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Patterns of color phase indicate spawn timing at a Nassau grouper Epinephelus striatus spawning aggregation

Current Zoology 2012年第1期58卷 73-83页

作者： Archer, Stephanie K Heppell, Scott A Semmens, Brice X Pattengill-Semmens, Christy V Bush, Phillippe G Mccoy, Croy M Johnson, Bradley C Department of Fisheries and Wildlife 104 Nash Hall Oregon State University Corvallis OR 97331 USA Reef Environmental Education Foundation (REEF) PO Box 246 Key Largo Fl 33037 USA Department of Environment Cayman Islands Government P.O. Box 486GT Grand Cayman Cayman Islands

Nassau grouper Epinephelus striatus are a large bodied, top level predator that is ecologically important throughout the Caribbean. Although typically solitary, Nassau grouper form large annual spawning aggregations at predictable times in spe- cific locations. In 2003, The Cayman Islands Marine Conservation Board established protection for a newly rediscovered Nassau grouper spawning aggregation on Little Cayman, British West Indies. The large size of this aggregation provides a unique oppor- tunity to study the behavior of Nassau grouper on a relatively intact spawning aggregation. During non-spawning periods Nassau grouper display a reddish-brown-and-white barred coloration. However, while aggregating they exhibit three additional color phases：＂bicolor＂, ＂dark＂, and ＂white belly＂. We video sampled the population on multiple days leading up to spawning across five spawning years. Divers focused a laser caliper equipped video camera on individual fish at the aggregation. We later ana- lyzed the video to determine the length of the fish and record the color phase. Our observations show that the relative proportion of fish in the bicolor color phase increases significantly on the day leading up to the primary night of spawning. The increase in the proportion of the bicolor color phase from 0.05 early in the aggregation to 0.40 on the day of spawning suggests that this color phase conveys that a fish is behaviorally and physiologically prepared to spawn. Additionally, 82.7% of fish exhibiting dark or white belly coloration early in the aggregation period suggests that these color phases are not only shown by female fish as was previously posited [Current Zoology 58 （1）： 73-83, 2012].

关键词： Nassau grouper Epinephelus striatus spawning aggregation Nuptial coloration spawning behavior

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Spatial and temporal distributions and some biological aspects of commercially important fish species of Lake Tana,Ethiopia

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Journal of Coastal Life Medicine 2014年第8期 589-595页

作者： Dereje Tewabe Kokebe Bahirdar Fisheries and 0ther Aquatic Life Research Center P.0.Box 794Ethiopia

Objective:To know spatial,temporal distributions and some biological aspects of commercially important fish species of Lake ***:Distribution of fish species in Lake Tana was studied from November 2009 to October 2012 based on samples collected every other month using gillnets of 60,80,100,120 and 140 mm stretched mesh *** species,Clarias gariepinus,Oreochromis niloticus,and Varicorhinus beso are commercially important fish species and form 68%,18%,14%and 0.5%of the pooled experimental fish *** was significant variability among years and sampling sites of both temporal and spatial aspects;Mann-Whitney U tests were used for pair wise comparisons of sites and ***:The composition of Labeobarbus *** Varicorhinus beso shows significant *** the other hand,the composition of Oreochromis niloticus did not change,but Clarias gariepinus increased by 100%by catch *** most likely explanations for the total decline in abundance of fish species are the increase of the illegal commercial gillnet fishery targeting their spawning aggregations in the wetlands and river mouths,and the increasing trend of the degradation of spawning and nursery habitats both in the lake and major tributary rivers of the catchment ***:There should be a need for urgent development of a management plan focusing on ensuring sustainable utilization of a resource by fishing effort,gear mesh size and gear type restrictions,and controlling the spawning grounds from different types of human encroachment and designing closing seasons and spawning grounds during the breeding seasons of different fish species of Lake Tana.

关键词： Breeding season Size at first maturity spawning aggregation Species composition

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