elasmo_analyses/docs/schema_proposals/gear_proposal.html at main · SimonDedman/elasmo_analyses · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="" xml:lang="">
<head>
  <meta charset="utf-8" />
  <meta name="generator" content="pandoc" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes" />
  <title>gear_proposal</title>
  <style>
    code{white-space: pre-wrap;}
    span.smallcaps{font-variant: small-caps;}
    div.columns{display: flex; gap: min(4vw, 1.5em);}
    div.column{flex: auto; overflow-x: auto;}
    div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
    /* The extra [class] is a hack that increases specificity enough to
       override a similar rule in reveal.js */
    ul.task-list[class]{list-style: none;}
    ul.task-list li input[type="checkbox"] {
      font-size: inherit;
      width: 0.8em;
      margin: 0 0.8em 0.2em -1.6em;
      vertical-align: middle;
    }
    .display.math{display: block; text-align: center; margin: 0.5rem auto;}
  </style>
  <link rel="stylesheet" href="pandoc.css" />
</head>
<body>
<header id="title-block-header">
<h1 class="title">gear_proposal</h1>
</header>
<h1 id="proposed-schema-fishing-gear-type">Proposed Schema: Fishing Gear
Type</h1>
<p><strong>Status:</strong> Draft for team discussion <strong>Column
prefix:</strong> <code>gear_</code> <strong>Source:</strong> David Ruiz
Garcia’s reference paper (Issue #2), FAO gear classification, ICES
terminology</p>
<h2 id="purpose">Purpose</h2>
<p>Classify papers mentioning specific fishing gear types. Enables
analyses like “which gear types are most studied in bycatch research?”
or “are there geographic biases in gear-type research?”</p>
<h2 id="proposed-categories">Proposed Categories</h2>
<h3 id="level-1-gear-family">Level 1: Gear Family</h3>
<table>
<colgroup>
<col style="width: 28%" />
<col style="width: 25%" />
<col style="width: 46%" />
</colgroup>
<thead>
<tr class="header">
<th>Column</th>
<th>Label</th>
<th>Search Terms</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><code>gear_longline</code></td>
<td>Longline</td>
<td>longline, long-line, pelagic longline, demersal longline, bottom
longline</td>
</tr>
<tr class="even">
<td><code>gear_gillnet</code></td>
<td>Gillnet/Entanglement</td>
<td>gillnet, gill net, trammel net, entangling net, drift net,
driftnet</td>
</tr>
<tr class="odd">
<td><code>gear_trawl</code></td>
<td>Trawl</td>
<td>trawl, bottom trawl, demersal trawl, pelagic trawl, otter trawl,
beam trawl, shrimp trawl</td>
</tr>
<tr class="even">
<td><code>gear_purse_seine</code></td>
<td>Purse Seine</td>
<td>purse seine, purse-seine, ring net</td>
</tr>
<tr class="odd">
<td><code>gear_seine</code></td>
<td>Beach/Danish Seine</td>
<td>beach seine, Danish seine, seine net</td>
</tr>
<tr class="even">
<td><code>gear_hook_line</code></td>
<td>Hook and Line (non-longline)</td>
<td>hook and line, handline, rod and reel, trolling, jigging, pole and
line</td>
</tr>
<tr class="odd">
<td><code>gear_trap</code></td>
<td>Trap/Pot</td>
<td>trap, pot, fish trap, drumline, SMART drumline</td>
</tr>
<tr class="even">
<td><code>gear_net_other</code></td>
<td>Other Nets</td>
<td>cast net, lift net, scoop net, fyke net, pound net, weir</td>
</tr>
<tr class="odd">
<td><code>gear_harpoon</code></td>
<td>Harpoon/Spear</td>
<td>harpoon, spearfish*, spear gun</td>
</tr>
<tr class="even">
<td><code>gear_survey</code></td>
<td>Scientific Survey Gear</td>
<td>research vessel, survey trawl, BRUVs, longline survey,
fishery-independent survey, drone survey, UAV survey, ROV,
submersible</td>
</tr>
</tbody>
</table>
<h3 id="level-2-gear-modifiers-optional-where-stated">Level 2: Gear
Modifiers (optional, where stated)</h3>
<table>
<colgroup>
<col style="width: 28%" />
<col style="width: 25%" />
<col style="width: 46%" />
</colgroup>
<thead>
<tr class="header">
<th>Column</th>
<th>Label</th>
<th>Search Terms</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><code>gear_pelagic</code></td>
<td>Pelagic Gear</td>
<td>pelagic longline, pelagic trawl, midwater trawl</td>
</tr>
<tr class="even">
<td><code>gear_demersal</code></td>
<td>Demersal Gear</td>
<td>demersal longline, bottom trawl, demersal trawl, bottom
longline</td>
</tr>
<tr class="odd">
<td><code>gear_artisanal</code></td>
<td>Artisanal/Traditional</td>
<td>artisanal, traditional gear, small-scale, hand-operated</td>
</tr>
</tbody>
</table>
<h3 id="target-species-text-column-not-binary">Target Species (text
column, not binary)</h3>
<table>
<colgroup>
<col style="width: 29%" />
<col style="width: 22%" />
<col style="width: 48%" />
</colgroup>
<thead>
<tr class="header">
<th>Column</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><code>gear_target_species</code></td>
<td>text</td>
<td>Target species group of the fishery, e.g., “tuna”, “swordfish”,
“shrimp”, “shark”, “mixed demersal”. Free text extracted from paper;
standardised during analysis.</td>
</tr>
</tbody>
</table>
<h3 id="mitigation-devices-relevant-to-bycatch-research">Mitigation
Devices (relevant to bycatch research)</h3>
<table>
<colgroup>
<col style="width: 28%" />
<col style="width: 25%" />
<col style="width: 46%" />
</colgroup>
<thead>
<tr class="header">
<th>Column</th>
<th>Label</th>
<th>Search Terms</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><code>gear_mit_circle_hook</code></td>
<td>Circle Hooks</td>
<td>circle hook, non-offset hook</td>
</tr>
<tr class="even">
<td><code>gear_mit_brd</code></td>
<td>Bycatch Reduction Device</td>
<td>bycatch reduction device, BRD, turtle excluder, TED</td>
</tr>
<tr class="odd">
<td><code>gear_mit_deterrent</code></td>
<td>Shark Deterrent</td>
<td>shark deterrent, SharkGuard, shark guard, electropositive, Rare
Earth, EPM, LED deterrent, magnetic deterrent</td>
</tr>
<tr class="even">
<td><code>gear_mit_time_area</code></td>
<td>Time-Area Closure</td>
<td>time-area closure, spatial closure, fishing closure, seasonal
closure, MPA</td>
</tr>
<tr class="odd">
<td><code>gear_mit_handling</code></td>
<td>Handling/Release</td>
<td>safe release, handling practice*, live release, post-release
mortality, PRM</td>
</tr>
</tbody>
</table>
<p><strong>Note:</strong> Shark deterrents (previously split across
<code>gear_mit_brd</code> and <code>gear_mit_led</code>) are
consolidated under <code>gear_mit_deterrent</code>. Deterrents are a
subset of bycatch reduction approaches but are distinct enough in the
literature to warrant their own column. BRDs retain the physical device
meaning (TEDs, grids, escape panels).</p>
<h2 id="resolved-discussion-points">Resolved Discussion Points</h2>
<ol type="1">
<li><strong>Level 2 vs separate columns:</strong> Keep separate.
Pelagic/demersal modifiers add gear-specific context that eco_ columns
don’t capture (a paper might study pelagic habitat but discuss demersal
gear).</li>
<li><strong>Mitigation as sub-category:</strong> Keep here under gear.
They are gear modifications.</li>
<li><strong>Survey gear vs techniques:</strong> Keep separate schema.
See Gear-Technique Comparison table (below) for where they overlap and
diverge.</li>
<li><strong>Target species:</strong> Added as free text column
<code>gear_target_species</code> rather than splitting gear into
fishery-specific buckets. Allows “tuna longline” to be captured as
gear=longline + target=tuna.</li>
<li><strong>Coverage:</strong> Gear type is mainly relevant for FISH and
CON disciplines. ~40-50% of papers won’t mention gear at all.</li>
<li><strong>Drones in survey:</strong> Added drone survey, UAV survey,
ROV, submersible to <code>gear_survey</code>.</li>
</ol>
<h2 id="gear-vs.-technique-overlap-comparison">Gear vs. Technique
Overlap Comparison</h2>
<p>Some items appear in both the gear schema and the technique taxonomy.
This is intentional — they serve different analytical purposes.</p>
<table>
<colgroup>
<col style="width: 9%" />
<col style="width: 24%" />
<col style="width: 35%" />
<col style="width: 30%" />
</colgroup>
<thead>
<tr class="header">
<th>Item</th>
<th>In Gear Schema</th>
<th>In Technique Taxonomy</th>
<th>Rationale for Both</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>BRUVs</td>
<td><code>gear_survey</code></td>
<td><code>a_bruvs</code> (MOV)</td>
<td>Gear: what equipment was deployed. Technique: the analytical method
used.</td>
</tr>
<tr class="even">
<td>Longline survey</td>
<td><code>gear_survey</code></td>
<td><code>a_longline_survey</code> (FISH)</td>
<td>Gear: the physical gear. Technique: the standardised sampling
design.</td>
</tr>
<tr class="odd">
<td>Acoustic telemetry</td>
<td>No</td>
<td><code>a_acoustic_telemetry</code> (MOV)</td>
<td>Technique only — not a fishing gear.</td>
</tr>
<tr class="even">
<td>Satellite telemetry</td>
<td>No</td>
<td><code>a_satellite_telemetry</code> (MOV)</td>
<td>Technique only — not a fishing gear.</td>
</tr>
<tr class="odd">
<td>Trawl</td>
<td><code>gear_trawl</code></td>
<td><code>a_trawl_survey</code> (FISH)</td>
<td>Gear: commercial/survey trawl. Technique: when used as standardised
survey method.</td>
</tr>
<tr class="even">
<td>Drone</td>
<td><code>gear_survey</code></td>
<td><code>a_drone_survey</code> (BEH)</td>
<td>Gear: the survey platform. Technique: the observation/analysis
method.</td>
</tr>
<tr class="odd">
<td>Circle hooks</td>
<td><code>gear_mit_circle_hook</code></td>
<td>No</td>
<td>Gear only — a gear modification, not an analytical technique.</td>
</tr>
<tr class="even">
<td>Stable isotopes</td>
<td>No</td>
<td><code>a_stable_isotopes</code> (TRO)</td>
<td>Technique only — not a gear type.</td>
</tr>
<tr class="odd">
<td>Mark-recapture</td>
<td>No</td>
<td><code>a_mark_recapture</code> (BIO)</td>
<td>Technique only — the tagging gear is incidental.</td>
</tr>
<tr class="even">
<td>Genetics/eDNA</td>
<td>No</td>
<td><code>a_edna</code> (GEN)</td>
<td>Technique only — sampling gear is incidental.</td>
</tr>
</tbody>
</table>
<p><strong>Principle:</strong> Gear describes <em>what physical
equipment was used in the water</em>. Technique describes <em>what
analytical method was applied to the data</em>. A paper can use longline
gear and apply CPUE standardisation technique to the resulting data.</p>
<hr />
<p><em>Draft created: 2026-03-10, revised with team feedback</em></p>
</body>
</html>