Demographics of American Eel Collected in the Commercial Weir Fishery in the Upper Delaware River, NY. Jessica Best and Sheila Eyler
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1 1 Demographics of American Eel Collected in the Commercial Weir Fishery in the Upper Delaware River, NY Jessica Best and Sheila Eyler
2 2 Background: Eel weirs - historic fishery Mostly harvested for food Timeframe Construction begins in June Fishing: late August-October/November
3 3 Commercial Weir Fishery Species managed by Atlantic States Marine Fisheries Commission (ASMFC) Daily catches reported monthly to NY State Catches monitored by NYS DEC 2015 license cap 9 licenses 6 weirs on Delaware River 3 weirs on Neversink River (tributary)
4 4 Delaware River New York Watershed Pennsylvania Maryland New Jersey
5 5 Delaware River New York Watershed Pennsylvania Maryland New Jersey
6 6 Delaware River Watershed New York Pennsylvania
7 7 Delaware River Watershed New York Pennsylvania
8 Eel Weir 8
9 Eel Weir 9
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11 Eel Weir 11
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19 19 Study Background ASMFC stricter management of eel harvest, research needs Only directed silver eel fishery on east coast Longest un-dammed river east of Mississippi Initial assessment of fishery left uncertainty with regard to assumption of all silver and all female
20 20 Study Objectives Silver? Gender? Demographics? (Size, prevalence of a. crassus, etc.)
21 21 Field collections 4 sample sites Target: eels per sample 3 samples per location throughout season Total of 327 samples
22 22 Study Area New York Pennsylvania
23 23 Study Area New York Pennsylvania
24 24 Weir ID New York Pennsylvania
25 25 Lab data collection Length Weight Left and right eye vertical and horizontal diameters (Pankhurst eye index-pei) Left and right fin length (Pelvic fin index-pfi) Description of color/attributes Photo Sex determination Stomach examination Swim bladder parasite count Gonad weight (gonadosomatic index-gsi) Stomach weight Otolith removal for age analysis
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29 29 Results 327 eels examined: 310 female, 17 male Female: mean length=557 mm, mean weight=341.0 g Male: mean length=370 mm, mean weight=88.2 g
30 30 Average swimbladder parasite count: Female: 4.1 (max 40) Male: 2.7 (max 10) Results
31 31 Average gut weight: Female g Male g Results Stomach contents: 97% of stomachs were empty* 3 - fish 3 - unidentifiable organic contents 1 - a stick 1 rubber fishing lure *Varying holding times
32 32 Seasonal Variation (Female) TL - No sig. change throughout season GSI - Early season sig. less than mid and late season PEI - Early season sig. less than mid and late season
33 33 Location Variation (Female) TL no sig. change between sites GSI sites 2 & 3 similar (higher GSI) PEI site 2 was different (higher) than 3 and 4, which were similar
34 34 Summary 95% female 5% male Females not very advanced in maturity Yellow eels rare Females not consistently large Some eels with a low GSI, had high PEI and Pectoral Fin Index values. The converse was also true
35 35 Conclusions Silver? Yes? Female? Mostly Demographics? Still puzzling
36 36 What s next? Age otoliths and establish age structure of silver eel fishery Further examine temporal and/or geographical relationships Repeat study
37 37 Thank You Special Thanks to: Mo Grassi, Cornell University/NYS DEC USFWS: Josh Newhard, Dan Drake NYS DEC: Carol Hoffman, Gregg Kenney, Grace Ballou, Jesse Hornstein, Kyle Martin, Robert Adams, Russell Berdan, Sarah Mount, Trevor Foxwell, Wes Eakin, Zachary Schuller Cooperative weir operators
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