAN><SPAN>ing</SPAN><SPAN> measured salinity with modelled salt-wedge zones derived from detailed LiDAR elevation data. Activities occurring within these salt wedge zones should be conducted in a manner that minimises potential adverse effects on spawning habitats in these areas. However, some of these areas may have poor habitat quality for spawning (e.g., steep banks, or unsuitable riparian vegetation), so activities that can reduce the bank angle, or replace undesirable vegetation (e.g., blackberry, gorse) with more desirable vegetation (native or exotic pasture grasses) is encouraged.</SPAN></P><P><SPAN>For more information see the report </SPAN><A href="https://atlas.boprc.govt.nz/api/v1/edms/document/A3763155/content" target="_blank" STYLE="text-decoration:underline;"><SPAN>"The location and habitat conditions of whitebait spawning zones in the Bay of Plenty" </SPAN></A></P><P><SPAN /></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This data can be supplied to people and organisations outside the Bay of Plenty Regional Council. The data is available free provided the following is attached to the information in an email and as a text file if the data is supplied in other ways.</SPAN></P><P STYLE="font-style:italic;font-weight:bold;margin:0 0 0 20;"><A href="https://creativecommons.org/licenses/by-nd/4.0/" STYLE="text-decoration:underline;"><SPAN>CC BY-ND</SPAN></A></P><P STYLE="font-style:italic;margin:0 0 0 20;"><SPAN STYLE="font-size:12pt">This license enables reusers to copy and distribute the material in any medium or format in unadapted form only, and only so long as attribution is given to the creator. The license allows for commercial use. CC BY-ND includes the following elements:</SPAN></P><P STYLE="font-style:italic;margin:0 0 0 20;"><SPAN STYLE="font-size:12pt">BY: credit must be given to the creator.</SPAN></P><P STYLE="font-style:italic;margin:0 0 0 20;"><SPAN STYLE="font-size:12pt">ND: No derivatives or adaptations of the work are permitted.</SPAN></P><P><SPAN>If you do not accept the terms of the Creative Commons Licence </SPAN><SPAN>4</SPAN><SPAN>.0 BY</SPAN><SPAN>-ND</SPAN><SPAN> then please delete this email and data.</SPAN></P><P><SPAN>Team responsible: Science</SPAN></P></DIV></DIV></DIV> |
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Fish spawning - potential Inanga (whitebait) zones |
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["Fish","spawning","inanga","whitebait"] |
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en-NZ |
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150000000 |
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