Fish Spawning Habitats and Modelled Probability Over 50%
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NZFFD Fish Spawning Habitats Various types of fish species live and spawn their eggs during different times of the year in freshwaters of New Zealand. The species have evolved to depend on the unique ecological conditions of their habitat. Therefore, they are vulnerable to any impact on their habitat. Any activity such as logging the riparian trees on the sides of rivers or the surrounding forest can impact the existence of these fish species. The objective of this analysis was to find parts of rivers that are used by various fish species for spawning. MPI needs to know that, so that it can regulate forest logging on the immediate sides of those rivers. The restrictions on logging apply when one or two conditions as below are established: A. The river reach (or segment) is within 1 km upstream or downstream of any NZFFD sample (this layer) B. The river reach has an associated probability of greater than 50 % for at least one fish species (the modelled predictive layers). This dataset was revised in June 2026 and was published following Gazette in June 2026. Non-migratory Fish Spawning Habitats The original spatial data for each non-migratory fish species was received from the department of Conservation (DOC) as individual shapefiles for each species. These data showed the habitat range of species along rivers indicated as slim buffers (~1-2m). These buffers, however, are indicative only and do not represent the areas where the regulation applies, because: a) size of these buffers are too small falling short of the regulation requirements, b) river data used as the basis of this layer has spatial inaccuracies which makes it impossible to locate the exact boundaries of the buffer areas that the regulation would apply. The above layers were merged into one spatial layer and the attributes were standardised to comply with the rest of spatial layers within the NES (National Environmental Standards) fish database. The added attributes included scientific names, common names, spawning period and migration habit of fish species. Some of the species received in this category from DOC are known to be migratory (diadromous) which are generally identified as WhiteBait. This dataset was revised in June 2026 and was published following Gazette in June 2026. Fish Spawning Modelled Probability over 50% The predictive fish species habitats were provided by the National Institute of Water and Atmospheric Research (NIWA). This data was refined and made into a spatial layer by MPI. The resulting spatial layer indicates sections of rivers where there is 50% or more probability for the existence of given species. Along with the sampled NZFFD data, these habitats are used by MPI to determine sections of rivers where freshwater fish species use for spawning, which in effect, requires setting limitations on deforestation on the margins of those rivers. This dataset was revised in June 2026 and was published following Gazette in June 2026. The NES-CF Web App is publicly accessible and can be found here: https://geospatial.mpi.govt.nz/NESCF
NZFFD 鱼类产卵栖息地 新西兰淡水水域在一年中的不同时段栖息着多种鱼类，并完成产卵活动。这些物种已演化出依赖栖息地独特生态条件的生存策略，因此其种群极易受到栖息地受到的任何干扰影响。诸如河道两侧河岸带林木采伐或周边森林开发等人类活动，均可能威胁这些鱼类物种的存续。本次分析的目标是定位各类鱼类物种用于产卵的河段区段。新西兰初级产业部（Ministry for Primary Industries, MPI）需要掌握此类信息，以便对相关河道沿岸的森林采伐活动进行监管。当满足以下任一或两项条件时，将实施采伐限制： A. 该河段位于任意NZFFD采样点（本图层）上下游1公里范围内； B. 该河段对应至少一种鱼类物种的预测概率高于50%（基于建模预测图层）。 本数据集于2026年6月完成修订，并于2026年6月随政府公报正式发布。 非洄游鱼类产卵栖息地 最初的各非洄游鱼类物种空间数据由新西兰保护部（Department of Conservation, DOC）提供，为各物种独立的形状文件（shapefile）。此类数据以约1-2米的窄缓冲区形式标注了物种沿河道的栖息范围，但该缓冲区仅为示意性标注，并不代表需实施监管的区域，原因如下： a) 缓冲区尺寸过小，未达到监管要求； b) 作为本图层基础的河道空间数据存在空间精度误差，无法准确定位监管所需的缓冲区精确边界。 上述图层已合并为单一空间图层，并对属性字段进行标准化处理，以契合国家环境标准（National Environmental Standards, NES）鱼类数据库的其他空间图层要求。新增的属性字段包含鱼类的学名、俗名、产卵周期及洄游习性。本次从保护部获取的该类别物种中，部分被认定为具有溯河洄游（diadromous）习性，通常以银鱼（WhiteBait）指代。本数据集于2026年6月完成修订，并于2026年6月随政府公报正式发布。 产卵预测概率≥50%鱼类栖息地 鱼类物种栖息预测数据由新西兰国家水与大气研究所（National Institute of Water and Atmospheric Research, NIWA）提供，新西兰初级产业部（MPI）对该数据进行优化处理并制作为空间图层。最终生成的空间图层标注了对应目标物种存在概率≥50%的河道区段。结合采样得到的NZFFD数据，MPI利用此类栖息地信息确定淡水鱼类的产卵河道区段，进而据此对相关河道沿岸的森林采伐活动设置限制要求。本数据集于2026年6月完成修订，并于2026年6月随政府公报正式发布。 NES-CF 网络应用程序面向公众开放，访问地址为：https://geospatial.mpi.govt.nz/NESCF
