Ichthyoplankton communities from Saint John Harbour and Passamaquoddy Bay on the New Brunswick shore of the Bay of Fundy, Canada, were sampled seasonally between 2011 and 2014. Saint John Harbour is an industrialised port whereas Passamaquoddy Bay is less developed, with a focus on aquaculture. In total, 32 species of fish eggs and larvae were recorded: 26 species in Saint John Harbour and 25 in Passamaquoddy Bay. Nineteen species were common to both areas. The dominant species in Passamaquoddy Bay were Enchelyopus cimbrius, Urophycis sp., Scophthalmus aquosus, and Tautogolabrus adspersus. In Saint John Harbour, E. cimbrius, Urophycis sp., Clupea harengus, and Pseudopleuronectes americanus were most abundant. The communities of the two areas were significantly different. This was most pronounced in summer when Saint John Harbour had a much higher proportion of C. harengus and much lower overall abundances, relative to Passamaquoddy Bay. Saint John Harbour demonstrated higher taxonomic diversity than Passamaquoddy Bay, attributable to the wider variety of salinity regimes present within the harbour. In both areas, the ichthyoplankton communities were strongly seasonal with the highest abundance and diversity in summer. Surface temperature was the best predictor of community composition. Given its industrialisation, Saint John Harbour had a surprisingly diverse ichthyoplankton community, comparable to the less impacted Passamaquoddy Bay. The strong flushing in the harbour by high riverine output and tidal exchange may diminish industrial impact. We strongly recommend incorporating ichthyoplankton into the long-term monitoring of Saint John Harbour and provide guidance to this end.

在2011年至2014年之间，对加拿大芬迪湾新不伦瑞克海岸圣约翰港和帕萨玛古迪湾的浮游鱼类群落进行了季节性采样。圣约翰港是工业化港口，而帕萨玛古迪湾则较不发达，侧重于水产养殖。总共记录了32种鱼卵和幼虫：圣约翰港有26种，Passamaquoddy湾有25种。这两个地区共有19种。在Passamaquoddy湾的优势种为Enchelyopus cimbrius，Urophycis sp。，Scophthalmus aquosus和Tautogolabrus adspersus。在圣约翰港（E. cimbrius），Urophycis sp。，Clupea harengus，和美洲的Pseudopleuronectes最多。这两个地区的社区明显不同。这在夏季最为明显，当时圣约翰港的海角梭菌比例更高相对于Passamaquoddy湾，总体丰度要低得多。圣约翰港比帕萨马夸迪湾具有更高的生物分类学多样性，这归因于海港内盐分制度的多样性。在这两个地区，鱼鳞浮游生物群落都是强烈的季节性，夏季的丰度和多样性最高。表面温度是群落组成的最佳预测指标。鉴于其工业化程度，圣约翰港拥有令人惊讶的多样化的鱼鳞浮游生物群落，可与受影响较小的帕萨马夸迪湾媲美。高河水产量和潮汐交换导致港口强烈冲厕，可能会减少工业影响。我们强烈建议将鱼鳞浮游生物纳入圣约翰港的长期监测，并为此目的提供指导。