Summer Work Term

1. The Bonefish Albulavulpes Bonefish are an ecologically and economically important species of fish that reside in tropical shallow waters worldwide. Bonefish are one of the most sought after sport fish in the world, attracting anglers from all over the world to the search the flats of the Bahamas for these elusive fish. Anglers targeting bonefish contribute $141 to the Bahamian economy annually. Bonefish are important to Bahamians as both a symbol and food source. There are three different species of bonefish found in the Bahamas. The most common being Albulavulpesfollowed by Albula sp. B and Albulanemoptera. Anthropogenic Threats Coastal degradation and illegal fishing pose the biggest threat to the stability of the bonefish population in the Bahamas. The construction of hotels and the dredging of canals is highly destructive and disrupts various habitats like mangrove forest and sea grass flats that bonefish and other coastal flora and fauna depend on. Illegal netting of bonefish cannot only capture whole schools of bonefish but as well capture commercially important juvenile reef fish that use the shallow flats as nursery habitat. • Laws Protecting Bonefish • Bahamians are allowed to catch bonefish using hook and line for personal consumption. • Buying or selling bonefish and using nets to catch them is illegal. • Individuals can be fined up to $3,000 and/or spend a year in jail for selling and netting bonefish. Bonefish Ecology and Conservation in The Islands of the BahamasBy: Justin Lewis Supervisor: Dr. Jim Williams Traditional Ecological Knowledge A shift in recent decades towards ecosystem-based management practices andsubsequent efforts to identify essential fish habitats have brought about a considerablemovement towards the acceptance and utilization of fishers’ ecological knowledge in fisheries research and management efforts. To date, there has been no organized effort made to record or utilize the potentially valuable ecological knowledge of local fishermen or bonefishing guides in The Bahamas. Given the limited knowledge available on bonefish life history, and largely unsuccessful attempts thus far to elucidate juvenile habitats of bonefish, it seemed obvious that all possible sources of information should be considered in our attempt to focus sampling efforts on habitats and locations most likely to harbour juveniles.Theirknowledge was an effective tool in helping us locate juvenile bonefish and their nursery habitats. Juvenile Bonefish Research There is very little known about bonefish with the majority of research being focused on the mature and the larval life stages and little to nothing known about the juvenile stage of the bonefish’s life history. The goal of our research was to capture juvenile bonefish and identify the areas they use a nursery habitats. Prior juvenile research in Belize and Florida focused their efforts along windward sandy beaches and captured over 1,000 juvenile bonefish, 95% of which were Albulasp. B and the remaining 5% was Albulavulpes. To help us identify where juvenile bonefish might be we utilized traditional ecological knowledge (TEK) from bonefish guides and local fisherman. The identification of the habitat(s) that juvenile bonefish use is very important when it comes to the conservation of not only bonefish but also a variety of other flora and fauna that take residence on the flats. • Results • Juvenile Bonefish • Of total 342 hauls, 39 (11%) caught juvenile bonefish • Total 143 juvenile bonefish caught • Number of JBF per haul ranged from 1 to 35, (median = 1) • Sizes of juveniles ranged from 21 to 117 mm FL (<1” – 4.5”) (Mean=70, SD=14.8) • Habitat • Depths range: 0.5 - 3 feet (Mean = 1.25, sd= .75) • Water Temp range:29 – 36° C (Mean = 31.2, sd= 2) • 69% of hauls in calm conditions, remainder in <1 ft chop • 77% substrate dominated by fine sand or silt • 23% mixture of sand, algae, seagrass • 74% adjacent to mangrove (within ≈ 25m) • 31% adjacent to dense seagrass and/or algae • Bycatch • 97% contained mottled mojarra(a.k.a shad) • (2 - 1000, median = 68) • 31% contained Barracuda (1-5, median = 1.5) • 18% contained silversides (1-14, median=9) Summer Work Term For my AQUA 400 work term I interned at the Cape Eleuthera Institute (CEI) located on the Island of Eleuthera in the Bahamas. At CEI the main project that I was involved in focused on juvenile bonefish and the habitats that they utilize post settlement as a part of CEI’s Flats Ecology and Conservation Program. Apart from the juvenile bonefish study, I was a co-advisor for the Island School summer term flats research class. I taught the Island School students about the importance of flats environments with an emphasis bonefish ecology and conservation. With the Island School students and various other local and visiting groups, one of my main goals during the summer was to get students out on the water and have them actively seek bonefish for capture either by flyfishing or seine netting. Once mature fish were captured they would be tagged so to track their movements and growth rates, in accordance with the Bonefish and Tarpon Trust’s (BTT) Bahamas initiative. Students also had the opportunity to meet and learn from seasoned bonefishing guides. • Diet • 88% comprised of invertebrates • Main food source is bivalves • Common shrimp • Swimming crabs • Snapping shrimp • Mud and Spider crabs • Mantis shrimp • Benthic worms • Snails • Polychaetes • Small fishes Methods We used two distinct sampling approaches in our search for juvenile bonefish; exploratory qualitative sampling and systematic quantitative sampling. Collection methods included the use of beach seine nets, multimesh gill nets, cast nets, and fish traps. After our exploratory phase we concluded that the most effective sampling method was the 50ft. 0.25 inch mesh beach seine with no bag. Juvenile bonefish that were captured were catalogued and dissected in lab. The otoliths and stomachs were removed for analysis and fin clips were taken for dna analysis. • Catch Locations • 3 sheltered embayment's that had easy access to the open ocean. • 1 open beach • Conclusions • Habitat? • Large, sheltered embayments (East & West sides of Eleuthera) • Relatively shallow water (1/2 - 3 ft) • Fine Sand/Silt Mud (feeding/protection?) • Proximity to mangroves (related to fine sediment?) • Co-occuring with mottled mojarra • Social mimicry (protection)? • Mutually beneficial? • Shared muds for protection • Increase foraging effectiveness Acknowledgements: Chris Haak (UMass), Luke Griffin (College of Charleston), Aaron Shultz (CEI), Dr. Andy Danylchuk (UMass) and Dr. Aaron Adams (BTT)