WIOMSA-CORDIO spawning book Full Doc 10 oct 13.pdf

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Fig. 1. Composition (by number) of fish catches by (a) family and (b) species at Msambweni landing site, March2009 - March 2010 (n= 16,217 individual fish). Families and species whose catch composition was less than 1% werecombined and categorised as “others”.Spatio-temporal distribution of catches and fishing effort for S. sutorCreel survey data, aggregated across the year, identified that fishers from Msambweni fished at 17different fishing grounds, with 10 fishing grounds accounting for the majority of catches. Detailsof fishing ground name and location are not fully reported here for confidentiality reasons. Baskettraps and hook and line catch rates showed similar spatial patterns with the highest catch rates16
ecorded from inshore close to the coastline of Msambweni just south of the Mkunguni landingsite and around Chale Island (Figure 3a,b). Both these areas are dominated by seagrass beds withsome patches of corals (MS pers. obs.). Catches were also recorded from site A, B and C, thepresumed spawning aggregation sites (Figure 3), which comprised offshore coral patch reefs aroundTable 2. Msambweni fishery statistics showing fishing duration by gear; catch proportions (% by numbers of individualfish, n = 16,257) by gear for all species combined and for S. sutor alone (n = 6,200); and catch rates (mean ±SECPUE) by gear. All data are from creel surveys except CPUE for S. sutor which was derived from fishers’ recall.Fishing gearFishing duration(hrs)Catch proportions (%)CPUE(kg/fisher/trip)All spp. S. sutor All spp. S. sutorBasket trap 4.90 ± 0.05 29.2 51.0 3.7 ± 0.16 2.3Gillnet 6.85 ± 0.11 34.6 26.0 4.6 ± 0.25 -Hook & line 6.83 ± 0.05 33.2 22.1 3.4 ± 0.11 2.1Speargun 5.65 ± 0.13 3.0 0.8 3.4 ± 0.15 -All gears 100 38.2 3.7 ± 0.08 -8-12 m in depth surrounded by a gently sloping soft substrate of sand, rubble and seagrass bedswhich are further described in Chapter 5. Siganidae comprised more than 40% of fish by numberin catches from 5 fishing grounds: Msingini (91%), Site B (64%), Site C (60%), Chale (51%) andsite A (47%) (Figure 3c), though relative differences in total catch between sites were large with lownumbers of fish taken from site B.Fig. 2. Fishers recall of highest (solid lines) and lowest (dashed lines) (mean±SE) catch rates of S. sutor from basket trap(BT, open squares) and hook and line (HL, filled triangles) over the last 20 yrs.Seasonal changes in the location of fishing reflected in catch rates of siganids were evident with thehighest CPUE recorded from offshore fishing sites during the presumed spawning season whereasduring the non-spawning season the highest catch rates were recorded inshore (Figure 4).17
Page 4: The designation of geographical ent
Page 9: Chapter 1: IntroductionJan Robinson
Page 12 and 13: limited, subsistence levels of expl
Page 14: NTRs for spawning aggregations usin
Page 17 and 18: al. 2003). Verification may include
Page 19 and 20: a fraction of spawning sites are pr
Page 21 and 22: Chapter 3: Targeted fishing of the
Page 23: verifying spawning aggregations, we
Page 27 and 28: (a)(b)Fig. 3. Spatial patterns ofca
Page 30 and 31: pooled sizes of the three spawning
Page 32 and 33: found S. sutor contributed up to 44
Page 34 and 35: 2011b). However, observations of fi
Page 36 and 37: MethodsTo identify seasonal and lun
Page 38 and 39: n=199Females GSI (mean ± SE)2.521.
Page 40 and 41: The estimate of size at maturity in
Page 42 and 43: This study was designed to verify S
Page 44 and 45: were selected. Fish selected for ta
Page 46 and 47: The number of traps increased on th
Page 48 and 49: Of the 9 tagged fish detected by re
Page 50 and 51: Fig. 7. Diel patterns ofdetection f
Page 52 and 53: Spawning aggregation site fidelity
Page 54 and 55: Chapter 6: Shoemaker spinefoot rabb
Page 56 and 57: anterior of the anus and below the
Page 58 and 59: A high percentage (80.8%) of depart
Page 60 and 61: arrivals and departures at these tw
Page 62 and 63: are typically applied for reef fish
Page 64 and 65: (a)(b)(c)Chapter 3, Figure 3. Spati
Page 66 and 67: (1)(2)(3)(4)(5)(6)Chapter 7, Table
Page 68 and 69: Chapter 12, Fig. 1 Fraction of fema
Page 70 and 71: Plates 8. Selected photographs from
Page 72 and 73: MethodsStudy sitesThe study area wa
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which shelved gently ( ca. 25 o ) t
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Fig. 4. Lunar periodicity in number
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Behaviour and appearanceDescription
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eported aggregations forming betwee
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The sizes of E. fuscoguttatus aggre
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Materials and methodsStudy area and
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TL. All fish tagged were considered
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Lunar timing of arrivals and depart
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Fig. 8. The presence and absence of
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aggregation fishing. This critical
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Chapter 9: Persistence of grouper (
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ResultsBetween 2003 and 2006, the c
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Fig. 2. Mean (± standard error, SE
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A few species (e.g. Epinephelus gut
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(a)(b)Fig. 1. Map of (a) study site
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Fig. 2. Number of E. lanceolatus ob
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was having any impact on the popula
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A spawning aggregation is said to o
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Chapter 11: Evaluation of an indica
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Table 1 Aggregation fisheries asses
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the lists of Jennings et al. (1999)
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with the more vulnerable labrids an
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The remaining serranid populations
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Spawning aggregation behaviour is c
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tiger grouper, Mycteroperca tigris:
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of protecting the normal residence
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• Since grouper males are afforde
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Fig. 2 Yield-per-recruit normalized
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The approaches identified above are
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during full moon periods. Siganus s
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model, many parameter estimates are
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ReferencesAbunge C (2011) Managing
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Cox DR (1972) Regression models and
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Grüss A, Kaplan DM, Hart DR (2011b
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Kaunda-Arara B, Rose GA (2004a) Eff
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Newcomer RT, Taylor DH, Guttman SI
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Sancho G, Petersen CW, Lobel PS (20
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Appendix 1. QuestionnaireMASMA SPAW
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8. Spawning aggregation knowledgeUs
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Example items KSh Furthest site Clo
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Appendix II. Experimental testing o
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Clove oil concentrationAt a concent
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Appendix III. Application of acoust
Page 161 and 162:
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